Acta Physica Polonica B

Vol. 34, No. 22, February 2003, page 1501

Search for the Quantum Spin Liquid State in Pyrochlore Oxides

H. Fukazawa, D. Yanagishima, R. Higashinaka, Y. Maeno

We have investigated a pyrochlore Mott insulator Y2Ir2O7 with an expectation that 5d5 electrons of Ir ions in the t2g orbitals give rise to an S = 1/2 Heisenberg system and form a quantum spin-liquid state. However, it exhibits spin--glass ordering below about 170 K. Such spin-glass ordering is also observed in its isomorphs Y2Mo2O7 and Y2Ru2O7 with S = 1.

PACS numbers: 71.30.+h, 75.40.Cx, 75.10.Jm

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