Emergence of charge density wave domain walls above the superconducting dome in 1T-TiSe 2

被引：0

作者：

Joe Y.I. ^{[1
]}

Chen X.M. ^{[1
]}

Ghaemi P. ^{[1
]}

Finkelstein K.D. ^{[2
]}

De La Peña G.A. ^{[1
]}

Gan Y. ^{[1
]}

Lee J.C.T. ^{[1
]}

Yuan S. ^{[1
]}

Geck J. ^{[3
]}

MacDougall G.J. ^{[1
]}

Chiang T.C. ^{[1
]}

Cooper S.L. ^{[1
]}

Fradkin E. ^{[1
]}

Abbamonte P. ^{[1
,4
]}

机构：

[1] Department of Physics, Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana

[2] Cornell High Energy Synchrotron Source, Cornell University, Ithaca

[3] Leibniz Institute for Solid State and Materials Research, D-01171 Dresden

[4] Advanced Photon Source, Argonne National Laboratory, Argonne

来源：

Nature Physics | 2014年 / 10卷 / 6期

基金：

美国国家科学基金会; 美国国家卫生研究院;

关键词：

D O I：

10.1038/nphys2935

中图分类号：

学科分类号：

摘要：

Superconductivity in so-called unconventional superconductors is nearly always found in the vicinity of another ordered state, such as antiferromagnetism, charge density wave (CDW), or stripe order. This suggests a fundamental connection between superconductivity and fluctuations in some other order parameter. To better understand this connection, we used high-pressure X-ray scattering to directly study the CDW order in the layered dichalcogenide TiSe 2, which was previously shown to exhibit superconductivity when the CDW is suppressed by pressure or intercalation of Cu atoms. We succeeded in suppressing the CDW fully to zero temperature, establishing for the first time the existence of a quantum critical point (QCP) at P c = 5.1 ± 0.2 GPa, which is more than 1 GPa beyond the end of the superconducting region. Unexpectedly, at P = 3 GPa we observed a reentrant, weakly first order, incommensurate phase, indicating the presence of a Lifshitz tricritical point somewhere above the superconducting dome. Our study suggests that superconductivity in TiSe 2 may not be connected to the QCP itself, but to the formation of CDW domain walls. © 2014 Macmillan Publishers Limited. All rights reserved.

引用

页码：421 / 425

页数：4

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