Pressure-induced electronic phase separation of magnetism and superconductivity in CrAs

Khasanov, Rustem; Guguchia, Zurab; Eremin, Ilya; Luetkens, Hubertus; Amato, Alex; Biswas, Pabitra K.; Ruegg, Christian; Susner, Michael A.; Sefat, Athena S.; Zhigadlo, Nikolai D.; Morenzoni, Elvezio

doi:10.1038/srep13788

Title: Pressure-induced electronic phase separation of magnetism and superconductivity in CrAs

Journal Article · Tue Sep 08 00:00:00 EDT 2015 · Scientific Reports

DOI:https://doi.org/10.1038/srep13788· OSTI ID:1259706

Khasanov, Rustem ^[1]; Guguchia, Zurab ^[1]; Eremin, Ilya ^[2]; Luetkens, Hubertus ^[1]; Amato, Alex ^[1]; Biswas, Pabitra K. ^[1]; Ruegg, Christian ^[3]; Susner, Michael A. ^[4]; Sefat, Athena S. ^[4]; Zhigadlo, Nikolai D. ^[5]; Morenzoni, Elvezio ^[1]

Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Ruhr-Univ. Bochum, Bochum (Germany); Federal Univ., Kazan (Russia)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); Univ. of Geneva, Geneva (Switzerland)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
ETH Zurich, Zurich (Switzerland)

We report that the recent discovery of pressure (p) induced superconductivity in the binary helimagnet CrAs has raised questions on how superconductivity emerges from the magnetic state and on the mechanism of the superconducting pairing. In the present work the suppression of magnetism and the occurrence of superconductivity in CrAs were studied by means of muon spin rotation. The magnetism remains bulk up to p ≃ 3.5 kbar while its volume fraction gradually decreases with increasing pressure until it vanishes at p ≃ 7 kbar. At 3.5 kbar superconductivity abruptly appears with its maximum T_c ≃ 1.2 K which decreases upon increasing the pressure. In the intermediate pressure region (3.5≲ p ≲ 7 kbar) the superconducting and the magnetic volume fractions are spatially phase separated and compete for phase volume. Our results indicate that the less conductive magnetic phase provides additional carriers (doping) to the superconducting parts of the CrAs sample thus leading to an increase of the transition temperature (T_c) and of the superfluid density (ρ_s). A scaling of ρ_s with T_c^3.2 as well as the phase separation between magnetism and superconductivity point to a conventional mechanism of the Cooper-pairing in CrAs.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 57051534; AC05-00OR22725

OSTI ID:: 1259706

Alternate ID(s):: OSTI ID: 1286900

Journal Information:: Scientific Reports, Vol. 5; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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