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

Balakirev, Fedor Fedorovich¹  Kong, T.²  Iowa State Univ., Ames, IA (United States)]  Jaime, Marcelo¹  McDonald, Ross David¹  Mielke, Charles H.¹  Gurevich, A.³  Canfield, P. C.²  Iowa State Univ., Ames, IA (United States)]  Bud'ko, S. L.²  Iowa State Univ., Ames, IA (United States)] 

[1] Los Alamos National Lab. (LANL), Los Alamos, NM (United States);Ames Lab., Ames, IA (United States);Old Dominion Univ., Norfolk, VA (United States)

关键词: CRITICAL FIELD;    SUPERCONDUCTIVITY;    MONOCRYSTALS;    ANISOTROPY;    TEMPERATURE RANGE 00-0013 K;    EXTRAPOLATION;    DIAGRAMS;    PULSES;    POTASSIUM COMPOUNDS;    CHROMIUM ARSENIDES High Magnetic Field Science;   

DOI  :  10.2172/1237414
RP-ID  :  LA-UR--16-20714
PID  :  OSTI ID: 1237414
Others  :  TRN: US1600522

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

Recently, superconductivity in K₂Cr₃As₃ (T_c =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 dH^{perpendicular}_c2 /dT =7 T/K perpendicular to the chains. Given the ambiguity of conclusions based on the extrapolations of H_c2(T) measured near T_c to low temperatures, we performed high-field measurements of H_c2(T) on K₂Cr₃As₃ single crystals in pulsed magnetic fields which enabled us to reveal the full anisotropic H_c2(T) curves from T_c down to 600 mK.