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SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 3: Superconductivity: Properties and Electronic Structure

TT 3.8: Vortrag

Montag, 27. März 2023, 11:30–11:45, HSZ 103

Emergence of incipient superconductivity in CrB2 under anisotropic strainAlexander Regnat1, •André Deyerling1, Christoph Resch1, Jan Spallek1, Alfonso Chacon1, Philipp G. Niklowitz1,2, Andreas Bauer1, Marc A. Wilde1, and Christian Pfleiderer11Physik-Department, Technical University of Munich, D-85748 Garching, Germany — 2Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK

Resistivity studies of the hexagonal C32 diborides MoB2[1], WB2[2], and CrB2[3,4] under ultra-high pressures of the order 100 GPa have recently revealed superconducting transitions, where the precise pressure conditions are unknown. We report a study of the electrical resistivity of the itinerant-electron antiferromagnet CrB2 [5,6] under uniaxial, hydrostatic, and quasi-hydrostatic pressures up to 0.5 GPa, 2.2 GPa and 8 GPa, respectively. Tracking the magnetic transition temperature and the onset of incipient superconductivity we derive a phase diagram as a function of the ratio of lattice constants c/a. Supported by detailed electronic structure calculations, we suggest that the reduction of lattice constant c controls the suppression of magnetic order and concomitant emergence of superconductivity in CrB2.

[1] C. Pei et al., arXiv:2105.13250 (2021)

[2] J. Lim et al., arXiv:2109.11521 (2021)

[3] C. Pei et al., arXiv:2109.15213 (2021)

[4] S. Biswas et al. arXiv:2211.01054 (2022)

[5] M. Brasse et al., PRB 88, 155138 (2013)

[6] A. Bauer et al., PRB 90, 064414 (2014)

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