Evidence for a Correlated Insulator to Antiferromagnetic Metal Transition in CrN

被引：69

作者：

Bhobe, P. A. ^{[1
,2
]}

Chainani, A. ^{[2
]}

Taguchi, M. ^{[2
]}

Takeuchi, T. ^{[3
]}

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

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

Ishizaka, K. ^{[1
]}

Takata, Y. ^{[2
]}

Oura, M. ^{[2
]}

Senba, Y. ^{[3
]}

Ohashi, H. ^{[3
]}

Nishino, Y. ^{[2
]}

Yabashi, M. ^{[2
]}

Tamasaku, K. ^{[2
]}

Ishikawa, T. ^{[2
]}

Takenaka, K. ^{[4
,5
]}

Takagi, H. ^{[5
]}

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

机构：

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

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

[3] JASRI SPring 8, Sayo, Hyogo 6795198, Japan

[4] Nagoya Univ, Dept Crystalline Mat Sci, Nagoya, Aichi 4648603, Japan

[5] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 23期

关键词：

PHASE-TRANSITION; ENERGY; STATES; TIN; VN;

D O I：

10.1103/PhysRevLett.104.236404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the electronic structure of chromium nitride (CrN) across the first-order magneto-structural transition at T-N similar to 286 K. Resonant photoemission spectroscopy (PES) shows a gap in the 3d partial density of states at the Fermi level and an on-site Coulomb energy U similar to 4.5 eV, indicating strong electron-electron correlations. Bulk-sensitive high-resolution (6 meV) laser PES reveals a clear Fermi edge indicating an antiferromagnetic metal below T-N. Hard x-ray Cr 2p core-level PES shows T-dependent changes across T-N which originate from screening due to coherent states as substantiated by cluster model calculations using the experimentally observed U. Electrical resistivity confirms an insulator above T-N (E-g similar to 70 meV) becoming a disordered metal below T-N. Thus, CrN transforms from a correlated insulator to an antiferromagnetic metal, coupled to the magnetostructural transition.

引用

页数：4

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