ESR of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>in the intermediate-valence<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YbInCu</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>an

Rettori, C.; Oseroff, S. B.; Rao, D.; Pagliuso, P. G.; Barberis, G. E.; Sarrao, J. L.; Fisk, Z.; Hundley, M. F.

doi:10.1103/physrevb.55.1016

Cited by 39 publications

(32 citation statements)

References 37 publications

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“…The optical conductivity is Drude like, with an additional structure in the mid-infrared range which appears quite suddenly at T v (Garner et al, 2000). The ESR data (Rettori et al, 1997) indicate a large density of states at the fermi level E F . Neither the susceptibility, nor the resistivity, nor the Hall constant show any temperature dependence below T v , i.e., the system behaves as a fermi liquid with a characteristic energy scale T F L ≫ T v .…”

Section: 85+mentioning

confidence: 83%

Exact dynamical mean-field theory of the Falicov-Kimball model

2003

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The Falicov-Kimball model was introduced in 1969 as a statistical model for metal-insulator transitions; it includes itinerant and localized electrons that mutually interact with a local Coulomb interaction and is the simplest model of electron correlations. It can be solved exactly with dynamical mean-field theory in the limit of large spatial dimensions which provides an interesting benchmark for the physics of locally correlated systems. In this review, we develop the formalism for solving the Falicov-Kimball model from a path-integral perspective, and provide a number of expressions for single and two-particle properties. We examine many important theoretical results that show the absence of fermi-liquid features and provide a detailed description of the static and dynamic correlation functions and of transport properties. The parameter space is rich and one finds a variety of many-body features like metal-insulator transitions, classical valence fluctuating transitions, metamagnetic transitions, charge density wave order-disorder transitions, and phase separation. At the same time, a number of experimental systems have been discovered that show anomalies related to Falicov-Kimball physics [including YbInCu 4 , EuNi 2 (Si 1−x Gex) 2 , NiI 2 and TaxN].

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Section: 85+mentioning

confidence: 83%

Exact dynamical mean-field theory of the Falicov-Kimball model

2003

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“…31 ii) the trigger of the Korringa mechanism in Regions II and III is due to the presence of mobile activated conduction-carriers at the Fermi level, which are responsible for the momentum transfer between the conduction-carriers and the localized magnetic moment via the exchange coupling, J f d (q = 0); 30,31 and iii) in the metallic Regions II and III, there is no qdependence of the exchange interaction, i.e.,…”

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confidence: 99%

Thermally activated exchange narrowing of the Gd3+ESR fine structure in a single crystal of Ce1−xGd
Garcia
¹
,
Venegas
²
,
Pagliuso
³

et al. 2011
Phys. Rev. B
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We report electron spin resonance (ESR) measurements in the Gd 3+ doped semiconducting filled skutterudite compound Ce1−xGdxFe4P12 (x ≈ 0.001). As the temperature, T , varies from T ≃ 150 K to T ≃ 165 K the Gd 3+ ESR fine and hyperfine structures coalesce into a broad inhomogeneous single resonance. At T ≃ 200 K the line narrows and as T increases further the resonance becomes homogeneous with a thermal broadening of 1.1(2) Oe/K. These results suggest that the origin of these features may be associated to a subtle interdependence of thermally activated mechanisms that combine: i) an increase with T of the density of activated conduction-carriers across the Tdependent semiconducting pseudogap; ii) the Gd 3+ Korringa relaxation process due to an exchange interaction, J f d S.s, between the Gd 3+ localized magnetic moments and the thermally activated conduction-carriers and; iii) a relatively weak confining potential of the rare-earth ions inside the oversized (Fe2P3)4 cage, which allows the rare-earths to become rattler Einstein oscillators above T ≈ 148 K. We argue that the rattling of the Gd 3+ ions, via a motional narrowing mechanism, also contributes to the coalescence of the ESR fine and hyperfine structure.

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“…The density of states associated to the Sommerfeld coefficient derived above may be written as tot (12) states/eV-1 mol-spin. As found for isomorphous compounds, 7,8,28 we may expect the ratio ͗J f s 2 (q)͘ 1/2 /J f s (0) to be the same in the Cu-and Ni-based compounds. To the best of our knowledge there is no calculation that take into consideration the q dependence of exchange interaction between localized spins and d-conduction electrons.…”

Section: Analysis and Discussionmentioning

confidence: 91%

“…Thus, by taking into consideration the q dependence of the exchange interaction only, Eqs. ͑1͒ and ͑2͒ may be combined to give: 8,19 b…”

Section: Analysis and Discussionmentioning

confidence: 99%

Electron spin resonance ofGd3+andNd3+
Pagliuso
¹
,
Rettori
²
,
Sarrao
³

et al. 1999
Phys. Rev. B
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Low-temperature (1.6 KՇTՇ60 K) data of electron spin resonance for Gd 3ϩ and Nd 3ϩ diluted in LuInA 4 (AϭCu,Ni) compounds are presented. The results are interpreted in terms of a density of states at the Fermi level built up of a single s band for the Cu-based system and a multiple (s and d) bands for the Ni-based system. The susceptibility and specific heat data show negligible electron-electron exchange enhancement for both compounds. For the Cu-based system the exchange interaction between the rare-earth (Gd 3ϩ and Nd 3ϩ ) local moment and the conduction electrons depends on the conduction-electron wave vector.

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ESR ofGd3+in the intermediate-valenceYbInCu4an

Cited by 39 publications

References 37 publications

Exact dynamical mean-field theory of the Falicov-Kimball model

Exact dynamical mean-field theory of the Falicov-Kimball model

Thermally activated exchange narrowing of the Gd3+ESR fine structure in a single crystal of Ce1−xGd
Garcia
¹
,
Venegas
²
,
Pagliuso
³

et al. 2011
Phys. Rev. B
Self Cite

Electron spin resonance ofGd3+andNd3+
Pagliuso
¹
,
Rettori
²
,
Sarrao
³

et al. 1999
Phys. Rev. B
Self Cite
18
0
10
0
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ESR ofGd3+in the intermediate-valenceYbInCu4an

Cited by 39 publications

References 37 publications

Exact dynamical mean-field theory of the Falicov-Kimball model

Exact dynamical mean-field theory of the Falicov-Kimball model

Thermally activated exchange narrowing of the Gd3+ESR fine structure in a single crystal of Ce1−xGdGarcia1, Venegas2, Pagliuso3 et al. 2011Phys. Rev. BSelf Cite

Electron spin resonance ofGd3+andNd3+Pagliuso1, Rettori2, Sarrao3 et al. 1999Phys. Rev. BSelf Cite180100View full textAdd to dashboardCite

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Thermally activated exchange narrowing of the Gd3+ESR fine structure in a single crystal of Ce1−xGd
Garcia
¹
,
Venegas
²
,
Pagliuso
³

et al. 2011
Phys. Rev. B
Self Cite

Electron spin resonance ofGd3+andNd3+
Pagliuso
¹
,
Rettori
²
,
Sarrao
³

et al. 1999
Phys. Rev. B
Self Cite
18
0
10
0
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