Unconventional magnetism in the 4d~4-based 5 = 1 honeycomb system Ag_3LiRu_2O_6

Kumar R.; Dey Tusharkanti; Ette P. M.; Ramesha K.; Chakraborty Atasi; Dasgupta I; Orain J. C.; Baines C.; Toth Sandor; Shahee A.; Kundu I. S.; Prinz-Zwick M.; Gippius A. A.; Buettgen N.; Gegenwart P.; Mahajan A. V

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Unconventional magnetism in the 4d~4-based 5 = 1 honeycomb system Ag_3LiRu_2O_6

机译：基于4d〜4的5 = 1蜂窝系统Ag_3LiRu_2O_6中的非常规磁性

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We have investigated the thermodynamic and local magnetic properties of the Mott insulating system Ag3LiRu2O6 containing Ru4+ (4d(4)) for novel magnetism. The material crystallizes in a monoclinic C2/m structure with RuO6 octahedra forming an edge-shared two-dimensional honeycomb lattice with limited stacking order along the c direction. The large negative Curie-Weiss temperature (theta(CW) = -57 K) suggests antiferromagnetic interactions among Ru4+ ions, though magnetic susceptibility and heat capacity show no indication of magnetic long-range order down to 1.8 and 0.4 K, respectively. Li-7 nuclear magnetic resonance (NMR) shift follows the bulk susceptibility between 120 and 300 K and levels off below 120 K. Together with a power-law behavior in the temperature-dependent spin-lattice relaxation rate between 0.2 and 2 K, it suggest dynamic spin correlations with gapless excitations. Electronic structure calculations suggest an S = 1 description of the Ru moments and the possible importance of further neighbor interactions as well as biquadratic and ring-exchange terms in determining the magnetic properties. Analysis of our muon spin rotation data indicates spin freezing below 5 K, but the spins remain on the borderline between static and dynamic magnetism even at 20 mK.

机译：我们已经研究了含有Ru4 +（4d（4））的Mott绝缘系统Ag3LiRu2O6的热力学和局部磁性能，用于新型磁性。该材料以RuO6八面体的单斜C2 / m结构结晶，形成沿c方向的有限堆积顺序的边共享的二维蜂窝状晶格。较大的居里-魏斯负温度（theta（CW）= -57 K）表明Ru4 +离子之间存在反铁磁相互作用，尽管磁化率和热容量均未显示分别低至1.8 K和0.4 K的磁长程顺序。 Li-7核磁共振（NMR）位移遵循在120和300 K之间的整体磁化率，并在低于120 K时趋于平稳。再加上在0.2和2 K之间的温度相关自旋晶格弛豫率中的幂律行为，提出了具有无间隙激励的动态自旋相关性。电子结构计算表明，Ru矩具有S = 1的描述，并且在确定磁性能时，进一步邻域相互作用以及双二次和环交换项可能具有重要意义。对我们的μ子自旋旋转数据的分析表明，自旋冻结在5 K以下，但是即使在20 mK时，自旋仍保持在静磁和动态磁之间的边界上。

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《Physical review. B, Condensed Matter And Materals Physics》 |2019年第5期|054417.1-054417.9|共9页
作者
Kumar R.; Dey Tusharkanti; Ette P. M.; Ramesha K.; Chakraborty Atasi; Dasgupta I; Orain J. C.; Baines C.; Toth Sandor; Shahee A.; Kundu I. S.; Prinz-Zwick M.; Gippius A. A.; Buettgen N.; Gegenwart P.; Mahajan A. V;
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Indian Inst Technol, Dept Phys, Mumbai 400076, India;

Univ Augsburg, Ctr Elect Correlat & Magnetism, Expt Phys 6, D-86159 Augsburg, Germany;

CSIR, Cent Electrochem Res Inst, Madras Unit, Madras Complex, Chennai 600113, India;

CSIR, Cent Electrochem Res Inst, Madras Unit, Madras Complex, Chennai 600113, India;

Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India;

Indian Assoc Cultivat Sci, Dept Solid State Phys, Kolkata 700032, India;

PSI, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland;

PSI, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland;

PSI, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland;

Indian Inst Technol, Dept Phys, Mumbai 400076, India;

Indian Inst Technol, Dept Phys, Mumbai 400076, India;

Univ Augsburg, Ctr Elect Correlat & Magnetism, Expt Phys 5, D-86159 Augsburg, Germany;

Moscow MV Lomonosov State Univ, Dept Phys, Moscow 199991, Russia|Russian Acad Sci, PN Lebedev Phys Inst, Moscow 199991, Russia;

Univ Augsburg, Ctr Elect Correlat & Magnetism, Expt Phys 5, D-86159 Augsburg, Germany;

Univ Augsburg, Ctr Elect Correlat & Magnetism, Expt Phys 6, D-86159 Augsburg, Germany;

Indian Inst Technol, Dept Phys, Mumbai 400076, India;

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1. Unconventional magnetism in the 4d~4-based 5 = 1 honeycomb system Ag_3LiRu_2O_6 [J] . Kumar R., Dey Tusharkanti, Ette P. M., Physical review. B, Condensed Matter And Materals Physics . 2019,第5期

机译：基于4d〜4的非传统磁力5 = 1蜂窝系统AG_3LIRU_2O_6
2. Unconventional magnetism in the 4d(4)-based S=1 honeycomb system Ag3LiRu2O6 [J] . Physical review, B . 2019,第5期

机译：4D（4）的非传统磁力 - 基于S = 1蜂窝系统AG3LIRU2O6
3. Anisotropic Ru~(3+) 4d~5 magnetism in the α-RuCl_3 honeycomb system: Susceptibility, specific heat, and zero-field NMR [J] . M. Majumder, M. Schmidt, H. Rosner, Physical review . 2015,第18期

机译：α-RuCl_3蜂窝系统中的各向异性Ru〜（3+）4d〜5磁性：磁化率，比热和零场NMR
4. Crystal structure and magnetism of PrFe(CN)_6·4D_2O [C] . V. Kavecansky, M. Mihalik, S. Matas, European Powder Diffraction Conference vol.2 . 2006

机译：Pr Fe（CN）_6·4D_2O的晶体结构和磁性
5. Quantum liquid crystal phases and unconventional magnetism in electronic and atomic Fermi systems. [D] . Munoz Fregoso, Benjamin. 2010

机译：电子和原子费米系统中的量子液晶相和非常规磁性。
6. Edge magnetism of Heisenberg model on honeycomb lattice [O] . Wen-Min Huang, Toshiya Hikihara, Yen-Chen Lee, -1

机译：蜂窝格上海森堡模型的边缘磁
7. Anisotropic Ru³⁺ 4d⁵ magnetism in the α-RuCl₃ honeycomb system: Susceptibility, specific heat, and zero-field NMR [O] . Majumder, M., Schmidt, M., Rosner, H., 2015

机译：α-RuCl _{3 蜂窝体系中的各向异性Ru ^{3 + 4d ^{5 磁性：易感性，比热和零场NmR}}}

Unconventional magnetism in the 4d~4-based 5 = 1 honeycomb system Ag_3LiRu_2O_6

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