Local NMR relaxation rates T1−1 and T2−1 depending on the d-vector symmetry in the vortex state of chiral and helical p-wave superconductors
Kenta K. Tanaka, Masanori Ichioka, Seiichiro Onari
DOI 10.1103/PhysRevB.97.134507 · Physical Review B
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Abstract
Local NMR relaxation rates in the vortex state of chiral and helical p-wave superconductors are investigated by the quasiclassical Eilenberger theory. We calculate the spatial and resonance frequency dependences of the local NMR spin-lattice relaxation rate T1−1 and spin-spin relaxation rate T2−1. Depending on the relation between the NMR relaxation direction and the d-vector symmetry, the local T1−1 and T2−1 in the vortex core region show different behaviors. When the NMR relaxation direction is parallel to the d-vector component, the local NMR relaxation rate is anomalously suppressed by the negative coherence effect due to the spin dependence of the odd-frequency s-wave spin-triplet Cooper pairs. The difference between the local T1−1 and T2−1 in the site-selective NMR measurement is expected to be a method to examine the d-vector symmetry of candidate materials for spin-triplet superconductors.
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. | — | Pressure not reported | unknown |
| UPt3 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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