Quantum Melting of Spin Ice: Emergent Cooperative Quadrupole and Chirality
Quantum Melting of Spin Ice: Emergent Cooperative Quadrupole and Chirality
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DOI：
10.1103/physrevlett.105.047201
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发表时间：
2010-07-19
影响因子：
8.6
通讯作者：
Tanaka, Yoichi
中科院分区：
文献类型：
--
作者：
Onoda, Shigeki;Tanaka, Yoichi
提出了烧绿石晶格磁体Pr2TM2O7 （TM = Ir， Zr和Sn）自旋冰的量子熔化。在原子非克雷默磁偶极子的基础上，导出了具有非平凡磁各向异性的量子超交换哈密顿量。基态表现出铁四极子和伪自旋的协同手性，形成了一种类似于近晶液晶的磁性结构。我们的理论解释了实验观察到的Pr2TM2O7的动态自旋冰行为。
Quantum melting of spin ice is proposed for pyrochlore-lattice magnets Pr2TM2O7 (TM = Ir, Zr, and Sn). The quantum superexchange Hamiltonian having a nontrivial magnetic anisotropy is derived on the basis of atomic non-Kramers magnetic doublets. The ground states exhibit a cooperative ferroquadrupole and pseudospin chirality, forming a magnetic analog of smectic liquid crystals. Our theory accounts for dynamic spin-ice behaviors experimentally observed in Pr2TM2O7.