Absence of nesting in the charge-density-wave system 1T-VS2 as seen by photoelectron spectroscopy

被引：103

作者：

Mulazzi, M. ^{[1
]}

Chainani, A. ^{[1
,2
]}

Katayama, N. ^{[3
]}

Eguchi, R. ^{[1
,4
]}

Matsunami, M. ^{[1
,4
]}

Ohashi, H. ^{[5
]}

Senba, Y.

Nohara, M. ^{[3
]}

Uchida, M. ^{[6
]}

Takagi, H. ^{[3
,6
,7
]}

Shin, S. ^{[1
,4
]}

机构：

[1] RIKEN, Excitat Order Res Team, Mikazuki, Hyogo 6795148, Japan

[2] RIKEN, Coherent Xray Opt Lab, Mikazuki, Hyogo 6795148, Japan

[3] Univ Tokyo, Dept Adv Mat, Kashiwa, Chiba 2778561, Japan

[4] Univ Tokyo, Inst Solid State Phys, Chiba 2278587, Japan

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

[6] RIKEN, Magnet Mat Lab, Wako, Saitama 3510198, Japan

[7] AIST, CERC, Tsukuba, Ibaraki 3058562, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 07期

关键词：

RESOLVED RESONANT PHOTOEMISSION; ABSORPTION-SPECTRA;

D O I：

10.1103/PhysRevB.82.075130

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report on the electronic structure and Fermi surfaces of the transition-metal dichalcogenide 1T-VS2 in the low-temperature charge-density-wave (CDW) ordered phase. Using soft x-ray angle-resolved photoemission spectroscopy (ARPES), we investigate the in-plane and out-of-plane vanadium-and sulfur-derived band dispersions and identify k(z) dispersions in this layered system. Core-level photoemission and x-ray absorption spectroscopy show that vanadium electrons are in the d(1) configuration while 2p-3d resonant ARPES shows only 3d-derived dispersive bands near the Fermi level. Comparison of energy-and angle-dependent data with band-structure calculations reveals renormalization of the 3d bands, but no lower Hubbard band, a signature of the rather weak electron-electron correlations in VS2. High-resolution temperature-dependent low-energy ARPES measurements show the opening of an energy gap at the Fermi level that is attributed to the condensation of the CDW phase. The results indicate a CDW transition in the absence of nesting for 1T-VS2

引用

页数：6

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