title: Magnetic resonance anisotropy in CeB6: an entangled state of the art.
abstract: 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 CeB6provides a unique chance to inspect Ce3+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 Γ8ground state of Ce3+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 CeB6may be strongly affected by spin fluctuations and dynamic collective effects predominantly pronounced in [100] direction.
authors.affiliation: Moscow Institute of Physics and Technology, 9 Institutsky lane, Dolgoprudny 141700 Moscow region, Russia.|Prokhorov General Physics Institute of RAS, Vavilov street, 38, 119991 Moscow, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Semeno
authors.affiliation: Moscow Institute of Physics and Technology, 9 Institutsky lane, Dolgoprudny 141700 Moscow region, Russia.
authors.forename: M I
authors.initials: MI
authors.lastname: Gilmanov
authors.affiliation: Prokhorov General Physics Institute of RAS, Vavilov street, 38, 119991 Moscow, Russia.
authors.forename: A V
authors.initials: AV
authors.lastname: Bogach
authors.affiliation: Prokhorov General Physics Institute of RAS, Vavilov street, 38, 119991 Moscow, Russia.
authors.forename: V N
authors.initials: VN
authors.lastname: Krasnorussky
authors.affiliation: Moscow Institute of Physics and Technology, 9 Institutsky lane, Dolgoprudny 141700 Moscow region, Russia.
authors.forename: A N
authors.initials: AN
authors.lastname: Samarin
authors.affiliation: Prokhorov General Physics Institute of RAS, Vavilov street, 38, 119991 Moscow, Russia.
authors.forename: N A
authors.initials: NA
authors.lastname: Samarin
authors.affiliation: Moscow Institute of Physics and Technology, 9 Institutsky lane, Dolgoprudny 141700 Moscow region, Russia.|Prokhorov General Physics Institute of RAS, Vavilov street, 38, 119991 Moscow, Russia.
authors.forename: N E
authors.initials: NE
authors.lastname: Sluchanko
authors.affiliation: Institute for Problems of Materials Science of NASU, 3, Krzhyzhanovsky Str., Kiev 03680, Ukraine.
authors.forename: N Yu
authors.initials: NY
authors.lastname: Shitsevalova
authors.affiliation: Institute for Problems of Materials Science of NASU, 3, Krzhyzhanovsky Str., Kiev 03680, Ukraine.
authors.forename: V B
authors.initials: VB
authors.lastname: Filipov
authors.affiliation: Moscow Institute of Physics and Technology, 9 Institutsky lane, Dolgoprudny 141700 Moscow region, Russia.|Prokhorov General Physics Institute of RAS, Vavilov street, 38, 119991 Moscow, Russia.
authors.forename: V V
authors.initials: VV
authors.lastname: Glushkov
authors.affiliation: Moscow Institute of Physics and Technology, 9 Institutsky lane, Dolgoprudny 141700 Moscow region, Russia.|National Research University Higher School of Economics, Myasnitskaya street, 20, 101000 Moscow, Russia.
authors.forename: S V
authors.initials: SV
authors.lastname: Demishev