Observation of Charge Density Wave in Layered Hexagonal Cu1.89Te Single Crystal

被引：3

作者：

Gao, Wenshuai ^{[1
,2
]}

Chen, Zheng ^{[3
,5
]}

Wei, Wensen ^{[3
]}

Yan, Chao ^{[4
]}

Wang, Shasha ^{[3
,5
]}

Tang, Jin ^{[3
]}

Zhang, Ranran ^{[3
]}

Cheng, Lixun ^{[1
,2
]}

Nan, Pengfei ^{[1
,2
]}

Wang, Jie ^{[3
,5
]}

Han, Yuyan ^{[3
]}

Xi, Chuanying ^{[3
]}

Ge, Binghui ^{[1
,2
]}

He, Lin ^{[4
]}

Du, Haifeng ^{[1
,2
,3
]}

Ning, Wei ^{[3
]}

Zhu, Xiangde ^{[3
]}

Tian, Mingliang ^{[3
,6
]}

机构：

[1] Anhui Univ, Inst Phys Sci, Hefei 230601, Peoples R China

[2] Anhui Univ, Inst Informat Technol, Hefei 230601, Peoples R China

[3] Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme C, High Magnet Field Lab, Hefei 230031, Peoples R China

[4] Beijing Normal Univ, Ctr Adv Quantum Studies, Dept Phys, Beijing 100875, Peoples R China

[5] Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China

[6] Anhui Univ, Sch Phys & Optoelect Engn, Hefei 230601, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2023年 / 40卷 / 01期

基金：

中国国家自然科学基金;

关键词：

ELECTRONIC-STRUCTURE; ULTRAHIGH MOBILITY; PHASE; MAGNETORESISTANCE; CU2-XTE;

D O I：

10.1088/0256-307X/40/1/017101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report comprehensive transport, electron microscopy and Raman spectroscopy studies on transition-metal chalcogenides Cu1.89Te single crystals. The metallic Cu1.89Te displays successive metal-semiconductor transitions at low temperatures and almost ideal linear MR when magnetic field up to 33 T. Through the electron diffraction patterns, the stable room-temperature phase is identified as a 3 x 3 x 2 modulated superstructure based on the Nowotny hexagonal structure. The superlattice spots of transmission electron microscopy and scanning tunneling microscopy clearly show the structural transitions from the room-temperature commensurate I phase, named as C-I phase, to the low temperature commensurate II (C-II) phase. All the results can be understood in terms of charge density wave (CDW) instability, yielding intuitive evidences for the CDW formations in Cu1.89Te. The additional Raman modes below room temperature further reveal that the zone-folded phonon modes may play an important role on the CDW transitions. Our research sheds light on the novel electron features of Cu1.89Te at low temperature, and may provide potential applications for future nano-devices.

引用

页数：6

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