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  Conventional type-II superconductivity in locally noncentrosymmetric LaRh2As2 single crystals

Landaeta, J. F., León, A. M., Zwickel, S., Lühmann, T., Brando, M., Geibel, C., et al. (2022). Conventional type-II superconductivity in locally noncentrosymmetric LaRh2As2 single crystals. Physical Review B, 106(1): 014506, pp. 1-10. doi:10.1103/PhysRevB.106.014506.

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Landaeta, J. F.1, Autor           
León, A. M.2, Autor           
Zwickel, S.3, Autor
Lühmann, T.2, Autor           
Brando, M.4, Autor           
Geibel, C.5, Autor           
Eljaouhari, E.-O.3, Autor
Rosner, H.2, Autor           
Zwicknagl, G.6, Autor           
Hassinger, E.1, Autor           
Khim, S.2, Autor           
Affiliations:
1Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_2466700              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
3External Organizations, ou_persistent22              
4Manuel Brando, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863469              
5Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
6Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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Schlagwörter: Arsenic compounds, Cerium compounds, Electron-phonon interactions, Electrons, Iron-based Superconductors, Lanthanum compounds, Magnetic susceptibility, Single crystals, Specific heat, Superconducting transition temperature, Technetium compounds, A.C. susceptibility, Ac susceptibility, F-electrons, Field temperature, Heavy-fermion systems, Magnetic-field, Super conducting phasis, Superconducting transitions, Type-II superconductivity, Zero resistivity, Crystal structure
 Zusammenfassung: We report on the observation of superconductivity in LaRh2As2, which is the analog without f electrons of the heavy-fermion system with two superconducting phases CeRh2As2 [S. Khim, Science 373, 1012 (2021)10.1126/science.abe7518]. A zero-resistivity transition, a specific-heat jump, and a drop in magnetic ac susceptibility consistently point to a superconducting transition at a temperature of Tc=0.28 K. The magnetic-field temperature superconducting phase diagrams determined from field-dependent ac-susceptibility measurements reveal small upper critical fields μ0Hc2≈12 mT for H∥ab and μ0Hc2≈9 mT for H∥c. The observed Hc2 is larger than the estimated thermodynamic critical-field Hc derived from the heat-capacity data, suggesting that LaRh2As2 is a type-II superconductor with Ginzburg-Landau parameters κGLab≈1.9 and κGLc≈2.7. The microscopic Eliashberg theory indicates superconductivity to be in the weak-coupling regime with an electron-phonon-coupling constant λe-ph≈0.4. Despite a similar Tc and the same crystal structure as the Ce compound, LaRh2As2 displays conventional superconductivity, corroborating the substantial role of the 4f electrons for the extraordinary superconducting state in CeRh2As2. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by the Max Planck Society.

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Sprache(n): eng - English
 Datum: 2022-07-062022-07-06
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1103/PhysRevB.106.014506
 Art des Abschluß: -

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Titel: Physical Review B
  Alternativer Titel : Phys. Rev. B
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: American Physical Society
Seiten: - Band / Heft: 106 (1) Artikelnummer: 014506 Start- / Endseite: 1 - 10 Identifikator: ISBN: 24699950 (ISSN)