High-Pressure Sequence of Ba3NiSb2O9 Structural Phases: New S = 1 Quantum Spin Liquids Based on Ni2+
High-Pressure Sequence of Ba3NiSb2O9 Structural Phases: New S = 1 Quantum Spin Liquids Based on Ni2+
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DOI：
10.1103/physrevlett.107.197204
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发表时间：
2011-11-04
影响因子：
8.6
通讯作者：
Zhou, H. D.
中科院分区：
文献类型：
--
作者：
Cheng, J. G.;Li, G.;Zhou, H. D.
在高压下得到了两种新的S = 1（Ni ~（2+））矩的无带隙量子自旋液体候选物：具有Ni ~（2+）三角晶格的Ba_3NiSb_（2 O_9）的6 H-B相和具有Ni ~（2/3）Sb_（1/3）三维共边四面体晶格的3C相.尽管居里-外斯温度θ（CW）分别为-75.5（6 H-B）和-182.5 K（3 C），但这两种化合物在低至0.35 K时均未显示出磁序。低于类似于25 K时，6 H-B相的磁化率饱和到恒定值chi（0）= 0.013 emu/mol，低于7 K时，线性温度依赖的磁比热（C-M）显示巨系数γ = 168 mJ/mol K-2。这两个观测结果都表明费米液体类基态的发展。对于3C相，C-M与T-2成比例的行为指示唯一的S = 1，3D量子自旋液体基态。
Two new gapless quantum spin-liquid candidates with S = 1 (Ni2+) moments: the 6H-B phase of Ba3NiSb2O9 with a Ni2+-triangular lattice and the 3C phase with a Ni2/3Sb1/3-three-dimensional edge-shared tetrahedral lattice were obtained under high pressure. Both compounds show no magnetic order down to 0.35 K despite Curie-Weiss temperatures theta(CW) of -75.5 (6H-B) and -182.5 K(3C), respectively. Below similar to 25 K, the magnetic susceptibility of the 6H-B phase saturates to a constant value chi(0) = 0.013 emu/mol, which is followed below 7 K by a linear-temperature-dependent magnetic specific heat (C-M) displaying a giant coefficient gamma = 168 mJ/mol K-2. Both observations suggest the development of a Fermi-liquid-like ground state. For the 3C phase, the C-M proportional to T-2 behavior indicates a unique S = 1, 3D quantum spin-liquid ground state.