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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.

bulletin of the american physical society

Reversal of the Upper Critical Field Anisotropy and Spin-Locked Superconductivity in K&lt;sub&gt;2&lt;/sub&gt;Cr&lt;sub&gt;3&lt;/sub&gt;As&lt;sub&gt;3&lt;/sub&gt;