Pressure-induced valence change and moderate heavy fermion state in Eu-compounds

Honda, Fuminori; Okauchi, Keigo; Satô, Yoshiki; Nakamura, Ai; Akamine, Hikaru; Ashitomi, Yosuke; Hedo, Masato; Nakama, Takao; Takeuchi, Tetsuya; Valenta, Jaroslav; Prchal, J.; Sechovský, V.; Aoki, Dai; Ōnuki, Yoshichika

doi:10.1016/j.physb.2017.09.094

Cited by 15 publications

(2 citation statements)

References 17 publications

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“…At higher pressure, the valence transition temperature T v appears in the phase diagram instead of T N , which is rapidly raised by a rate of few tens of Kelvin per GPa. The valence transitions from close divalent at low-pressure to close trivalent at high-pressure and low-temperature are first-order ones in some case and its critical points are reported at higher pressure [2,3].…”

Section: Introductionmentioning

confidence: 96%

Antiferromagnetism and Valence Fluctuation of EuCd₁₁ at High Pressure

Kagayama

Matsuda

Shimizu

et al. 2020

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

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We have measured the electrical resistance of EuCd 11 to study the T N and valence state at higher pressure up to 30 GPa. The T N increases with pressure up to 10 GPa, as same as the previous report. At pressure above 10 GPa, the R shows a kink structure and nearly quadratic temperature dependence at a lower temperature, which is different from the behavior of the antiferromagnetic ordering region. The peak temperature increases with pressure up to around 25 GPa, and for further pressurization, the R shows a negative logarithmic dependence in two different temperature regions. Kondo-like − log T and Fermi liquid T 2 dependences of R(T) are similar to that typically seen in the heavy-fermion system in which the characteristic energy scale Kondo temperature T K is enhanced by pressure.

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Section: Introductionmentioning

confidence: 96%

Antiferromagnetism and Valence Fluctuation of EuCd₁₁ at High Pressure

Kagayama

Matsuda

Shimizu

et al. 2020

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

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“…Recent experimental activities have definitely clarified a rich variety of low-temperature properties of the Eu compounds; one can now encounter exotic antiferromagnetic orders, quantum critical phenomena, heavy fermions (HF), and valence transition or crossover phenomena in several Eu compounds, when controlling the pressure and/or the doping rate [1][2][3][4][5][6][7][8][9]. As a basis to clarify the microscopic origin of such interesting physics of the Eu system, we have introduced the Eu-based impurity Anderson model in a previous paper [10] and have shown that the total singlet ground state is realized in the entire region between the divalent and trivalent Eu ion.…”

Section: Introductionmentioning

confidence: 99%

Field-induced local Fermi-liquid states in the underscreened Kondo model for Eu compounds

Kuniyoshi

Shiina

2023

SciPost Phys. Proc.

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We have studied an underscreened Kondo model for the impurity spin S=7/2S=7/2 capturing the 4f4f characteristics of a nearly divalent Eu ion. By using the numerical renormalization group method, it is shown that an unusual heavy-fermion state is induced from the underscreened spin state when a weak crystal field is introduced. It is also found that the application of the magnetic field enhances the effective mass of the heavy fermions, reflecting the field-induced level crossing of the spin states. We will discuss the mechanism of these mass enhancements in terms of a realization of the two-stage Kondo effect.

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First Principle Mechanical and Thermodynamic Properties of Some TbX (X = S, Se) Compounds

Tripathi

Srivastava

Sanyal

2019

J Supercond Nov Magn

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Pressure-induced valence change and moderate heavy fermion state in Eu-compounds

Cited by 15 publications

References 17 publications

Antiferromagnetism and Valence Fluctuation of EuCd₁₁ at High Pressure

Antiferromagnetism and Valence Fluctuation of EuCd₁₁ at High Pressure

Field-induced local Fermi-liquid states in the underscreened Kondo model for Eu compounds

First Principle Mechanical and Thermodynamic Properties of Some TbX (X = S, Se) Compounds

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Pressure-induced valence change and moderate heavy fermion state in Eu-compounds

Cited by 15 publications

References 17 publications

Antiferromagnetism and Valence Fluctuation of EuCd11 at High Pressure

Antiferromagnetism and Valence Fluctuation of EuCd11 at High Pressure

Field-induced local Fermi-liquid states in the underscreened Kondo model for Eu compounds

First Principle Mechanical and Thermodynamic Properties of Some TbX (X = S, Se) Compounds

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Product

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Antiferromagnetism and Valence Fluctuation of EuCd₁₁ at High Pressure

Antiferromagnetism and Valence Fluctuation of EuCd₁₁ at High Pressure