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      Quantum melting of spin ice: emergent cooperative quadrupole and chirality.

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      Journal: Physical review letters

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          Abstract

          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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          PubMed ID:: 20867877
          DOI:: 10.1103/PhysRevLett.105.047201

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