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  1. Article ; Online: Two-dimensional square and hexagonal oxide quasicrystal approximants in SrTiO

    Ruano Merchan, C / Dorini, T T / Brix, F / Pasquier, L / Jullien, M / Pierre, D / Andrieu, S / Dumesnil, K / Parapari, S S / Šturm, S / Ledieu, J / Sicot, M / Copie, O / Gaudry, E / Fournée, V

    Physical chemistry chemical physics : PCCP

    2022  Volume 24, Issue 12, Page(s) 7253–7263

    Abstract: The formation of two-dimensional oxide dodecagonal quasicrystals as well as related complex approximant phases was recently reported in thin films derived from ... ...

    Abstract The formation of two-dimensional oxide dodecagonal quasicrystals as well as related complex approximant phases was recently reported in thin films derived from BaTiO
    Language English
    Publishing date 2022-03-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/d1cp05296a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: Nodeless time-reversal symmetry breaking in the centrosymmetric superconductor Sc$_5$Co$_4$Si$_{10}$ probed by muon-spin spectroscopy

    Bhattacharyya, A. / Lees, M. R. / Panda, K. / Ferreira, P. P. / Dorini, T. T. / Gaudry, Emilie / Eleno, L. T. F. / Anand, V. K. / Sannigrahi, J. / Biswas, P. K. / Tripathi, R. / Adroja, D. T.

    2022  

    Abstract: We investigate the superconducting properties of Sc$_{5}$Co$_{4}$Si$_{10}$ using low-temperature resistivity, magnetization, heat capacity, and muon-spin rotation and relaxation ($\mu$SR) measurements. We find that Sc$_{5}$Co$_{4}$Si$_{10}$ {exhibits ... ...

    Abstract We investigate the superconducting properties of Sc$_{5}$Co$_{4}$Si$_{10}$ using low-temperature resistivity, magnetization, heat capacity, and muon-spin rotation and relaxation ($\mu$SR) measurements. We find that Sc$_{5}$Co$_{4}$Si$_{10}$ {exhibits type-II} superconductivity with a superconducting transition temperature $T_\mathrm{C}= 3.5 (1)$\,K. The temperature dependence of the superfluid density obtained from transverse-field $\mu$SR spectra is best modeled using an isotropic Bardeen-Cooper-Schrieffer type $s$-wave gap symmetry with $2\Delta/k_\mathrm{B}T_\mathrm{C} = 2.84(2)$. However, the zero-field muon-spin relaxation asymmetry reveals the appearance of a spontaneous magnetic field below $T_\mathrm{C}$, indicating that time-reversal symmetry (TRS) is broken in the superconducting state. Although this behavior is commonly associated with non-unitary or mixed singlet-triplet pairing, our group-theoretical analysis of the Ginzburg-Landau free energy alongside density functional theory calculations indicates that unconventional mechanisms are pretty unlikely. Therefore, we have hypothesized that TRS breaking may occur via a conventional electron-phonon process.

    Comment: 9 pages, 6 figures
    Keywords Condensed Matter - Superconductivity ; Condensed Matter - Materials Science ; Condensed Matter - Strongly Correlated Electrons
    Publishing date 2022-05-19
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Electron-phonon superconductivity in C-doped topological nodal-line semimetal Zr

    Bhattacharyya, A / Ferreira, P P / Panda, K / Masunaga, S H / de Faria, L R / Correa, L E / Santos, F B / Adroja, D T / Yokoyama, K / Dorini, T T / Jardim, R F / Eleno, L T F / Machado, A J S

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

    2021  Volume 34, Issue 3

    Abstract: In the present work, we demonstrate that C-doped ... ...

    Abstract In the present work, we demonstrate that C-doped Zr
    Language English
    Publishing date 2021-11-02
    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/ac2bc7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Electron-phonon superconductivity in C-doped topological nodal-line semimetal Zr$_5$Pt$_3$

    Bhattacharyya, A / Ferreira, P P / Panda, K / Santos, F B / Adroja, D T / Yokoyama, K / Dorini, T T / Eleno, L T F / Machado, A J S

    A muon spin rotation and relaxation ($\mu$SR) study

    2021  

    Abstract: In the present work we demonstrate that C-doped Zr$_{5}$Pt$_{3}$ is an electron-phonon superconductor (with critical temperature T$_\mathrm{C}$ = 3.7\,K) with a nonsymmorphic topological Dirac nodal-line semimetal state, which we report here for the ... ...

    Abstract In the present work we demonstrate that C-doped Zr$_{5}$Pt$_{3}$ is an electron-phonon superconductor (with critical temperature T$_\mathrm{C}$ = 3.7\,K) with a nonsymmorphic topological Dirac nodal-line semimetal state, which we report here for the first time. The superconducting properties of Zr$_{5}$Pt$_{3}$C$_{0.5}$ have been investigated by means of magnetization and muon spin rotation and relaxation ($\mu$SR) measurements. We find that at low temperatures the depolarization rate is almost constant and can be well described by a single-band $s-$wave model with a superconducting gap of $2\Delta(0)/k_\mathrm{B}T_\mathrm{C}$ = 3.84, close to the value of BCS theory. From transverse field $\mu$SR analysis we estimate the London penetration depth $\lambda_{L}$ = 469 nm, superconducting carrier density $n_{s}$ = 2$\times$10$^{26}$ $m^{-3}$, and effective mass m$^{*}$ = 1.584 $m_{e}$. Zero field $\mu$SR confirms the absence of any spontaneous magnetic moment in the superconducting ground state. To gain additional insights into the electronic ground state of C-doped Zr$_5$Pt$_3$, we have also performed first-principles calculations within the framework of density functional theory (DFT). The observed homogenous electronic character of the Fermi surface as well as the mutual decrease of $T_\mathrm{C}$ and density of states at the Fermi level are consistent with the experimental findings. However, the band structure reveals the presence of robust, gapless fourfold-degenarate nodal lines protected by $6_{3}$ screw rotations and glide mirror planes. Therefore, Zr$_5$Pt$_3$ represents a novel, unprecedented condensed matter system to investigate the intricate interplay between superconductivity and topology.

    Comment: 9 pages, 5 figures
    Keywords Condensed Matter - Superconductivity ; Condensed Matter - Materials Science
    Subject code 541
    Publishing date 2021-04-21
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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