Magnetic fluctuations and superconductivity in Fe pnictides probed by electron spin resonance

Details Magnetic fluctuations and superconductivity in Fe pnictides probed by electron spin resonance Magnetic fluctuations and superconductivity in Fe pnictides probed by electron spin resonance

2010-01-08

arxiv.org/abs/1001.1302v2

Phys. Rev. B 82, 054525 (2010)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.82.054525

The electron spin resonance absorption spectrum of Eu^{2+} ions serves as a probe of the normal and superconducting state in Eu_{0.5}K_{0.5}Fe_2As_2. The spin-lattice relaxation rate 1/T_1^{\rm ESR} obtained from the ESR linewidth exhibits a Korringa-like linear increase with temperature above T_C 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 T_C the spin-lattice relaxation rate 1/T_1^{\rm ESR} follows a T^{1.5}-behavior without the appearance of a coherence peak.

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