Susceptibility of Interconfiguration-Fluctuation Compounds

Sales, B. C.; Wohlleben, D.

doi:10.1103/physrevlett.35.1240

Cited by 363 publications

(160 citation statements)

References 10 publications

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“…On the other hand, magnetic susceptibility at low magnetic field (50 Oe) reveals a broad maximum typical of MV state [6]. However, further studies of the magnetic susceptibility (unpublished) revealed that its values are too high to follow the model proposed by Sales and Wohlleben [7] for MV state. In fact, a presence of ferromagnetic impurities in a specimen may be a source of the enlarged value of susceptibility.…”

Section: Introductionmentioning

confidence: 87%

Electronic structure and transport properties of CeNi9In2

Kurleto

Starowicz

Goraus

et al. 2015

Solid State Communications

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We investigated CeNi 9 In 2 compound, which has been considered as a mixed valence (MV) system. Electrical resistivity vs. temperature variation was analysed in terms of the model proposed by Freimuth for systems with unstable 4f shell. At low temperature the resistivity dependence is consistent with a Fermi liquid state with a contribution characteristic of electron-phonon interaction. Ultraviolet photoemission spectroscopy (UPS) studies of the valence band did not reveal a Kondo peak down to 14 K. A difference of the spectra obtained with photon energies of low and high photoionization cross sections for Ce 4f electrons indicated that 4f states are located mainly close to the Fermi energy. The peaks related to f 5/2 1 and f 7/2 1 final states cannot be resolved but form a plateau between -0.3 eV and the Fermi energy. X-ray photoemission spectroscopy (XPS) studies were realized for the cerium 3d level. The analysis of XPS spectra within the Gunnarsson-Shönhammer theory yielded a hybridization parameter of 104 meV and non-integer f level occupation, being close to 3. Calculations of partial densities of states were realized by a full potential local orbital (FPLO) method. They confirm that the valence band is dominated by Ni 3d states and are in general agreement with the experiment except for the behavior of f-electrons.

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Section: Introductionmentioning

confidence: 87%

Electronic structure and transport properties of CeNi9In2

Kurleto

Starowicz

Goraus

et al. 2015

Solid State Communications

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“…2) We want now to discuss the possibility of interconfiguration fluctuations (ICF) such as those proposed by Hirst [78] and Sales and Wohlleben [79] for rare earth compounds. This model was used to analyze the XPS spectra of the thulium compounds TmSe and TmTe, where the lines corresponding to the 4f 12 and 4f " configurations are found side by side [80].…”

Section: Interpretation Of the Maximum Of Y At Thementioning

confidence: 99%

“…Third, one should insist upon the fact that the observed magnetic susceptibility of mixed-valence rare earth compounds has been justified by the ICF model in a phenomenological way only [79], and that the quantitative demonstration of this behaviour is given starting from the Friedel-Anderson virtual bound state (VBS) model [83]. The relative validity of ICF and VBS models has been recently discussed by Hirst [84] and by Coqblin et al [85].…”

Section: Interpretation Of the Maximum Of Y At Thementioning

confidence: 99%

Electronic properties of mixed uranium-thorium monosulphides (U xTh1-x)S

et al. 1976

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Résumé. 2014 Abstract. 2014 We have measured bulk magnetization, neutron magnetic scattering and specific heat between 1.5 and 300 K of mixed uranium-thorium monosulphides (UxTh1-x)S with large uranium concentrations (x ~ 0.20). Long-range ferromagnetic order is observed at low temperature for 0.43 x ~ 1, but no long-range magnetic order occurs for x 0.43. Magnetization and Curie temperature decrease linearly with uranium content. The electronic specific heat is maximum at the critical concentration xc = 0.43. Our experiments failed to reveal Schottky anomalies in specific heat or crystal-field levels by inelastic neutron scattering. Our results favour a band description rather than a localised description for uranium 5f electrons.

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“…Figure 8 shows examples of the χ(T) dependence for y = 0.13 and 0.63, which correspond to the FV and HF case, respectively. A broad maximum is visible at 400 K for y = 0.13 and in FV systems it is often interpreted using the interconfiguration fluctuation (ICF) model [22][23][24], which describes the magnetic susceptibility employing the average of the configurations 4f n and 4f n−1 , separated by the energy E ex . For the case of cerium the magnetic susceptibility is written as:…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…It should be noticed that two notations of the effective temperature are used in literature, (T + T SF ) [23] or (T 2 + T SF 2 ) 1/2 [24,26].The latter can be also interpreted as the broadening of the 4f energy levels and in principle can include different contributions to the spin fluctuations (thermal excitations, quantum mechanical fluctuations, the effect of the 4f-conduction electron hybridization). We have tested both options and similar order of parameters values has been obtained, but (T 2 + T SF 2 ) 1/2 provides clearly better quality of the fit, hence better describes the system studied.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi2(Si1-yGey)2

et al. 2017

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We report our studies of the intermediate compositions between CeNi 2 Si 2 and CeNi 2 Ge 2 , i.e., the alloys CeNi 2 (Si 1-y Ge y ) 2 by means of the thermopower, electrical resistivity, specific heat, magnetic susceptibility, and X-ray photoemission measurements. CeNi 2 Si 2 is a fluctuating valence system and CeNi 2 Ge 2 is known to show the heavy fermion behaviour. The change of the temperature dependence of the resistivity towards the typical metallic behaviour occurs below y 0.25. The transition between CeNi 2 Si 2 and CeNi 2 Ge 2 is discussed in the frames of competition between the crystal electric field and Kondo interactions. It is found that valence stabilisation occurs for Ge content y [ 0.25. The hybridization energy Δ determined from the XPS Ce 3d spectrum reflects well the behaviour of the parameter E ex obtained from the analysis of the magnetic susceptibility by the interconfiguration fluctuation model. It has been also shown that thermopower data can be successfully described employing the single ion model for 0.6 \ y \ 1.0 and two-band model including the crystal electric field splitting for y ≤ 0.25.

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Susceptibility of Interconfiguration-Fluctuation Compounds

Cited by 363 publications

References 10 publications

Electronic structure and transport properties of CeNi9In2

Electronic structure and transport properties of CeNi9In2

Electronic properties of mixed uranium-thorium monosulphides (U xTh1-x)S

Influence of chemical composition on the X-ray photoemission, thermopower, specific heat, and magnetic properties of CeNi2(Si1-yGey)2

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