Mechanism of ground-state selection in the frustrated molecular spin cluster V15

Mechanism of ground-state selection in the frustrated molecular spin cluster V15
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受挫分子自旋簇 V15 的基态选择机制

DOI：
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发表时间：
2004
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通讯作者：
B. Barbara
B. Barbara
中科院分区：
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文献类型：
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作者：
G. Chaboussant;S. Ochsenbein;A. Sieber;H. Güdel;H. Mutka;A. Müller;B. Barbara

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本文报道了磁场作用下自旋阻挫团簇V15的非弹性中子散射（INS）研究。几个场依赖的跃迁被观察到，并提供了一个全面的理解的低能量量子自旋态。两个最低S = 1/2 Kramers双峰之间的能隙为2Δ0 <$27（3）μeV，这明确归因于团簇的对称性降低。INS数据被映射到S = 1/2反铁磁海森堡三角形，带有不等边三角形失真。导出了基态内波函数混合的定量描述。
We report an inelastic neutron scattering (INS) study under a magnetic field on the frustrated molecular spin cluster V15. Several field-dependent transitions are observed and provide a comprehensive understanding of the low-energy quantum spin states. The energy gap 2Δ0 ≈ 27(3) μeV between the two lowest S = 1/2 Kramers doublets is unambiguously attributed to a symmetry lowering of the cluster. The INS data are mapped onto an S = 1/2 Antiferromagnetic Heisenberg triangle with scalene distortion. A quantitative description of the wave function mixing within the ground state is derived.