Metamagnetic Behavior in Heavy-Fermion Compound YbIr2Zn20

被引：43

作者：

Takeuchi, Tetsuya ^{[1
]}

Yasui, Shinichi ^{[2
]}

Toda, Masatoshi ^{[2
]}

Matsushita, Masaki ^{[2
]}

Yoshiuchi, Shingo ^{[2
]}

Ohya, Masahiro ^{[2
]}

Katayama, Keisuke ^{[2
]}

Hirose, Yusuke ^{[2
]}

Yoshitani, Naohisa ^{[2
]}

Honda, Fuminori ^{[2
]}

Sugiyama, Kiyohiro ^{[2
]}

Hagiwara, Masayuki ^{[3
]}

Kindo, Koichi ^{[4
]}

Yamamoto, Etsuji ^{[5
]}

Haga, Yoshinori ^{[5
]}

Tanaka, Toshiki

Kubo, Yasunori ^{[6
]}

Settai, Rikio ^{[2
]}

Onuki, Yoshichika ^{[2
,5
]}

机构：

[1] Osaka Univ, Low Temp Ctr, Osaka 5600043, Japan

[2] Osaka Univ, Grad Sch Sci, Osaka 5600043, Japan

[3] Osaka Univ, KYOKUGEN, Osaka 5608531, Japan

[4] Univ Tokyo, ISSP, Chiba 2778581, Japan

[5] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[6] Nihon Univ, Coll Humanities & Sci, Dept Phys, Setagaya Ku, Tokyo 1568550, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2010年 / 79卷 / 06期

关键词：

YbIwr(2)Zn(20); itinerant electron metamagnetism; dHvA; magnetostriction; thermal expansion; magneto-resistance; CERU2SI2; TRANSITION; SUPERCONDUCTIVITY; MAGNETIZATION; DEGENERACY; SYSTEMS; FIELDS; RH; RU; CO;

D O I：

10.1143/JPSJ.79.064609

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The metamagnetic behavior in the heavy-fermion compound YbIr2Zn20 with a cubic structure was studied by magnetization, de Haas-van Alphen (dHvA) oscillation, magnetoresistance, specific heat, thermal expansion, and magnetostriction measurements in single-crystalline samples. A metamagnetic anomaly at H-m similar or equal to 100 kOe was found to exist in all field directions in the cubic crystal structure. The cyclotron effective mass m(c)*, the coefficient A in the Fermi liquid relation of electrical resistivity rho = rho(0) + AT(2), and the electronic specific heat coefficient C/T indicate a peak at the metamagnetic field H-m. The negative thermal expansion and negative volume magnetostriction suggest that the valence of the Yb ion gradually changes from a 4f-itinerant state to a trivalent state with increasing magnetic field, and an almost trivalent state is realized above the metamagnetic field H-m. On the other hand, the topology of the Fermi surface is approximately unchanged below and above H-m in the dHvA experiment.

引用

页数：15

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