Evidence for triplet superconductivity near an antiferromagnetic instability in CrAs

Abstract

Superconductivity was recently observed in CrAs as the helimagnetic order is suppressed by applying pressure, suggesting possible unconventional superconductivity. To reveal the nature of the superconducting order parameter of CrAs, here we report the angular dependence of the upper critical field under pressure. Upon rotating the field by 360 degrees in the $bc$-plane, six maxima are observed in the upper critical field, where the oscillations have both six-fold and two-fold symmetric components. Our analysis suggests the presence of an unconventional odd-parity spin triplet state.

arXiv comment9 pages, 5 figures

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• Multiple band-crossings and Fermi surface topology: role of double nonsymmorphic symmetries in MnP-type crystal structures
• Nonsaturating large magnetoresistance in the high carrier density nonsymmorphic metal CrP
• Anomalous helimagnetic domain shrinkage due to the weakening of Dzyaloshinskii-Moriya interaction in CrAs
• Tunable quantum critical point and detached superconductivity in Al-doped CrAs
• The incommensurate magnet iron monophosphide FeP: Crystal growth and characterization
• Lattice dynamics in the double-helix antiferromagnet FeP
• Comparative studies on unconventional superconductivity in Cr${}_3$Ru compounds with bcc and A15 structures
• Magnetic correlations in the pressure-induced superconductor CrAs investigated by ${}^{75}$As nuclear magnetic resonance
• Dimensionality of the superconductivity in the transition metal pnictide WP