Pressure-Induced Valence Transition and Characteristic Electronic States in EuRh<sub>2</sub>Si<sub>2</sub>

Honda, Fuminori; Okauchi, Keigo; Nakamura, Ai; Li, Dexin; Aoki, Dai; Akamine, Hikaru; Ashitomi, Yousuke; Hedo, Masato; Nakama, Takao; Ōnuki, Yoshichika

doi:10.7566/jpsj.85.063701

Cited by 35 publications

(13 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In EuRh 2 Si 2 , the magnetic susceptibility data at µ 0 H = 1 T exhibit anisotropic features below about 100 K (≫ T N = 23.8 K), and the anisotropy ratio becomes χ [100] /χ [001] ≃ 2.5 at 1.8 K. In addition, the magnetization curves also show a large anisotropy, which is reflected in the difference of saturation magnetic fields: H [100] c ≃ 2.5 T and H [001] c ≃ 10 T. Note that the anisotropic magnetism was also reported for other Eu-based ThCr 2 Si 2 compounds such as EuCo 2 Ge 2 [8,9], EuRh 2 Ge 2 [10], EuIr 2 Si 2 [11], and EuNi 2 Ge 2 [10]. Among these compounds, the pressure-induced valence transition was observed in EuRh 2 Si 2 [2,3], EuNi 2 Ge 2 [12,13], and EuCo 2 Ge 2 [14] at P v ≃ 1, 2, and 3 GPa, respectively. It is interesting whether there is a relationship between the proximity to the valence transition and the large magnetic anisotropy or not, and this is left as a future study.…”

Section: Resultsmentioning

confidence: 62%

“…T v increases linearly at higher pressures with increasing pressure. Recently, Honda and coworkers succeeded in growing single crystals of EuRh 2 Si 2 by the Bridgman method and studied their electronic properties by measuring the electrical resistivity under pressure [3]. The very clear firstorder transition at T v terminates at the critical end point with P CEP = 2.05 GPa and T CEP = 170 K. As for the bulk magnetic properties, much less work has been done on the single crystals of EuRh 2 Si 2 [4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic Magnetic Phase Diagrams in EuRh₂Si₂

Takeuchi

Iha

Kakihana

et al. 2020

Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena

Self Cite

View full text Add to dashboard Cite

Magnetic properties of EuRh 2 Si 2 were studied using single crystal samples grown by the Bridgman method. The temperature dependence of magnetic susceptibility and magnetization show large anisotropy at low temperatures, although the Eu ions in EuRh 2 Si 2 are divalent with the pure spin state of S = 7/2 and L = 0. In addition, the magnetic field effect on the antiferromagnetic ordering temperature T N is also very anisotropic, resulting in anisotropic magnetic field versus temperature (H − T) phase diagrams between H ∥ [100] and [001].

show abstract

Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Anisotropic Magnetic Phase Diagrams in EuRh₂Si₂

Takeuchi

Iha

Kakihana

et al. 2020

Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena

Self Cite

View full text Add to dashboard Cite

show abstract

“…In these compounds the Eu valence change dramatically in comparison with the most Ce-and Yb-based compounds in the same temperature region [74,75]. Usually, the FOVT transition is observed in such systems [76,77]. The phase diagram of YbNiC 2 also has a form similar to the well-known YbInCu 4 compound mentioned in Sec.…”

Section: Discussion Of the Resultsmentioning

confidence: 70%

Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion YbNiC2

et al. 2021

View full text Add to dashboard Cite

We present studies of neutron diffraction, electrical resistivity, magnetic susceptibility, magnetization, and specific heat of noncentrosymmetric YbNiC 2 . At normal pressure, YbNiC 2 is a moderate heavy-fermion compound with Kondo lattice. At 16 K we observe an anomaly in the temperature dependence of specific heat which is ascribed to an abrupt valence change of Yb ions. At pressures above 7 GPa, the valence change and the Kondo lattice state are suppressed, and near a temperature of 10 K we detect the appearance of magnetic order. Above 5 GPa, the temperature dependence of the resistivity behaves similarly to other compounds of the CeNiC 2 -type family, indicating the formation of charge density waves. This is attributed to the nesting properties of the Fermi surface (FS) found within the density functional theory + dynamical mean field theory treatment. Our ab initio calculations also show that the valence of Yb in YbNiC 2 at normal conditions is 2.85, which increases with temperature and pressure. The FS of YbNiC 2 is anisotropic in shape in comparison with the 3D surface of YbCoC 2 .

show abstract

“…Polycrystalline samples of Eu(Rh 1-x Co x ) 2 Si 2 for x = 0.4 and Eu(Rh 1-x Ir x ) 2 Si 2 for x = 0.4, 0.5 were grown by argon arc melting [11,12]. A single crystal of EuRh 2 Si 2 was grown by the Bridgman method [15].…”

Section: Methodsmentioning

confidence: 99%

Electronic Structure of the Valence Transition System Eu(Rh₁₋_xT_x)₂Si₂ (T = Co, Ir) Studied by High-Energy Resolution Fluorescence Detection X-Ray Absorption Spectroscopy

Shimokasa

Kawamura

Taku

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

Self Cite

View full text Add to dashboard Cite

The electronic structure of Eu(Rh 1-x T x) 2 Si 2 (T = Co, Ir) showing a valence change with temperature has been investigated by means of high-energy resolution fluorescence detection X-ray absorption spectroscopy (HERFD-XAS). The Eu L 3-edge HERFD-XAS spectra for Eu(Rh 1-x T x) 2 Si 2 distinctly demonstrate that, due to the improvement of the energy resolution, the intensities of Eu 2+ and Eu 3+ components are dependent on temperature. Each component has additional fine structures, which clearly change above and below the transition temperature. These spectral changes are similar to those for EuNi 2 (Si 1-x Ge x) 2 , but the degree of temperature dependence on energy difference between Eu 2+ and Eu 3+ components is different from EuNi 2 (Si 1-x Ge x) 2. The results of this study suggest that a treatment of the many-body interaction is essential to understanding the valence transition of Eu compounds.

show abstract

Pressure-Induced Valence Transition and Characteristic Electronic States in EuRh₂Si₂

Cited by 35 publications

References 18 publications

Anisotropic Magnetic Phase Diagrams in EuRh₂Si₂

Anisotropic Magnetic Phase Diagrams in EuRh₂Si₂

Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion YbNiC2

Electronic Structure of the Valence Transition System Eu(Rh₁₋_xT_x)₂Si₂ (T = Co, Ir) Studied by High-Energy Resolution Fluorescence Detection X-Ray Absorption Spectroscopy

Contact Info

Product

Resources

About

Pressure-Induced Valence Transition and Characteristic Electronic States in EuRh2Si2

Cited by 35 publications

References 18 publications

Anisotropic Magnetic Phase Diagrams in EuRh2Si2

Anisotropic Magnetic Phase Diagrams in EuRh2Si2

Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion YbNiC2

Electronic Structure of the Valence Transition System Eu(Rh1−xTx)2Si2 (T = Co, Ir) Studied by High-Energy Resolution Fluorescence Detection X-Ray Absorption Spectroscopy

Contact Info

Product

Resources

About

Pressure-Induced Valence Transition and Characteristic Electronic States in EuRh₂Si₂

Anisotropic Magnetic Phase Diagrams in EuRh₂Si₂

Anisotropic Magnetic Phase Diagrams in EuRh₂Si₂

Electronic Structure of the Valence Transition System Eu(Rh₁₋_xT_x)₂Si₂ (T = Co, Ir) Studied by High-Energy Resolution Fluorescence Detection X-Ray Absorption Spectroscopy