title: Quest for frustration driven distortion in Y2(Mo2)O(7).
abstract: We investigated the nature of the freezing in the geometrically frustrated Heisenberg spin glass Y2(Mo2)O(7) by measuring the temperature dependence of the static internal magnetic field distribution above the spin-glass temperature, Tg, using the muon spin relaxation technique. The evolution of the field distribution cannot be explained by changes in the spin susceptibility alone and suggests a lattice deformation. This possibility is addressed by numerical simulations of the Heisenberg Hamiltonian with magnetoelastic coupling at T > 0.
authors.affiliation: Physics Department, Technion, Israel Institute of Technology, Haifa 32000, Israel.
authors.forename: Eva
authors.initials: E
authors.lastname: Sagi
authors.forename: Oren
authors.initials: O
authors.lastname: Ofer
authors.forename: Amit
authors.initials: A
authors.lastname: Keren
authors.forename: Jason S
authors.initials: JS
authors.lastname: Gardner