S. V. Demishev, A. N. Samarin, V. V. Glushkov, M. I. Gilmanov, I. I. Lobanova, N. A. Samarin, A. V. Semeno, N. E. Sluchanko, N. M. Chubova, V. A. Dyadkin, S. V. Grigor'ev, “Anomalous spin relaxation and quantum criticality in Mn$_{1-x}$Fe$_{x}$Si solid solutions”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2014, Volume 100, Issue 1,Pages 30

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Anomalous spin relaxation and quantum criticality in Mn$_{1-x}$Fe$_{x}$Si solid solutions

S. V. Demishev^ab, A. N. Samarin^ab, V. V. Glushkov^ab, M. I. Gilmanov^ab, I. I. Lobanova^ab, N. A. Samarin^a, A. V. Semeno^a, N. E. Sluchanko^a, N. M. Chubova^c, V. A. Dyadkin^c, S. V. Grigor'ev^c

^a A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow
^b Moscow Institute of Physics and Technology
^c B. P. Konstantinov Petersburg Nuclear Physics Institute, Russian Academy of Sciences

Abstract: We report results of the high frequency ($60$ GHz) electron spin resonance (ESR) study of the quantum critical metallic system Mn$_{1- x}$Fe$_{x}$Si. The ESR is observed for the first time in the concentration range $0 < x < 0.24$ at temperatures up to $50$ K. The application of the original experimental technique allowed carrying out line shape analysis and finding full set of spectroscopic parameters, including oscillating magnetization, line width and $g$ factor. The strongest effect of iron doping consists in influence on the ESR line width and spin relaxation is marked by both violation of the classical Korringa-type relaxation and scaling behavior. Additionally, the non-Fermi-liquid effects in the temperature dependence of the ESR line width, which may be quantitatively described in the theory of Wölfle and Abrahams, are observed at quantum critical points $x^{*} \sim 0.11$ and $x_{c} \sim 0.24$.

Received: 27.05.2014

Language: English

DOI: 10.7868/S0370274X14130062