Nuclear Magnetic Relaxation Rate in Iron-Pnictide Superconductors
T. Kariyado, M. Ogata
TL;DR
This paper calculates the nuclear magnetic relaxation rate in iron-pnictide superconductors using a microscopic gap function, analyzing its temperature dependence and the effects of Coulomb interactions to better interpret experimental data.
Contribution
It provides a microscopic calculation of 1/T_1 in iron-pnictides and discusses the impact of Coulomb interactions on relaxation rates.
Findings
Rapid decrease of 1/T_1 below transition temperature
Difference between nodeless and nodal s-wave gaps
Coulomb interaction significantly affects 1/T_1
Abstract
Nuclear magnetic relaxation rate 1/T_1 in iron-pnictide superconductors is calculated using the gap function obtained in a microscopic calculation. Based on the obtained results, we discuss the issues such as the rapid decrease of 1/T_1 just below the transition temperature and the difference between nodeless and nodal s-wave gap functions. We also investigate the effect of Coulomb interaction on 1/T_1 in the random phase approximation and show its importance in interpreting the experimental results.
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