Observation of a Charge Density Wave Incommensuration Near the Superconducting Dome in CuxTiSe2

被引：84

作者：

Kogar, A. ^{[1
,2
,3
]}

de la Pena, G. A. ^{[1
,2
]}

Lee, Sangjun ^{[1
,2
]}

Fang, Y. ^{[2
]}

Sun, S. X. -L. ^{[1
,2
]}

Lioi, D. B. ^{[4
]}

Karapetrov, G. ^{[4
]}

Finkelstein, K. D. ^{[5
]}

Ruff, J. P. C. ^{[5
]}

Abbamonte, P. ^{[1
,2
]}

Rosenkranz, S. ^{[3
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[2] Univ Illinois, Mat Res Lab, Urbana, IL 61801 USA

[3] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[4] Drexel Univ, Dept Phys, Philadelphia, PA 19104 USA

[5] Cornell Univ, Cornell High Energy Synchrotron Source, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 02期

基金：

美国国家科学基金会; 美国国家卫生研究院;

关键词：

2H-TASE2; 1T-TAS2; PHASE; TISE2;

D O I：

10.1103/PhysRevLett.118.027002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

X-ray diffraction was employed to study the evolution of the charge density wave (CDW) in CuxTiSe2 as a function of copper intercalation in order to clarify the relationship between the CDW and superconductivity. The results show a CDWincommensuration arising at an intercalation value coincident with the onset of superconductivity at around x = 0.055(5). Additionally, it was found that the charge density wave persists to higher intercalant concentrations than previously assumed, demonstrating that the CDW does not terminate inside the superconducting dome. A charge density wave peak was observed in samples up to x = 0.091(6), the highest copper concentration examined in this study. The phase diagram established in this work suggests that charge density wave incommensuration may play a role in the formation of the superconducting state.

引用

页数：5

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