Phys. Rev. Lett. 83, 211–214 (1999)Glassy Statics and Dynamics in the Chemically Ordered Pyrochlore Antiferromagnet Y2Mo2O7Received 4 January 1999; published in the issue dated 5 July 1999 Static and dynamic magnetic correlations in the geometrically frustrated pyrochlore antiferromagnet Y2Mo2O7 have been studied using neutron scattering. The material is chemically ordered but displays a spin-freezing transition at Tg∼22.5 K. We show that dynamic short range order develops below room temperature. Upon cooling the two-spin correlation length never exceeds 5 Å, yet the spin fluctuation rate vanishes in proportion to T-Tg. For T<Tg low energy spin fluctuations are replaced by static antiferromagnetic short range order with a frozen staggered magnetization |〈S〉|/S≈0.67(2). Locally the frozen spin structure corresponds to four sublattice ordering with zero magnetization. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.211
DOI:
10.1103/PhysRevLett.83.211
PACS:
75.50.Lk, 75.25.+z, 75.40.Cx, 75.40.Gb
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