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  1. Book ; Online: Frustration-Mediated Crossover from Long-Range to Short-Range Magnetic Ordering in $\mathbf{Y_{1-x}Lu_xBaCo_4O_7} $

    Sahinbay, Sevda / Zheng, Hong / Mitchell, John F. / Rosenkranz, Stephan / Chmaissem, Omar

    2023  

    Abstract: We present a comprehensive magnetic and structural phase diagram for $\mathrm{Y_{1-x}Lu_xBaCo_4O_7}$, established through neutron diffraction and magnetization measurements. Our results outline the evolution of various nuclear structures, encompassing ... ...

    Abstract We present a comprehensive magnetic and structural phase diagram for $\mathrm{Y_{1-x}Lu_xBaCo_4O_7}$, established through neutron diffraction and magnetization measurements. Our results outline the evolution of various nuclear structures, encompassing both orthorhombic and monoclinic symmetries, in response to changes in composition and temperature. The phase transition temperature of the orthorhombic phase, $T_{s1}$, decreases with increasing Lu content from 310 K for x = 0.0 to 110 K for x = 1.0. In Lu-rich compositions (0.7 \le x \le 1.0), first-order structural transitions are observed with coexisting and competing orthorhombic Pbn$2_1$ and metastable monoclinic Cc phases. Composition- and temperature-dependent refinements of the magnetic structure reveal an antiferromagnetic arrangement of Co spin pairs, below the magnetic transition temperatures of the Y-rich compositions, in the ab plane within both the triangular and Kagom\'e layers. A gradual suppression of long-range magnetic order is observed with increasing the Lu content, accompanied by the development of short-range magnetic correlations present in all the samples.
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2023-12-07
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book ; Online: Two-Dimensional Short-Range Chemical Ordering in Ba1-xNaxFe2As2

    Stadel, R. / DeRose, R. / Taddei, K. M. / Krogstad, M. J. / Upreti, P. / Islam, Z. / Phelan, D. / Chung, D. Y. / Osborn, R. / Rosenkranz, S. / Chmaissem, O.

    2023  

    Abstract: A true understanding of the properties of pnictide superconductors require the development of high-quality materials and performing measurements designed to unravel their intrinsic properties and short-range nematic correlations which are often obscured ... ...

    Abstract A true understanding of the properties of pnictide superconductors require the development of high-quality materials and performing measurements designed to unravel their intrinsic properties and short-range nematic correlations which are often obscured by extrinsic effects such as poor crystallinity, inhomogeneity, domain formation and twinning. In this paper, we report the systematic growth of high-quality Na-substituted BaFe2As2 single crystals and their characterization using pulsed-magnetic fields x-ray diffraction and x-ray diffuse scattering. Analysis of the properties and compositions of the highest quality crystals show that their actual Na stoichiometry is about 50-60% of the nominal content and that the targeted production of crystals with specific compositions is accessible. We derived a reliable equation to estimate the Na stoichiometry based on the measured superconducting TC of these materials. Attempting to force spin reorientation and induce tetragonality, orthorhombic Ba1-xNaxFe2As2 single crystals subjected to out-of-plane magnetic fields up to 31.4T are found to exhibit strong in-plane magnetic anisotropy demonstrated by the insufficiency of such high fields in manipulating the relative population of their twinned domains or in suppressing the orthorhombic order. Broad x-ray diffuse intensity rods observed at temperatures between 30 K and 300 K uncover short-range structural correlations. Local structure modeling together with 3D-{\Delta}PDF mapping of real-space interatomic vectors show that the diffuse scattering arises from in-plane short-range chemical correlations of the Ba and Na atoms coupled with short-range atomic displacements within the same plane due to an effective size difference between the two atomic species.
    Keywords Condensed Matter - Superconductivity ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2023-04-16
    Publishing country us
    Document type Book ; Online
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  3. Article ; Online: Order-Disorder Transitions in (Ca_{x}Sr_{1-x})_{3}Rh_{4}Sn_{13}.

    Upreti, Puspa / Krogstad, Matthew / Haley, Charlotte / Anitescu, Mihai / Rao, Vishwas / Poudel, Lekh / Chmaissem, Omar / Rosenkranz, Stephan / Osborn, Raymond

    Physical review letters

    2022  Volume 128, Issue 9, Page(s) 95701

    Abstract: The classification of structural phase transitions as displacive or order-disorder in character is usually based on spectroscopic data above the transition. We use single crystal x-ray diffraction to investigate structural correlations in the ... ...

    Abstract The classification of structural phase transitions as displacive or order-disorder in character is usually based on spectroscopic data above the transition. We use single crystal x-ray diffraction to investigate structural correlations in the quasiskutterudites, (Ca_{x}Sr_{1-x})_{3}Rh_{4}Sn_{13}, which have a quantum phase transition at x∼0.9. Three-dimensional pair distribution functions show that the amplitudes of local atomic displacements are temperature independent below the transition and persist to well above the transition, a signature of order-disorder behavior. The implications for the associated electronic transitions are discussed.
    Language English
    Publishing date 2022-03-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.128.095701
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Synthesis and characterization of bulk Nd

    Wang, Bi-Xia / Zheng, Hong / Krivyakina, E / Chmaissem, O / Lopes, Pietro Papa / Lynn, J W / Gallington, Leighanne C / Ren, Y / Rosenkranz, S / Mitchell, J F / Phelan, D

    Physical review materials

    2021  Volume 4, Issue 8

    Abstract: The recent reports of superconductivity in ... ...

    Abstract The recent reports of superconductivity in Nd
    Language English
    Publishing date 2021-04-21
    Publishing country United States
    Document type Journal Article
    ISSN 2475-9953
    ISSN 2475-9953
    DOI 10.1103/PhysRevMaterials.4.084409
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Book ; Online: Local atomic and magnetic structure of multiferroic (Sr,Ba)(Mn,Ti)O$_3$

    Jones, Braedon / Suggs, Christiana Z. / Krivyakina, Elena / Phelan, Daniel / Garlea, V. Ovidiu / Chmaissem, Omar / Frandsen, Benjamin A.

    2023  

    Abstract: We present a detailed study of the local atomic and magnetic structure of the type-I multiferroic perovskite system (Sr,Ba)(Mn,Ti)O$_3$ using x-ray and neutron pair distribution function (PDF) analysis, polarized neutron scattering, and muon spin ... ...

    Abstract We present a detailed study of the local atomic and magnetic structure of the type-I multiferroic perovskite system (Sr,Ba)(Mn,Ti)O$_3$ using x-ray and neutron pair distribution function (PDF) analysis, polarized neutron scattering, and muon spin relaxation ($\mu$SR) techniques. The atomic PDF analysis reveals widespread nanoscale tetragonal distortions of the crystal structure even in the paraelectric phase with average cubic symmetry, corresponding to incipient ferroelectricity in the local structure. Magnetic PDF analysis, polarized neutron scattering, and $\mu$SR likewise confirm the presence of short-range antiferromagnetic correlations in the paramagnetic state, which grow in magnitude as the temperature approaches the magnetic transition. We show that these short-range magnetic correlations coincide with a reduction of the tetragonal (i.e. ferroelectric) distortion in the average structure, suggesting that short-range magnetism can play an important role in magnetoelectric and/or magnetostructural phenomena even without genuine long-range magnetic order. The reduction of the tetragonal distortion scales linearly with the local magnetic order parameter, pointing to spontaneous linear magnetoelectric coupling in this system. These findings provide greater insight into the multiferroic properties of (Sr,Ba)(Mn,Ti)O$_3$ and demonstrate the importance of investigating the local atomic and magnetic structure to gain a deeper understanding of the intertwined degrees of freedom in multiferroics.
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2023-10-27
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Magnetic structure of Sr2CuWO6.

    Vasala, S / Avdeev, M / Danilkin, S / Chmaissem, O / Karppinen, M

    Journal of physics. Condensed matter : an Institute of Physics journal

    2014  Volume 26, Issue 49, Page(s) 496001

    Abstract: Magnetic structure of the double perovskite Sr2CuWO6 was determined from neutron powder diffraction data. At 3 K the material is magnetically long-range ordered into a collinear antiferromagnetic structure described by a propagation vector k = (0, 1/2, 1/ ...

    Abstract Magnetic structure of the double perovskite Sr2CuWO6 was determined from neutron powder diffraction data. At 3 K the material is magnetically long-range ordered into a collinear antiferromagnetic structure described by a propagation vector k = (0, 1/2, 1/2) with the Cu(II) moments of 0.57(1) μB parallel to the a-axis. The result is in agreement with our previous prediction (Vasala et al 2014 Phys. Rev. B 89 134419) based on electronic structure calculations, showing that the three-dimensional magnetic long-range order is caused by relatively strong antiferromagnetic next-nearest-neighbor interactions.
    Language English
    Publishing date 2014-12-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/0953-8984/26/49/496001
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  7. Book ; Online: Order-Disorder Transitions in (Ca$_x$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$

    Upreti, Puspa / Krogstad, Matthew / Haley, Charlotte / Anitescu, Mihai / Rao, Vishwas / Poudel, Lekh / Chmaissem, Omar / Rosenkranz, Stephan / Osborn, Raymond

    2022  

    Abstract: The classification of structural phase transitions as displacive or order-disorder in character is usually based on spectroscopic data above the transition. We use single crystal x-ray diffraction to investigate structural correlations in the quasi- ... ...

    Abstract The classification of structural phase transitions as displacive or order-disorder in character is usually based on spectroscopic data above the transition. We use single crystal x-ray diffraction to investigate structural correlations in the quasi-skutterudites, (Ca$_x$Sr$_{1-x}$)$_3$Rh$_4$Sn$_{13}$, which have a quantum phase transition at $x\sim0.9$. Three-dimensional pair distribution functions show that the amplitudes of local atomic displacements are temperature-independent below the transition and persist to well above the transition, a signature of order-disorder behavior. The implications for the associated electronic transitions are discussed.

    Comment: 5 pages, 4 figures
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Publishing date 2022-05-04
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Book ; Online: Synthesis and characterization of bulk Nd1-xSrxNiO2 and Nd1-xSrxNiO3

    Wang, Bi-Xia / Zheng, Hong / Krivyakina, E. / Chmaissem, O. / Lopes, Pietro Papa / Lynn, J. W. / Gallington, Leighanne C. / Ren, Y. / Rosenkranz, S. / Mitchell, J. F. / Phelan, D.

    2020  

    Abstract: The recent reports of superconductivity in Nd1-xSrxNiO2/SrTiO3 heterostructures have reinvigorated interest in potential superconductivity of low-valence nickelates. Synthesis of Ni1+-containing compounds is notoriously difficult. In the current work, a ... ...

    Abstract The recent reports of superconductivity in Nd1-xSrxNiO2/SrTiO3 heterostructures have reinvigorated interest in potential superconductivity of low-valence nickelates. Synthesis of Ni1+-containing compounds is notoriously difficult. In the current work, a combined sol-gel combustion and high-pressure annealing technique was employed to prepare polycrystalline perovskite Nd1-xSrxNiO3 (x = 0, 0.1 and 0.2). Metal nitrates and metal acetates were used as starting materials, and the latter were found to be superior to the former in terms of safety and reactivity. The Nd1-xSrxNiO3 compounds were subsequently reduced to Nd1 xSrxNiO2 using calcium hydride in a sealed, evacuated quartz tube. To understand the synthesis pathway, the evolution from NdNiO3 to NdNiO2 was monitored using in-situ synchrotron X ray diffraction during the reduction process. Electrical transport properties were consistent with an insulator-metal transition occurring between x = 0 and 0.1 for Nd1-xSrxNiO3. Superconductivity was not observed in our bulk samples of Nd1-xSrxNiO2. Neutron diffraction experiments at 3 K and 300 K were performed on Nd0.9Sr0.1NiO2, in which no magnetic Bragg reflections were observed, and the results of structural Rietveld refinement are provided.

    Comment: 8 pages, 8 figures
    Keywords Condensed Matter - Materials Science
    Subject code 540
    Publishing date 2020-06-16
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article: The relation of local order to material properties in relaxor ferroelectrics.

    Krogstad, M J / Gehring, P M / Rosenkranz, S / Osborn, R / Ye, F / Liu, Y / Ruff, J P C / Chen, W / Wozniak, J M / Luo, H / Chmaissem, O / Ye, Z-G / Phelan, D

    Nature materials

    2018  Volume 17, Issue 8, Page(s) 718–724

    Abstract: Correlating electromechanical and dielectric properties with nanometre-scale order is the defining challenge for the development of piezoelectric oxides. Current lead (Pb)-based relaxor ferroelectrics can serve as model systems with which to unravel ... ...

    Abstract Correlating electromechanical and dielectric properties with nanometre-scale order is the defining challenge for the development of piezoelectric oxides. Current lead (Pb)-based relaxor ferroelectrics can serve as model systems with which to unravel these correlations, but the nature of the local order and its relation to material properties remains controversial. Here we employ recent advances in diffuse scattering instrumentation to investigate crystals that span the phase diagram of PbMg
    Language English
    Publishing date 2018-06-25
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2088679-2
    ISSN 1476-4660 ; 1476-1122
    ISSN (online) 1476-4660
    ISSN 1476-1122
    DOI 10.1038/s41563-018-0112-7
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  10. Book ; Online: Spin and charge density waves in the quasi-one-dimensional KMn6Bi5

    Bao, Jin-Ke / Cao, Huibo / Krogstad, Matthew J. / Taddei, Keith M. / Shi, Chenfei / Cao, Shixun / Lapidus, Saul H. / van Smaalen, Sander / Chung, Duck Young / Kanatzidis, Mercouri G. / Rosenkranz, Stephan / Chmaissem, Omar

    2022  

    Abstract: AMn6Bi5 materials (A = Na, K, Rb and Cs) consisting of unique Mn-cluster chains emerge as a new family of superconductors with the suppression of their antiferromagnetic (AFM) order under high pressures. Here, we report transverse incommensurate spin ... ...

    Abstract AMn6Bi5 materials (A = Na, K, Rb and Cs) consisting of unique Mn-cluster chains emerge as a new family of superconductors with the suppression of their antiferromagnetic (AFM) order under high pressures. Here, we report transverse incommensurate spin density waves (SDWs) for the Mn atoms with a propagating direction along the chain axes as a ground state for KMn6Bi5 by single crystal neutron diffraction. The SDWs have a refined amplitude of ~2.46 Bohr magnetons for the Mn atoms in the pentagons and ~0.29 Bohr magnetons with a large standard deviation for Mn atoms in the center between the pentagons. AFM dominate both the nearest-neighbor Mn-Mn interactions within the pentagon and next-nearest-neighbor Mn-Mn interactions out of the pentagon (along the propagating wave). The SDWs exhibit both local and itinerant characteristics probably formed by a cooperative interaction between local magnetic exchange and conduction electrons. A significant magnetoelastic effect during the AFM transition, especially along the chain direction, has been demonstrated by temperature-dependent x-ray powder diffraction. Single crystal x-ray diffraction below the AFM transition revealed satellite peaks originating from charge density waves along the chain direction with a q-vector twice as large as the SDW one, pointing to a strong real space coupling between them. Our work not only manifests a fascinating interplay among spin, charge, lattice and one dimensionality to trigger intertwined orders in KMn6Bi5 but also provides important piece of information for the magnetic structure of the parent compound to understand the mechanism of superconductivity in this new family.
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science ; Condensed Matter - Superconductivity
    Subject code 530
    Publishing date 2022-08-04
    Publishing country us
    Document type Book ; Online
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