Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in
Abstract
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. The paramagnetically limited 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.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Iowa State Univ., Ames, IA (United States)
- Old Dominion Univ., Norfolk, VA (United States)
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1227371
- Alternate Identifier(s):
- OSTI ID: 1198509; OSTI ID: 1258007
- Report Number(s):
- IS-J-8708; LA-UR-15-24703
Journal ID: ISSN 1098-0121; PRBMDO
- Grant/Contract Number:
- AC02-07CH11358; DMR1157490; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 22; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High Magnetic Field Science
Citation Formats
Balakirev, F. F., Kong, T., Jaime, M., McDonald, R. D., Mielke, C. H., Gurevich, A., Canfield, P. C., and Bud'ko, S. L. Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.91.220505.
Balakirev, F. F., Kong, T., Jaime, M., McDonald, R. D., Mielke, C. H., Gurevich, A., Canfield, P. C., & Bud'ko, S. L. Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3. United States. https://doi.org/10.1103/PhysRevB.91.220505
Balakirev, F. F., Kong, T., Jaime, M., McDonald, R. D., Mielke, C. H., Gurevich, A., Canfield, P. C., and Bud'ko, S. L. Tue .
"Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3". United States. https://doi.org/10.1103/PhysRevB.91.220505. https://www.osti.gov/servlets/purl/1227371.
@article{osti_1227371,
title = {Anisotropy reversal of the upper critical field at low temperatures and spin-locked superconductivity in K2Cr3As3},
author = {Balakirev, F. F. and Kong, T. and Jaime, M. and McDonald, R. D. and Mielke, C. H. and Gurevich, A. and Canfield, P. C. and Bud'ko, S. L.},
abstractNote = {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. The paramagnetically limited 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.},
doi = {10.1103/PhysRevB.91.220505},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 22,
volume = 91,
place = {United States},
year = {Tue Jun 23 00:00:00 EDT 2015},
month = {Tue Jun 23 00:00:00 EDT 2015}
}
Web of Science
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