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

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, dHc2 /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.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [2] ;  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  3. Old Dominion Univ., Norfolk, VA (United States)
Publication Date:
OSTI Identifier:
1237414
Report Number(s):
LA-UR--16-20714
TRN: US1600522
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRITICAL FIELD; SUPERCONDUCTIVITY; MONOCRYSTALS; ANISOTROPY; TEMPERATURE RANGE 00-0013 K; EXTRAPOLATION; DIAGRAMS; PULSES; POTASSIUM COMPOUNDS; CHROMIUM ARSENIDES High Magnetic Field Science