Strong Valence Fluctuation in the Quantum Critical Heavy Fermion Superconductor β-YbAlB4: A Hard X-Ray Photoemission Study

被引：98

作者：

Okawa, M. ^{[1
]}

Matsunami, M. ^{[1
,2
]}

Ishizaka, K. ^{[1
]}

Eguchi, R. ^{[1
,2
]}

Taguchi, M. ^{[2
]}

Chainani, A. ^{[2
]}

Takata, Y. ^{[2
]}

Yabashi, M. ^{[2
,3
]}

Tamasaku, K. ^{[2
]}

Nishino, Y. ^{[2
]}

Ishikawa, T. ^{[2
,3
]}

Kuga, K. ^{[1
]}

Horie, N. ^{[1
]}

Nakatsuji, S. ^{[1
]}

Shin, S. ^{[1
,2
]}

机构：

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

[2] RIKEN SPring 8 Ctr, Sayo, Hyogo 6795148, Japan

[3] Japan Synchrotron Radiat Res Inst, Sayo, Hyogo 6795198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 24期

关键词：

PHOTOELECTRON-SPECTROSCOPY; KONDO-LATTICE; METALS; TRANSITION; ELECTRON; BEHAVIOR; YBRH2SI2;

D O I：

10.1103/PhysRevLett.104.247201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Electronic structures of the quantum critical superconductor beta-YbAlB4 and its polymorph alpha-YbAlB4 are investigated by using bulk-sensitive hard x-ray photoemission spectroscopy. From the Yb 3d core level spectra, the values of the Yb valence are estimated to be similar to 2.73 and similar to 2.75 for alpha- and beta-YbAlB4, respectively, thus providing clear evidence for valence fluctuations. The valence band spectra of these compounds also show Yb2+ peaks at the Fermi level. These observations establish an unambiguous case of a strong mixed valence at quantum criticality for the first time among heavy fermion systems, calling for a novel scheme for a quantum critical model beyond the conventional Doniach picture in beta-YbAlB4.

引用

页数：4

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