High-field NMR study on the topologically nontrivial 1/3 magnetization plateau state in doped Na2Cu3Ge4-xSixO12

被引：1

作者：

Han, Yuyan ^{[1
]}

Yu, Bocheng ^{[2
]}

Du, Zan ^{[1
]}

Ling, Langsheng ^{[1
]}

Zhang, Lei ^{[1
]}

Tong, Wei ^{[1
]}

Xi, Chuanying ^{[1
]}

Zhang, Jinglei ^{[1
]}

Shang, Tian ^{[2
,3
]}

Pi, Li ^{[1
,4
]}

Ma, Long ^{[1
]}

机构：

[1] Chinese Acad Sci, Anhui Key Lab Low Energy Quantum Mat & Devices, High Magnet Field Lab, Hefei 230031, Peoples R China

[2] East China Normal Univ, Sch Phys & Elect Sci, Key Lab Polar Mat & Devices, MOE, Shanghai 200241, Peoples R China

[3] Chongqing Inst East China Normal Univ, Chongqing Key Lab Precis Opt, Chongqing 401120, Peoples R China

[4] Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Hefei 230026, Peoples R China

来源：

PHYSICAL REVIEW B | 2024年 / 110卷 / 20期

基金：

中国国家自然科学基金; 上海市自然科学基金;

关键词：

NUCLEAR-SPIN RELAXATION; HALDANE-GAP SYSTEM; CHAINS; DYNAMICS;

D O I：

10.1103/PhysRevB.110.L201102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin-1/2 trimer system Na2Cu3Ge4O12 is proposed to host topologically nontrivial 1/3 magnetization (M) plateau state. In this paper, we report a high-field nuclear magnetic resonance (NMR) study on the low-energy spin excitations of the 1/3-M plateau state in Na2Cu3Ge4O12 and Si-doped samples. First, the spin excitation gap supporting the high-field Haldane phase is indicated by the thermally activated behavior of spin-lattice relaxation rates in the 1/3-M plateau state. Second, by substituting Ge4+ with Si4+, the critical field for the 1/3-M plateau significantly decreases, e.g., mu 0 H c = 17 T in the x = 1.0 sample, which results from the suppressed intertrimer coupling J 2 . The gapped spin excitation is observed above 17 T whose size shows the temperature-dependent behavior for mu 0 H 25.72 T. These observations support the topological nontrivial characteristic of the 1/3-M plateau state.

引用

页数：6

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