Reversal of the Upper Critical Field Anisotropy and Spin-Locked Superconductivity in K2Cr3As3 | Zendy

Fedor Balakirev | Zendy; Tai Kong | Zendy; M. Jaime | Zendy; R. McDonald | Zendy; C. H. Mielke | Zendy; A. Gurevich | Zendy; P. C. Canfield | Zendy; S.L. Bud’ko | Zendy

Open Access

Reversal of the Upper Critical Field Anisotropy and Spin-Locked Superconductivity in K2Cr3As3

Author(s) -

Fedor Balakirev,

Tai Kong,

M. Jaime,

R. McDonald,

C. H. Mielke,

A. Gurevich,

P. C. Canfield,

S.L. Bud’ko

Publication year - 2016

Publication title -

bulletin of the american physical society

Language(s) - English

Resource type - Reports

DOI - 10.2172/1237414

Subject(s) - critical field , superconductivity , condensed matter physics , anisotropy , physics , lattice (music) , magnetic field , field (mathematics) , quantum mechanics , mathematics , acoustics , pure mathematics

Recently, superconductivity in K2Cr3As3 (Tc =6.1 K) was discovered. The crystalline lattice contains an array of weakly coupled, double well [(Cr3As3)2-]∞ linkages stretched along the c axis, suggesting the possibility of quasi-one-dimensional superconductivity. Moderately anisotropic upper critical field was revealed in single crystals, with very large initial slopes, dH∥c2 /dT=12 T/K along the Cr chains and dHperpendicularc2 /dT =7 T/K perpendicular to the chains. Given the ambiguity of conclusions based on the extrapolations of Hc2(T) measured near Tc to low temperatures, we performed high-field measurements of Hc2(T) on K2Cr3As3 single crystals in pulsed magnetic fields which enabled us to reveal the full anisotropic Hc2(T) curves from Tc down to 600 mK.

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