Chiral Phase Transition in Charge Ordered 1T-TiSe2

被引：59

作者：

Castellan, John-Paul ^{[1
]}

Rosenkranz, Stephan ^{[1
]}

Osborn, Ray ^{[1
]}

Li, Qing'an ^{[1
]}

Gray, K. E. ^{[1
]}

Luo, X. ^{[1
]}

Welp, U. ^{[1
]}

Karapetrov, Goran ^{[1
,2
]}

Ruff, J. P. C. ^{[3
,4
]}

van Wezel, Jasper ^{[1
,5
]}

机构：

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

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

[3] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[4] Cornell Univ, CHESS, Ithaca, NY 14853 USA

[5] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 19期

关键词：

SINGLE-CRYSTALS; TISE2; STATE;

D O I：

10.1103/PhysRevLett.110.196404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It was recently discovered that the low-temperature, charge-ordered phase of 1T-TiSe2 has a chiral character. This unexpected chirality in a system described by a scalar order parameter could be explained in a model where the emergence of relative phase shifts between three charge density wave components breaks the inversion symmetry of the lattice. Here, we present experimental evidence for the sequence of phase transitions predicted by that theory, going from disorder to nonchiral and finally to chiral charge order. Employing x-ray diffraction, specific heat, and electrical transport measurements, we find that a novel phase transition occurs similar to 7 K below the main charge ordering transition in TiSe2, in agreement with the predicted hierarchy of charge-ordered phases.

引用

页数：5

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