Spin-orbit phase behavior of Na2Co2TeO6 at low temperatures

被引：64

作者：

Chen, Wenjie ^{[1
]}

Li, Xintong ^{[1
]}

Hu, Zhenhai ^{[1
]}

Hu, Ze ^{[2
,3
]}

Yue, Li ^{[1
]}

Sutarto, Ronny ^{[4
]}

He, Feizhou ^{[4
]}

Iida, Kazuki ^{[5
]}

Kamazawa, Kazuya ^{[5
]}

Yu, Weiqiang ^{[2
,3
]}

Lin, Xi ^{[1
,6
,7
]}

Li, Yuan ^{[1
]}

机构：

[1] Peking Univ, Int Ctr Quantum Mat, Sch Phys, Beijing 100871, Peoples R China

[2] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China

[3] Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China

[4] Canadian Light Source, Saskatoon, SK S7N 2V3, Canada

[5] Comprehens Res Org Sci & Soc CROSS, Neutron Sci & Technol Ctr, Tokai, Ibaraki 3191106, Japan

[6] Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China

[7] Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China

来源：

PHYSICAL REVIEW B | 2021年 / 103卷 / 18期

基金：

加拿大自然科学与工程研究理事会; 加拿大健康研究院; 加拿大创新基金会;

关键词：

MAGNETIC-PROPERTIES;

D O I：

10.1103/PhysRevB.103.L180404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present a comprehensive study of single crystals of Na2Co2TeO6, a putative Kitaev honeycomb magnet, focusing on its low-temperature phase behaviors. A new thermal phase transition is identified at 31.0 K, below which the system develops a two-dimensional (2D) long-range magnetic order. This order precedes the well-known three-dimensional (3D) order below 26.7 K, and is likely driven by strongly anisotropic interactions. Surprisingly, excitations from the 3D order do not support the order's commonly accepted "zigzag" nature, and are instead consistent with a "triple-q" description, which has remained hitherto unexplored in the study of Kitaev honeycomb magnets. The 3D order exerts a fundamental feedback on high-energy excitations that likely involve orbital degrees of freedom, and it features strongly scattered spin waves until at much lower temperatures, a sign for ground state near degeneracy and frustration. These findings constrain microscopic models and render Na2Co2TeO6 a spin-orbit entangled frustrated magnet that hosts very rich physics.

引用

页数：6

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