Spontaneous surface current in multicomponent cubic superconductors with time-reversal symmetry breaking
Jia-Long Zhang, Wen Huang, Dao-Xin Yao
DOI 10.1103/PhysRevB.98.014511 · Physical Review B
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Abstract
In this paper we present a comprehensive study of the spontaneous currents in time-reversal symmetry breaking (TRSB) multicomponent superconductors with cubic crystalline symmetry. We argue, not limiting to cubic lattices, that spontaneous current on certain high-symmetry surfaces can exist only if the TRSB pairing simultaneously breaks a certain pair of mirror symmetries. This is shown to have exact correspondence with the Gingzburg-Landau (GL) theory and is verified by numerical Bogoliubov de-Gennes (BdG) calculations. In the course we extend the BdG to include effects of gap anisotropy and surface disorder, both of which could lead to much suppressed current. The GL theory has been known to describe well the spontaneous current. However, we highlight a special case where it becomes less adequate and show that a refined effective theory for low temperatures is needed. These results could shed light on the phenomenology of cubic superconductors such as U1−xThxBe13, the filled skutterudites PrOs4Sb12, PrPt4Ge12, and related compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| U1-xThxBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| PrOs4Sb12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| PrPt4Ge12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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