Superconductivity and bandwidth-controlled Mott metal-insulator transition in 1T-TaS2-xSex

被引：70

作者：

Ang, R. ^{[1
]}

Miyata, Y. ^{[2
]}

Ieki, E. ^{[2
]}

Nakayama, K. ^{[2
]}

Sato, T. ^{[2
]}

Liu, Y. ^{[3
]}

Lu, W. J. ^{[3
]}

Sun, Y. P. ^{[3
,4
]}

Takahashi, T. ^{[1
,2
]}

机构：

[1] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Sendai, Miyagi 9808577, Japan

[2] Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan

[3] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China

[4] Chinese Acad Sci, High Magnet Field Lab, Hefei 230031, Peoples R China

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 11期

基金：

日本科学技术振兴机构; 中国国家自然科学基金; 日本学术振兴会;

关键词：

CHARGE-DENSITY WAVES; SCANNING-TUNNELING-MICROSCOPY; BAND STRUCTURES; DOPED; 1T-TAS2; FERMI-SURFACE; PHASES; ELECTRONS; PURE; TAS2; 1T;

D O I：

10.1103/PhysRevB.88.115145

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) of layered chalcogenide 1T-TaS2-xSex to elucidate the electronic states especially relevant to the occurrence of superconductivity. We found a direct evidence for a Ta-5d-derived electron pocket associated with the superconductivity, which is fragile against a Mott-gap opening observed in the insulating ground state for S-rich samples. In particular, a strong electron-electron interaction-induced Mott gap driven by a Ta 5d orbital also exists in the metallic ground state for Se-rich samples, while finite ARPES intensity near the Fermi level likely originating from a Se 4p orbital survives, indicative of the orbital-selective nature of the Mott transition. Present results suggest that effective electron correlation and p-d hybridization play a crucial role to tune the superconductivity and Mott metal-insulator transition.

引用

页数：5

共 39 条

[1] Real-Space Coexistence of the Melted Mott State and Superconductivity in Fe-Substituted 1T-TaS2 [J].

Ang, R. ;

Tanaka, Y. ;

Ieki, E. ;

Nakayama, K. ;

Sato, T. ;

Li, L. J. ;

Lu, W. J. ;

Sun, Y. P. ;

Takahashi, T. .

PHYSICAL REVIEW LETTERS, 2012, 109 (17)

[2] Orbital-selective Mott-insulator transition in Ca2-xSrxRuO4 [J].

Anisimov, VI ;

Nekrasov, IA ;

Kondakov, DE ;

Rice, TM ;

Sigrist, M .

EUROPEAN PHYSICAL JOURNAL B, 2002, 25 (02) :191-201

[3] Interplane coupling in the quasi-two-dimensional 1T-TaS2 -: art. no. 125105 [J].

Bovet, M ;

van Smaalen, S ;

Berger, H ;

Gaal, R ;

Forró, L ;

Schlapbach, L ;

Aebi, P .

PHYSICAL REVIEW B, 2003, 67 (12) :5

[4] Pseudogapped Fermi surfaces of 1T-TaS2 and 1T-TaSe2:: A charge density wave effect -: art. no. 125117 [J].

Bovet, M ;

Popovic, D ;

Clerc, F ;

Koitzsch, C ;

Probst, U ;

Bucher, E ;

Berger, H ;

Naumovic, D ;

Aebi, P .

PHYSICAL REVIEW B, 2004, 69 (12)

[5] Charge ordering in the TMTTF family of molecular conductors [J].

Chow, DS ;

Zamborszky, E ;

Alavi, B ;

Tantillo, DJ ;

Baur, A ;

Merlic, CA ;

Brown, SE .

PHYSICAL REVIEW LETTERS, 2000, 85 (08) :1698-1701

[6] Spin-orbit splitting in the valence bands of 1T-TaS2 and 1T-TaSe2 [J].

Clerc, F ;

Bovet, M ;

Berger, H ;

Despont, L ;

Koitzsch, C ;

Gallus, O ;

Patthey, L ;

Shi, M ;

Krempasky, J ;

Garnier, MG ;

Aebi, P .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2004, 16 (18) :3271-3278

[7] Mott phase at the surface of 1T-TaSe2 observed by scanning tunneling microscopy -: art. no. 036405 [J].

Colonna, S ;

Ronci, F ;

Cricenti, A ;

Perfetti, L ;

Berger, H ;

Grioni, M .

PHYSICAL REVIEW LETTERS, 2005, 94 (03)

[8] Scanning tunneling microscopy observation of a mott-insulator phase at the 1T-TaSe2 surface [J].

Colonna, S ;

Ronci, F ;

Cricenti, A ;

Perfetti, L ;

Berger, H ;

Grioni, M .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2006, 45 (3B) :1950-1952

[9] Calculation and XPS measurements of the Ta4f CDW splitting in Cu, Cs and Li intercalation phases of 1T-TaX2 (X = S, Se) [J].

Crawack, HJ ;

Pettenkofer, C .

SOLID STATE COMMUNICATIONS, 2001, 118 (07) :325-332

[10] CORRELATED ELECTRONS IN HIGH-TEMPERATURE SUPERCONDUCTORS [J].

DAGOTTO, E .

REVIEWS OF MODERN PHYSICS, 1994, 66 (03) :763-840

← 1 2 3 4 →