Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Iowa State Univ., Ames, IA (United States)
- 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, H∥c2(T), exhibits a paramagnetically limited behavior, whereas the shape of the H⊥c2(T) curve (perpendicular to the Cr chains) has no evidence of paramagnetic effects. As a result, the curves H⊥c2(T) and H∥c2(T) cross at T≈4K, so that the anisotropy parameter γH(T)=H⊥c2/H∥c2(T)increases from γH(Tc)≈0.35 near Tc to γH(0)≈1.7 at 0.6 K. This behavior of H∥c2(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)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-07CH11358; AC52-06NA25396
- OSTI ID:
- 1227371
- Alternate ID(s):
- OSTI ID: 1198509
OSTI ID: 1258007
- Report Number(s):
- IS-J--8708; LA-UR-15-24703
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 22 Vol. 91; ISSN 1098-0121; ISSN PRBMDO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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