Quantum Melting of Spin Ice: Emergent Cooperative Quadrupole and Chirality

Details Quantum Melting of Spin Ice: Emergent Cooperative Quadrupole and Chirality Quantum Melting of Spin Ice: Emergent Cooperative Quadrupole and Chirality

2009-07-15

arxiv.org/abs/0907.2536v3

Physical Review Letters105, 047201 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages including 4 fgures; accepted for publication in Phys. Rev. Lett.; powder-neutron scatteing profile added in favorable

Scientific paper

10.1103/PhysRevLett.105.047201

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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