Anomalous spin relaxation and quantum criticality in Mn1 − x Fe x Si solid solutions

Demishev, S. V.; Samarin, A. N.; Ġlushkov, V. V.; Gilmanov, M. I.; Lobanova, I. I.; Samarin, N. A.; Semeno, A. V.; Sluchanko, N. E.; Chubova, N. M.; Dyadkin, Vadim; Grigoriev, S. V.

doi:10.1134/s0021364014130025

Cited by 20 publications

(27 citation statements)

References 16 publications

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“…3b,e). It is known that the ESR line width in various strongly correlated materials may be controlled by spin fluctuations123420 so it is possible to suppose that the same mechanism works in CeB 6 . Spin fluctuations may also affect magnetic scattering in CeB 6 , which is damped by applied magnetic field leading to negative magnetoresistance.…”

Section: Discussionmentioning

confidence: 99%

Magnetic resonance anisotropy in CeB6: an entangled state of the art

Semeno

Gilmanov

Bogach

et al. 2016

Sci Rep

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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 CeB6 provides 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 Γ8 ground 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 CeB6 may be strongly affected by spin fluctuations and dynamic collective effects predominantly pronounced in [100] direction.

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Section: Discussionmentioning

confidence: 99%

Magnetic resonance anisotropy in CeB6: an entangled state of the art

Semeno

Gilmanov

Bogach

et al. 2016

Sci Rep

Self Cite

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“…As scattering on spin fluctuations dominates in Mn 1−x Fe x Si [8,14,15], it is reasonable to suppose that this mechanism affects equally on electrons and holes providing constant ratio of their mobilities and relaxation times. Because spin fluctuations control also the electron spin resonance linewidth [15,25] (stars in Fig. 3b) demonstrates evident correlation between τ S (x) and τ (x) behavior (Fig.…”

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confidence: 99%

“…So the factors driving the change in the topology of magnetic subsystem need to be clarified. Thirdly, despite the fact that the Mn 1−x Fe x Si solid solutions are often considered as itinerant magnets [9,10], LDA calculations [13] and recent magnetic resonance and magnetoresitance studies [14,15] favor the alternative explanation based on Heisenberg LMM of Mn ions. Therefore, different behavior of the Hall effect in QC systems with LMM and itinerant magnets [1][2][3] makes it possible to shed more light on the microscopic mechanisms of quantum criticality in Mn 1−x Fe x Si.…”

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confidence: 99%

“…Generally, magnetic interactions in 3d-metals are not described by RKKY approach due to itinerant origin of magnetism [26]. However, if LMMs of Mn are either postulated or deduced for Mn 1−x Fe x Si from experiment and theory [13][14][15]23], they have to interact via the RKKY exchange. In this case, the exchange energies can be estimated assuming quadratic isotropic dispersion laws for electrons and holes.…”

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confidence: 99%

“…Heisenberg picture of magnetism in MnSi and Mn 1−x Fe x Si suggested from magnetic resonance [14,15,23], magnetoresistance data [14] and the LDA calculations [13] predicts the modulation of exchange interactions under substitution of Mn with Fe. Generally, magnetic interactions in 3d-metals are not described by RKKY approach due to itinerant origin of magnetism [26].…”

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confidence: 99%

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