Uncommonly high upper critical field of the pyrochlore superconductor KOs2O6 below the enhanced paramagnetic limit
T. Shibauchi, L. Krusin-Elbaum, Y. Kasahara, Y. Shimono, Y. Matsuda, R. D. McDonald, C. H. Mielke, S. Yonezawa, Z. Hiroi, M. Arai, T. Kita, G. Blatter, M. Sigrist
DOI 10.1103/PhysRevB.74.220506 · Physical Review B
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Abstract
The entire temperature dependence of the upper critical field Hc2 in the β-pyrochlore KOs2O6 is obtained from high-field resistivity and magnetic measurements. Both techniques identically give Hc2(T≃0K) not only surprisingly high (∼33T), but also the approach to it is unusually temperature linear all the way below Tc(=9.6K). We show that, while Hc2(0) exceeds a simple spin-singlet paramagnetic limit HP, it is well below an HP enhanced due to the missing spatial inversion symmetry reported recently in KOs2O6, ensuring that the pair breaking here is executed by orbital degrees. Ab initio calculations of orbital Hc2 show that an unusual temperature dependence is reproduced if dominant s-wave superconductivity resides on the smaller closed Fermi surfaces.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.6 | Pressure not reported | unknown |
| KOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.6 | Pressure not reported | unknown |
| CsOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.3 | Pressure not reported | unknown |
| RbOs2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.3 | Pressure not reported | unknown |
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