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

Autor: Ai Nakamura, Yoshichika Ōnuki, Dai Aoki, Keigo Okauchi, Tetsuya Takeuchi, Yosuke Ashitomi, Fuminori Honda, Yoshiki Sato, J. Valenta, Masato Hedo, Vladimír Sechovský, Takao Nakama, Hiromu Akamine, Jiri Prchal

Publikováno v: Physica B: Condensed Matter. 536:182-191

A pressure-induced valence transition has attracted much attention in Eu-compounds. Among them, EuRh2Si2, EuNi2Ge2, and EuCo2Ge2 reveal the valence transition around 1, 2, and 3 GPa, respectively. We have succeeded in growing single crystals of EuT2X

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e25e5e523f4d4204b9a1e210977efcc7
https://doi.org/10.1016/j.physb.2017.09.094

Divalent, trivalent, and heavy fermion states in Eu compounds

Autor: Masato Hedo, Yoshichika Ōnuki, Ai Nakamura, Hiroyuki Shiba, Miho Nakashima, Yousuke Ashitomi, Yasushi Amako, Hisatomo Harima, K Tomori, Takao Nakama, Kazuyuki Matsubayashi, T. Tekeuchi, Katsuya Shimizu, Yoshiya Uwatoko, Shuei Kayama, Tomoko Kagayama, Fuminori Honda, Daniel Braithwaite, S. Esakki Muthu, Dai Aoki, Bernard Salce, Tomoyuki Yara, Hiromu Akamine

Publikováno v: Philosophical Magazine
Philosophical Magazine, Taylor & Francis, 2017, 97 (36), pp.3399-3414
Philosophical Magazine, 2017, 97 (36), pp.3399-3414

Most of the Eu compounds are in the divalent (Eu) electronic state and order magnetically. On the other hand, the Eu-trivalent (Eu) compounds exist but are small in number. An energy difference between the Eu and Eu states is, however, not extremely

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1d1ebf4483b1112ad9c0a3fc7f533beb
https://hal.archives-ouvertes.fr/hal-02010000

Unique Pressure versus Temperature Phase Diagram for Antiferromagnets Eu2Ni3Ge5and EuRhSi3

Autor: Masayuki Hagiwara, Yoshichika Ōnuki, Masato Hedo, Tetsuya Takeuchi, Hiromu Akamine, Tomoyuki Yara, Kiyohiro Sugiyama, Yoshinori Haga, Yosuke Ashitomi, Takao Nakama, Masato Nada, Yoshiya Uwatoko, K Tomori, Kazuyuki Matsubayashi, Ai Nakamura, Miho Nakashima, Yasushi Amako

Publikováno v: Journal of the Physical Society of Japan. 86:034708

We studied the magnetic properties of the antiferromagnets Eu2Ni3Ge5 and EuRhSi3 by measuring their electrical resistivity, specific heat, magnetic susceptibility, magnetization, and thermoelectric power, together with the electrical resistivities at

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ae2586430cd1e53200f584ba4e5bc096
https://doi.org/10.7566/jpsj.86.034708

Pressure-Induced Valence Transition and Characteristic Electronic States in EuRh2Si2

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

Publikováno v: Journal of the Physical Society of Japan. 85:063701

EuRh2Si2 is well known to show a valence transition at a pressure of about 1 GPa from a Eu-divalent (antiferromagnetic) state to a nearly Eu-trivalent (paramagnetic) state, which was clarified using polycrystalline samples. We have succeeded in growi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4024ec5c1ccc2e6ddd968200e8a26fa3
https://doi.org/10.7566/jpsj.85.063701

Pressure-Induced Valence Transition and Heavy Fermion State in Eu2Ni3Ge5 and EuRhSi3

Autor: Katsuya Shimizu, Yoshichika Ōnuki, Takao Nakama, Shuei Kayama, Tomoko Kagayama, Taro Uejo, Ai Nakamura, Miho Nakashima, Yoshiya Uwatoko, Tomoya Okazaki, Yasushi Amako, Hiromu Akamine, Masato Hedo, Hiroyuki Shiba, Kazuyuki Matsubayashi

Publikováno v: Journal of the Physical Society of Japan. 84:053701

We succeeded in growing single crystals of Eu2Ni3Ge5 and EuRhSi3 by the In-flux method, and measured the electrical resistivity under pressures. Both compounds are Eu-divalent antiferromagnets with the Neel temperatures TN = 18.6 and 47.7 K, respecti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7b5ad90ca7624243162998151966a3f5
https://doi.org/10.7566/jpsj.84.053701