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Title: Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K 2 Cr 3 As 3

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [2];  [1];  [1];  [1];  [3];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Old Dominion Univ., Norfolk, VA (United States)

We report measurements of the anisotropic upper critical field Hc2(T) for K2Cr3As3 single crystals up to 60 T and T>0.6K. Our results show that the upper critical field parallel to the Cr chains, Hc2(T), exhibits a paramagnetically limited behavior, whereas the shape of the Hc2(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves Hc2(T) and Hc2(T) cross at T≈4K, so that the anisotropy parameter γH(T)=Hc2/Hc2(T) increases from γH(Tc)≈0.35 near Tc to γH(0)≈1.7 at 0.6 K. The paramagnetically limited behavior of Hc2(T) is inconsistent with triplet superconductivity but suggests a form of singlet superconductivity with the electron spins locked onto the direction of Cr chains.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358; DMR1157490; AC52-06NA25396
OSTI ID:
1227371
Alternate ID(s):
OSTI ID: 1198509; OSTI ID: 1258007
Report Number(s):
IS-J-8708; LA-UR-15-24703; PRBMDO
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 22; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (11)

Exploring Topological Superconductivity in Topological Materials journal July 2019
Electronic Structures of Newly Discovered Quasi-One-Dimensional Superconductors A2Mo3As3 (A=K,Rb,Cs) journal February 2019
A brief review on μSR studies of unconventional Fe- and Cr-based superconductors journal October 2018
Synthesis, crystal structure and physical properties of quasi-one-dimensional ACr3As3(A = Rb, Cs) journal July 2015
Superconductivity with peculiar upper critical fields in quasi-one-dimensional Cr-based pnictides journal October 2018
Anisotropic upper critical field of pristine and proton-irradiated single crystals of the magnetically ordered superconductor RbEuFe 4 As 4 journal August 2019
Multiband superconductivity and possible nodal gap in RbCr 3 As 3 revealed by Andreev reflection and single-particle tunneling measurements journal September 2019
Upper critical field and its anisotropy in RbCr 3 As 3 journal December 2019
Synthesis, crystal structure and physical properties of quasi-one-dimensional ACr$_3$As$_3$ (A = Rb, Cs) text January 2015
A brief review on muSR studies of unconventional Fe and Cr-based superconductors text January 2018
Exploring Topological Superconductivity in Topological Materials text January 2019

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