Open AccessMagnetic resonance anisotropy in CeB6: an entangled state of the art
Author(s) -
A. V. Semeno,
M. I. Gilmanov,
A. V. Bogach,
V. N. Krasnorussky,
A. N. Samarin,
N. A. Samarin,
N. E. Sluchanko,
N. Yu. Shitsevalova,
В. Б. Филипов,
V. V. Ġlushkov,
S. V. Demishev
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep39196
Subject(s) - magnetization , condensed matter physics , anisotropy , spin (aerodynamics) , resonance (particle physics) , line (geometry) , physics , ground state , electron paramagnetic resonance , phase (matter) , magnetic anisotropy , magnetic field , nuclear magnetic resonance , atomic physics , optics , quantum mechanics , geometry , mathematics , thermodynamics
Electron spin resonance (ESR) in strongly correlated metals is an exciting phenomenon, as strong spin fluctuations in this class of materials broaden extremely the absorption line below the detection limit. In this respect, ESR observation in CeB 6 provides a unique chance to inspect Ce 3+ magnetic state in the antiferroquadrupole (AFQ) phase. We apply the original high frequency (60 GHz) experimental technique to extract the temperature and angular dependences of g -factor, line width and oscillating magnetization. Experimental data show unambiguously that the modern ESR theory in the AFQ phase considering the Γ 8 ground state of Ce 3+ ion completely fails to predict both the g -factor magnitude and its angular dependence. Alignment of the external magnetic field along [100] axis induces a strong (more than twofold) broadening of ESR line width with respect to the other crystallographic directions and results also in the anomalous temperature dependences of the g -factor and oscillating magnetization. In this experimental geometry the latter parameter surprisingly exceeds total static magnetization by 20% at T * ~ 2.5 K. We argue that the unusual physical picture of ESR in CeB 6 may be strongly affected by spin fluctuations and dynamic collective effects predominantly pronounced in [100] direction.