Field-dependent collective ESR mode in YbRh 2 Si 2

Holanda, L. M.; Duque, Juan G.; Bittar, E. M.; Adriano, C.; Pagliuso, P. G.; Rettori, C.; Hu, Rongwei; Petrović, C.; MaQuilon, Samuel; Fisk, Z.; Hùber, D. L.; Oseroff, S. B.

doi:10.1016/j.physb.2009.07.024

Cited by 5 publications

(5 citation statements)

References 38 publications

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“…Since both the collective mode approach [11], the unlike-spin quasiparticle model [13][14][15] and the theory outlined in [16] can account for the temperature dependence of the g-shift in YbRh 2 Si 2 at low fields [6,9], a question arises as to whether there is a fundamental connection between the various approaches. In particular, is the ln(βT) factor in equation (10) an approximation to the susceptibility term in equation (11) ?…”

Section: Discussionmentioning

confidence: 99%

“…According to [9,20], the magnetic susceptibilities show Curie-Weiss-like behavior above 2 K. For the sample studied in [9], the behavior over the range 2 K < T < 14 K could be characterized by negative Curie temperatures M ⊥ = 1.5 K (inferred from the measured susceptibility) and M = 1.1 K (inferred from the temperature dependence of the g-factor). Assuming similar Curie-Weiss behavior for χ S and χ S ⊥ with negative spin Curie temperatures denoted by S and S ⊥ , equation ( 5) reduces to…”

Section: Unlike-spin Analysismentioning

confidence: 97%

“…Subsequent studies have explored various aspects of the resonance, including the effects of Ge doping [2], the origin of the residual line width [3], the local and itinerant properties of the ESR [4] and the anisotropy of the line width [5]. Other studies have focused on high-field behavior [6] and the bottleneck-like characteristics of the ESR spectra [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Electron spin resonance in Y bRh₂Si₂: local-moment, unlike-spin and quasiparticle descriptions

Hùber

2012

J. Phys.: Condens. Matter

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Electron spin resonance (ESR) in the Kondo lattice compound YbRh(2)Si(2) has stimulated discussion as to whether the low-field resonance outside the Fermi liquid regime in this material is more appropriately characterized as a local-moment phenomenon or one that requires a Landau quasiparticle interpretation. In earlier work, we outlined a collective mode approach to the ESR that involves only the local 4f moments. In this paper, we extend the collective mode approach to a situation where there are two subsystems of unlike spins: the pseudospins of the ground multiplet of the Yb ions and the spins of the itinerant conduction electrons. We assume a weakly anisotropic exchange interaction between the two subsystems. With suitable approximations our expression for the g-factor also reproduces that found in recent unlike-spin quasiparticle calculations. It is pointed out that the success of the local-moment approach in describing the resonance is due to the fact that the susceptibility of the Yb subsystem dominates that of the conduction electrons with the consequence that the relative shift in the resonance frequency predicted by the unlike-spin models (and absent in the local-moment models) is ≪ 1. The connection with theoretical studies of a two-component model with like spins is also discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Unlike-spin Analysismentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Electron spin resonance in Y bRh₂Si₂: local-moment, unlike-spin and quasiparticle descriptions

Hùber

2012

J. Phys.: Condens. Matter

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“…However, it is interesting to note that the small difference θ ⊥ − θ may be the origin of the weak temperature dependence of g(T ) below 6 K, see figure 3(b). The molecular magnetic field description of the anisotropic Yb-Yb interaction by Huber [14,16] provides a link between the g-factor and the exchange anisotropy which is reflected in θ ⊥ − θ :…”

Section: Esr-intensity and Its Temperature Dependencementioning

confidence: 99%

Anisotropic electron spin resonance of Y bIr₂Si₂

Gruner

Wykhoff

Sichelschmidt

et al. 2010

J. Phys.: Condens. Matter

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A series of electron spin resonance (ESR) experiments were performed on a single crystal of the heavy fermion metal Y bIr₂Si₂ to map out the anisotropy of the ESR-intensity I(ESR) which is governed by the microwave field component of the g-factor. The temperature dependencies of I(ESR)(T) and g(T) were measured for different orientations and compared within the range 2.6 K ≤ T ≤ 16 K. The analysis of the intensity dependence on the crystal orientation with respect to both the direction of the microwave field and the static magnetic field revealed remarkable features: the intensity variation with respect to the direction of the microwave field was found to be one order of magnitude smaller than expected from the g-factor anisotropy. Furthermore, we observed a weak basal plane anisotropy of the ESR parameters which we interpret to be an intrinsic sample property.

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“…difference θ ⊥ − θ may be the origin of the weak temperature dependence of g(T ) below 6K, see figure 3(b). The molecular magnetic field description of the anisotropic Yb-Yb interaction by Huber [14,16] provides a link between the g-factor and the exchange anisotropy which is reflected in θ ⊥ − θ :…”

Section: Esr-intensity and Its Temperature Dependencementioning

confidence: 99%

Anisotropic electron spin resonance of YbIr2Si2

Gruner,

Wykhoff,

Sichelschmidt

et al. 2010

Preprint

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A series of electron spin resonance (ESR) experiments were performed on a single crystal of the heavy fermion metal YbIr 2 Si 2 to map out the anisotropy of the ESR-intensity I ESR which is governed by the microwave field component of the gfactor. The temperature dependencies of I ESR (T ) and g(T ) were measured for different orientations and compared within the range 2.6 K ≤ T ≤ 16 K. The analysis of the intensity dependence on the crystal orientation with respect to both the direction of the microwave field and the static magnetic field revealed remarkable features: The intensity variation with respect to the direction of the microwave field was found to be one order of magnitude smaller than expected from the g-factor anisotropy. Furthermore, we observed a weak basal plane anisotropy of the ESR parameters which we interpret to be an intrinsic sample property.

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Field-dependent collective ESR mode in YbRh 2 Si 2

Cited by 5 publications

References 38 publications

Electron spin resonance in Y bRh₂Si₂: local-moment, unlike-spin and quasiparticle descriptions

Electron spin resonance in Y bRh₂Si₂: local-moment, unlike-spin and quasiparticle descriptions

Anisotropic electron spin resonance of Y bIr₂Si₂

Anisotropic electron spin resonance of YbIr2Si2

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Field-dependent collective ESR mode in YbRh 2 Si 2

Cited by 5 publications

References 38 publications

Electron spin resonance in Y bRh2Si2: local-moment, unlike-spin and quasiparticle descriptions

Electron spin resonance in Y bRh2Si2: local-moment, unlike-spin and quasiparticle descriptions

Anisotropic electron spin resonance of Y bIr2Si2

Anisotropic electron spin resonance of YbIr2Si2

Contact Info

Product

Resources

About

Electron spin resonance in Y bRh₂Si₂: local-moment, unlike-spin and quasiparticle descriptions

Electron spin resonance in Y bRh₂Si₂: local-moment, unlike-spin and quasiparticle descriptions

Anisotropic electron spin resonance of Y bIr₂Si₂