Effects of vortices and impurities on the nuclear spin relaxation rate in iron-based superconductors
Hong-Min Jiang, Jia Guo, Jian-Xin Li
DOI 10.1103/PhysRevB.84.014533 · Physical Review B
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Abstract
The effects of magnetic vortices and nonmagnetic impurities on the low-energy quasiparticle excitations and the spin-lattice relaxation rate are examined in the iron-based superconductors for the s±-, s-, and d-wave pairing symmetries. The main effect of the vortices is to enhance the quasiparticle excitations and the spin-lattice relaxation rate for all symmetries, which leads to a T3 dependence of the relaxation rate followed by a nearly linear T dependence at lower temperatures. This enhancement can only be seen for the s±- and d-wave symmetries in the presence of nonmagnetic impurities. These results suggest that the s±-wave and d-wave pairing states behave similarly in response to the magnetic field and nonmagnetic impurities, therefore, it may be impossible to distinguish them on the basis of the measurements of spin-lattice relaxation rates when a magnetic field and/or impurity scatterings are present.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Eu0.7Na0.3Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeTe1-xSx 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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