Finite momentum superconductivity in superconducting hybrids: Orbital mechanism
M. Yu. Levichev, I. Yu. Pashenkin, N. S. Gusev, D. Yu. Vodolazov
DOI 10.1103/PhysRevB.108.094517 · Physical Review B
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Abstract
Normally, in superconductors, as in conductors, in a state with zero current I the momentum of superconducting electrons ℏq=0. Here we demonstrate theoretically and present experimental evidence that in a superconducting/normal metal (SN) hybrid strip placed in an in-plane magnetic field Bin a finite momentum state (ℏq≠0) is realized when I=0. This state is characterized by current-momentum dependence I(q)≠−I(−q), nonreciprocal kinetic inductance Lk(I)≠Lk(−I), and different values of depairing currents Idep± flowing along the SN strip in opposite directions. The properties found have orbital nature and originate from the density gradient of superconducting electrons ∇n across the thickness of the SN strip and field-induced Meissner currents. We argue that this type of finite momentum state should be a rather general phenomenon in superconducting structures with artificial or intrinsic inhomogeneities.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.87 | Pressure not reported | midpoint |
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