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

Scientific Reports
R KhasanovElvezio Morenzoni

Abstract

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 Tc ≃ 1.2 K which decreases upon increasing the pressure. In the intermediate pressure region (3.5 < or ~  p < or ~ 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 (Tc) and of the superfluid density (ρs). A scaling of ρs with Tc(3.2) as well as the phase separation between magnetism and superconductivity point to a conventional mechanism of the Cooper-pairing in CrAs.

References

Feb 27, 1995·Physical Review Letters·V A StengerR P Ziebarth
Mar 24, 2005·Physical Review Letters·F L Pratt, S J Blundell
Dec 8, 2011·Nature Communications·Miaoyin WangPengcheng Dai
Nov 20, 2014·Nature Communications·Wei WuJianlin Luo

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Citations

Jun 24, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Jinguang Cheng, Jianlin Luo
Dec 14, 2018·Reports on Progress in Physics·R Y Chen, N L Wang
Apr 22, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·H KotegawaH Harima
Mar 23, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R KhasanovN D Zhigadlo
Apr 6, 2017·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Carmine AutieriCanio Noce

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