Temperature and angular dependence of the upper critical field in K2Cr3As3

Huakun Zuo, Jin Ke Bao, Yi Liu, Jinhua Wang, Zhao Jin, Zhengcai Xia, Liang Li, Zhuan Xu, Jian Kang, Zengwei Zhu, Guang Han Cao

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Abstract

We report measurements of the upper critical field Hc2 as functions of temperature T, polar angle θ (of the field direction with respect to the crystallographic c axis), and azimuthal angle φ (of the field direction relative to the a axis within the ab plane) for the Cr-based superconductor K2Cr3As3 with a quasi-one-dimensional and noncentrosymmetric crystal structure. We confirm that the anisotropy in Hc2(T) becomes inverse with decreasing temperature. At low temperatures, Hc2(θ) data are featured by two maxima at θ=0 (Hc) and π/2 (Hc), which can be quantitatively understood only if uniaxial effective-mass anisotropy and absence of Pauli paramagnetic effect for Hc are taken simultaneously into consideration. The in-plane Hc2(φ) profile shows a unique threefold modulation especially at low temperatures. Overall, the characteristics of the Hc2(θ,φ,T) data mostly resemble those of the heavy-fermion superconductor UPt3, and we argue in favor of a dominant spin-triplet superconductivity with odd parity in K2Cr3As3.

Original languageEnglish (US)
Article number014502
JournalPhysical Review B
Volume95
Issue number1
DOIs
StatePublished - Jan 3 2017

Bibliographical note

Funding Information:
J.K. is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. de-sc0012336. Z.Z. is supported by the 1000 Youth Talents Plan, the National Science Foundation of China (Grant No. 11574097) and The National Key Research and Development Program of China (Grant No. 2016YFA0401704). G.-H.C. is supported by National Key R & D Program of the MOST of China (Grant No. 2016YFA0300202) and the National Science Foundation of China (Grant No. 11674281).

Publisher Copyright:
© 2017 American Physical Society.

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