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  1. Article ; Online: Experimental and theoretical thermodynamic studies in Ba

    Pásztorová, Jana / Mansouri Tehrani, Aria / Živković, Ivica / Spaldin, Nicola A / Rønnow, Henrik M

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

    2023  Volume 35, Issue 24

    Abstract: We address the degeneracy of the ground state multiplet on the ... ...

    Abstract We address the degeneracy of the ground state multiplet on the 5
    Language English
    Publishing date 2023-03-31
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/acc62a
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  2. Article ; Online: Bespoke open databases would be cheaper and easier to analyse.

    Obwegeser, Nikolaus / Rønnow, Henrik M / Yokoi, Tomoko

    Nature

    2021  Volume 596, Issue 7872, Page(s) 343

    MeSH term(s) Data Analysis ; Databases, Factual/economics ; Databases, Factual/supply & distribution ; Information Dissemination/methods ; Motivation ; Synchrotrons ; Wildfires/statistics & numerical data
    Language English
    Publishing date 2021-08-17
    Publishing country England
    Document type Letter
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/d41586-021-02234-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 26: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MG 9: Show issues
    Zs.MO 244: Show issues

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  3. Article ; Online: Electric field writing and erasing of skyrmions in magnetoelectric Cu

    Huang, Ping / Cantoni, Marco / Magrez, Arnaud / Carbone, Fabrizio / Rønnow, Henrik M

    Nanoscale

    2022  Volume 14, Issue 44, Page(s) 16655–16660

    Abstract: Skyrmions are chiral magnetic textures with non-trivial topology, and due to their unique properties they are widely considered as promising information carriers in novel magnetic storage applications. While electric field writing/erasing and ... ...

    Abstract Skyrmions are chiral magnetic textures with non-trivial topology, and due to their unique properties they are widely considered as promising information carriers in novel magnetic storage applications. While electric field writing/erasing and manipulation of skyrmions have been recently achieved, quantitative insights into the energetics of those phenomena remain scarce. Here, we report our
    Language English
    Publishing date 2022-11-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 2515664-0
    ISSN 2040-3372 ; 2040-3364
    ISSN (online) 2040-3372
    ISSN 2040-3364
    DOI 10.1039/d2nr04399h
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  4. Article ; Online: Understanding unconventional magnetic order in a candidate axion insulator by resonant elastic x-ray scattering.

    Soh, Jian-Rui / Bombardi, Alessandro / Mila, Frédéric / Rahn, Marein C / Prabhakaran, Dharmalingam / Francoual, Sonia / Rønnow, Henrik M / Boothroyd, Andrew T

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 3387

    Abstract: Magnetic topological insulators and semimetals are a class of crystalline solids whose properties are strongly influenced by the coupling between non-trivial electronic topology and magnetic spin configurations. Such materials can host exotic ... ...

    Abstract Magnetic topological insulators and semimetals are a class of crystalline solids whose properties are strongly influenced by the coupling between non-trivial electronic topology and magnetic spin configurations. Such materials can host exotic electromagnetic responses. Among these are topological insulators with certain types of antiferromagnetic order which are predicted to realize axion electrodynamics. Here we investigate the highly unusual helimagnetic phases recently reported in EuIn
    MeSH term(s) X-Rays ; Radiography ; Physical Phenomena ; Phase Transition ; Electronics
    Language English
    Publishing date 2023-06-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-39138-5
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  5. Book ; Online: Kapitza stabilization of quantum critical order

    Kuzmanovski, Dushko / Aeppli, Gabriel / Rønnow, Henrik M. / Balatsky, Alexander V.

    2022  

    Abstract: Dynamical perturbations modify the states of classical systems in surprising ways and give rise to important applications in science and technology. For example, Floquet engineering exploits the possibility of band formation in the frequency domain when ... ...

    Abstract Dynamical perturbations modify the states of classical systems in surprising ways and give rise to important applications in science and technology. For example, Floquet engineering exploits the possibility of band formation in the frequency domain when a strong, periodic variation is imposed on parameters such as spring constants. We describe here Kapitza engineering, where a drive field oscillating at a frequency much higher than the characteristic frequencies for the linear response of a system changes the potential energy surface so much that maxima found at equilibrium become local minima, in precise analogy to the celebrated Kapitza pendulum where the unstable inverted configuration, with the mass above rather than below the fulcrum, actually becomes stable. Our starting point is a quantum field theory of the Ginzburg-Devonshire type, suitable for many condensed matter systems, including particularly ferroelectrics and quantum paralectrics such as the common substrate (for oxide electronics) strontium titanate (SrTiO${}_{3}$). We show that an off-resonance oscillatory electric field generated by a laser-driven THz source can induce ferroelectric order in the quantum-critical limit. Heating effects are estimated to be manageable using pulsed radiation; ``hidden" radiation-induced order can persist to low temperatures without further pumping due to stabilization by strain. We suggest second-harmonic-generation, soft-mode-spectroscopy, and X-ray-diffraction experiments to characterize the induced order.

    Comment: 8+2 pages, 4+2 figures, submitted to Physical Review X
    Keywords Condensed Matter - Strongly Correlated Electrons ; Condensed Matter - Materials Science
    Subject code 539
    Publishing date 2022-08-19
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Book ; Online: Interplay between static and dynamic correlation in itinerant magnets -- a first principles study of magnons in MnBi

    Skovhus, Thorbjørn / Olsen, Thomas / Rønnow, Henrik M.

    2021  

    Abstract: We present first principles calculations of the dynamic susceptibility in strained and doped ferromagnetic MnBi using time-dependent density functional theory. In spite of being a metal, MnBi exhibits signatures of strong correlation and a proper ... ...

    Abstract We present first principles calculations of the dynamic susceptibility in strained and doped ferromagnetic MnBi using time-dependent density functional theory. In spite of being a metal, MnBi exhibits signatures of strong correlation and a proper description in the framework of density functional theory requires Hubbard corrections to the Mn $d$-orbitals. Here we develop a consistent rescaling of the exchange-correlation kernel that permits calculations of the dynamic susceptibility that includes Hubbard corrections without deteriorating the delicate balance between the magnon dispersion and the Stoner continuum. We find excellent agreement with the experimentally observed magnon dispersion for pristine MnBi and show that the material undergoes a phase transition to helical order under application of either doping or strain. The presented methodology pave the way for susceptibility calculations of a wide range of magnetic materials that require Hubbard corrections for a proper description of the ground state in the framework of density functional theory.

    Comment: 13 pages
    Keywords Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Subject code 541
    Publishing date 2021-10-14
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Book ; Online: Negative refractive index in dielectric crystals containing stoichiometric rare-earth ions

    Berrington, Matthew C. / Rønnow, Henrik M. / Sellars, Matthew J. / Ahlefeldt, Rose L.

    2022  

    Abstract: We investigate the prospect of achieving negative permittivity and permeability at optical frequencies in a dielectric crystal containing stoichiometric rare-earth ions. We derive the necessary transition linewidth, ion density and electric and magnetic ... ...

    Abstract We investigate the prospect of achieving negative permittivity and permeability at optical frequencies in a dielectric crystal containing stoichiometric rare-earth ions. We derive the necessary transition linewidth, ion density and electric and magnetic oscillator strengths using a simplified model of non-interacting dipoles. We identify Erbium crystals in a magnetically ordered phase as the most promising material to meet these conditions, and describe initial optical measurements of two potential candidates, \ercl{} and ${}^7$\lierf{}, which display linewidths of 3~GHz and 250~MHz, respectively. The properties of ${}^7$\lierf{} satisfied our criterion for negative permeability.
    Keywords Physics - Optics ; Condensed Matter - Materials Science
    Publishing date 2022-05-05
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Field-induced bound-state condensation and spin-nematic phase in SrCu

    Fogh, Ellen / Nayak, Mithilesh / Prokhnenko, Oleksandr / Bartkowiak, Maciej / Munakata, Koji / Soh, Jian-Rui / Turrini, Alexandra A / Zayed, Mohamed E / Pomjakushina, Ekaterina / Kageyama, Hiroshi / Nojiri, Hiroyuki / Kakurai, Kazuhisa / Normand, Bruce / Mila, Frédéric / Rønnow, Henrik M

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 442

    Abstract: In quantum magnetic materials, ordered phases induced by an applied magnetic field can be described as the Bose-Einstein condensation (BEC) of magnon excitations. In the strongly frustrated system ... ...

    Abstract In quantum magnetic materials, ordered phases induced by an applied magnetic field can be described as the Bose-Einstein condensation (BEC) of magnon excitations. In the strongly frustrated system SrCu
    Language English
    Publishing date 2024-01-10
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-44115-z
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  9. Article ; Online: High-resolution MHz time- and angle-resolved photoemission spectroscopy based on a tunable vacuum ultraviolet source.

    Hellbrück, Lukas / Puppin, Michele / Guo, Fei / Hickstein, Daniel D / Benhabib, Siham / Grioni, Marco / Dil, J Hugo / LaGrange, Thomas / Rønnow, Henrik M / Carbone, Fabrizio

    The Review of scientific instruments

    2024  Volume 95, Issue 3

    Abstract: The time- and angle-resolved photoemission spectroscopy (trARPES) allows for direct mapping of the electronic band structure and its dynamic response on femtosecond timescales. Here, we present a new ARPES system, powered by a new fiber-based femtosecond ...

    Abstract The time- and angle-resolved photoemission spectroscopy (trARPES) allows for direct mapping of the electronic band structure and its dynamic response on femtosecond timescales. Here, we present a new ARPES system, powered by a new fiber-based femtosecond light source in the vacuum ultraviolet range, accessing the complete first Brillouin zone for most materials. We present trARPES data on Au(111), polycrystalline Au, Bi2Se3, and TaTe2, demonstrating an energy resolution of 21 meV with a time resolution of <360 fs, at a high repetition rate of 1 MHz. The system is integrated with an extreme ultraviolet high harmonic generation beamline, enabling an excellent tunability of the time-bandwidth resolution.
    Language English
    Publishing date 2024-03-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/5.0179549
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    In stock of ZB MED Bonn / Germany

    Z 4' 46/112: Show issues

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  10. Article: Direct Visualisation of Skyrmion Lattice Defect Alignment at Grain Boundaries.

    Schönenberger, Thomas / Huang, Ping / Brun, Lawrence D / Guanghao, Li / Magrez, Arnaud / Carbone, Fabrizio / Rønnow, Henrik M

    Nanoscale research letters

    2022  Volume 17, Issue 1, Page(s) 20

    Abstract: We present a method to directly visualise a statistical analysis of skyrmion defect alignment at grain boundaries in the skyrmion host [Formula: see text] ... ...

    Abstract We present a method to directly visualise a statistical analysis of skyrmion defect alignment at grain boundaries in the skyrmion host [Formula: see text]OSeO
    Language English
    Publishing date 2022-01-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2253244-4
    ISSN 1556-276X ; 1931-7573
    ISSN (online) 1556-276X
    ISSN 1931-7573
    DOI 10.1186/s11671-022-03654-y
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