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.
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Onoda et al. (2010) studied this question.
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