Theory of mixed-state effect on NMR relaxation measurements in iron pnictide superconductors
Yi Gao, Jian-Xin Zhu, C. S. Ting, Wu-Pei Su
DOI 10.1103/PhysRevB.84.224509 · Physical Review B
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Abstract
Based on a phenomenological model with s± or s-wave pairing symmetry, the spatially resolved nuclear magnetic resonance (NMR) relaxation rate in the iron pnictides is investigated by solving Bogoliubov-de Gennes equations. Taking into account the presence of a magnetic field, our result for the s± pairing is in qualitative agreement with recent NMR experiments, while for the s-wave pairing, a coherence peak shows up right below Tc in apparent contradiction with experimental observations, thus excluding the s-wave pairing. We also propose that the spin-lattice relaxation rate (SLRR) should follow an exponential relation when the temperature is lowered below T/Tc≈0.1 down to 0.01. It is noted that the SLRR cannot be entirely determined by the local density of states; the mixed-state effect and multiorbital physics must be considered.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ba1-xKxFe2As2 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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