Magnetic phase separation in europium hexaboride and its relation to the Kondo interaction

Altshuler, T. S.; Goryunov, Yu. V.; Dukhnenko, A. V.; Shitsevalova, N. Yu.

doi:10.1134/s0021364008150174

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…24 Later the positions of two ESR lines have been explained by so-called Kondo and anti-Kondo effects. 10 It is worth noting that the considered interpretation is essentially based on the observation of two ESR peaks with comparable magnitudes. 10,24 The results of the present work unambiguously show that the double peak structure is most likely a consequence of the macroscopic gradient of the magnetic induction in the sample thus putting into question the explanation based on the microscopic effect of magnetic phase separation.…”

Section: Discussionmentioning

confidence: 99%

“…10 It is worth noting that the considered interpretation is essentially based on the observation of two ESR peaks with comparable magnitudes. 10,24 The results of the present work unambiguously show that the double peak structure is most likely a consequence of the macroscopic gradient of the magnetic induction in the sample thus putting into question the explanation based on the microscopic effect of magnetic phase separation. Indeed in all experimental situations where ESR in EuB 6 occurred in condition of homogeneous magnetic field in the sample the spectrum consisted of a single line having width noticeably less than in the case of inhomogeneous magnetic field ͑Figs.…”

Section: Discussionmentioning

confidence: 99%

“…2͒, reflects the magnetic phase separation effect. 10,24 The strong shift of the visible g factor ͑Fig. 8͒ was also considered as caused by polaronic effect.…”

Section: Discussionmentioning

confidence: 99%

“…[5][6][7][8][9][10] The results of these studies look very controversial, e.g., the linewidth values measured in Refs. 5-10 exhibit considerable discrepancy even at high temperatures and the difference in the observed linewidth reaches several times at helium temperatures.…”

Section: Introductionmentioning

confidence: 96%

“…Additionally, some authors report a splitting of the resonance line below T C , which may be a consequence of the magnetically inhomogeneous ground state. 5,6,10 Thus, the low temperature ESR spectrum structure is not completely clear both on qualitative and quantitative levels.…”

Section: Introductionmentioning

confidence: 98%

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Electron spin resonance inEuB6

et al. 2009

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Cavity measurements of a high frequency ͑60 GHz͒ electron spin resonance ͑ESR͒ have been carried our for a single crystal of EuB 6 at temperatures 4.2-50 K in magnetic field up to 7 T, which has been aligned along ͓001͔ crystallographic direction. It is found that in the case of homogeneous magnetic field in the sample the ESR spectrum of EuB 6 is formed by a single line at all temperatures including the ferromagnetic ordering region, whereas the gradient of magnetic field in the samples induces double peak ESR structure at low temperatures. For the quantitative description of the ESR line shape we suggested an analytical approach applicable for the cavity measurements of a metal with an arbitrary value of magnetic permeability including strongly magnetic case and obtained full set of the ESR parameters, namely oscillating magnetization M 0 , g factor, and linewidth. Our analysis has explained the visible resonance line shift and revealed the coincidence of the oscillating magnetization defining the resonance amplitude with the static magnetization. The anomalous growth of the linewidth below Curie temperature T C Ϸ 15 K is observed. We argue that ESR in EuB 6 is not considerably affected by either interaction with the spin polarons or the magnetic phase separation and reflects merely the oscillation of the Eu 2+ localized magnetic moments, which can be well understood within meanfield approximation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…2͒, reflects the magnetic phase separation effect. 10,24 The strong shift of the visible g factor ͑Fig. 8͒ was also considered as caused by polaronic effect.…”

Section: Discussionmentioning

confidence: 99%