Magnetic fluctuations and superconductivity in iron pnictides as probed by electron spin resonance
N. Pascher, J. Deisenhofer, H.-A. Krug von Nidda, M. Hemmida, H. S. Jeevan, P. Gegenwart, A. Loidl
DOI 10.1103/PhysRevB.82.054525 · Physical Review B
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Abstract
The electron spin resonance (ESR) absorption spectrum of Eu2+ ions serves as a probe of the normal and superconducting state in Eu0.5K0.5Fe2As2. The spin-lattice relaxation rate 1/T1ESR obtained from the ESR linewidth exhibits a Korringa-type linear increase with increasing temperature above Tc evidencing a normal Fermi-liquid behavior. Below 45 K deviations from the Korringa law occur which are ascribed to enhanced magnetic fluctuations within the FeAs layers upon approaching the superconducting transition. Below Tc the spin lattice relaxation rate 1/T1ESR follows a T1.5 behavior without any appearance of a coherence peak.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Eu0.5K0.5Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Eu0.5K0.5Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Eu0.5K0.5Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| EuFe2(As0.7P0.3)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
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