Kondo Lattice Behavior in the Valence Fluctuating Systems α- and β-YbAlB4

被引：1

作者：

Matsumoto, Yosuke ^{[1
]}

Kuga, Kentaro ^{[1
]}

Horie, Naoki ^{[1
]}

Nakatsuji, Satoru ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2011年 / 80卷

关键词：

heavy fermions; intermediate valence; quantum criticality; Yb system; QUANTUM CRITICALITY;

D O I：

10.1143/JPSJS.80SA.SA090

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have measured specific heat and magnetization of the Yb-based heavy Fermion systems alpha-YbAlB4 and beta-YbAlB4 alpha-YbAlB4 is a locally isostructural polymorph of the first example of an Yb-based heavy Fermion superconductor beta-YbAlB4, which exhibits pronounced non-Fermi-liquid behavior above the superconducting transition temperature T-c = 80 mK. The results reveal a Fermi liquid ground state for alpha-YbAlB4 in contrast to the quantum criticality found for beta-YbAlB4. Interestingly, both systems exhibit Kondo lattice behavior with its characteristic temperature scale T* similar to 8 K, despite of their strongly intermediate valence with the temperature scale of similar to 200 K. We discuss the origin of this unusual behavior, making a comparison with the typical mixed valent compound YbAl3. Large Wilson ratios indicate the existence of ferromagnetic correlation as a possible origin for the Kondo lattice behavior.

引用

页数：3

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