自旋冰的量子熔化:涌现合作四极和手征
Quantum Melting of Spin Ice: Emergent Cooperative Quadrupole and Chirality
摘要:
提出了辉石晶格磁体Pr $_2TM_2$ O $_7$($TM=$ Ir,Zr,Sn)自旋冰的量子熔化.在原子非Kramers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。基态表现出合作的铁四极和赝自旋手性,形成近晶相液晶的磁性模拟。我们的理论解释了在Pr $_2TM_2$ O $_7$中实验观察到的动态自旋冰行为。
英文摘要:
A quantum melting of the spin ice is proposed for pyrochlore-lattice magnets Pr$_2TM_2$O$_7$ ($TM=$Ir, Zr, and Sn). The quantum superexchange Hamiltonian having a nontrivial magnetic anisotropy is derived in 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 Pr$_2TM_2$O$_7$.
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