Randomness-induced quantum spin liquid behavior in the s=1/2 bond-random Heisenberg antiferromagnet on the pyrochlore lattice
Abstract
We investigate the zero- and finite-temperature properties of the bond-random s=1/2 Heisenberg antiferromagnet on the pyrochlore lattice by the exact diagonalization and the Hams--de Raedt methods. We find that the randomness induces the gapless quantum spin liquid (QSL) state, the random-singlet state. Implications to recent experiments on the mixed-anion pyrochlore-lattice antiferromagnet Lu2Mo2O5N2 exhibiting gapless QSL behaviors are discussed.
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