Theory of the orbital moment in a superconductor
Joshua Robbins, James F. Annett, Martin Gradhand
DOI 10.1103/PhysRevB.101.134505 · Physical Review B
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Abstract
The chiral p-wave superconducting state is comprised of spin-triplet Cooper pairs carrying a finite orbital angular momentum. For the case of a periodic lattice, calculating the net magnetization arising from this orbital component presents a challenge as the circulation operator r̂×p̂ is not well defined in the Bloch representation. This difficulty has been overcome in the normal state, for which a modern theory is firmly established. Here, we derive the extension of this normal-state approach, generating a theory which is valid for a general superconducting state, and go on to perform model calculations for a chiral p-wave state in Sr2RuO4. The results suggest that the magnitude of the elusive edge current in Sr2RuO4 is finite, but lies below experimental resolution. This provides a possible solution to the longstanding controversy concerning the gap symmetry of the superconducting state in this material.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.5 | Pressure not reported | onset |
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