Ferromagnetic - spin glass transition induced by pressure in the geometrically frustrated pyrochlore (Tb$_{1-x}$La$_x$)$_2$Mo$_2$O$_7$

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dc.creatorApetrei, A.
dc.creatorMirebeau, I.
dc.creatorGoncharenko, I.
dc.creatorAndreica, D.
dc.creatorBonville, P.
dc.date2006-04-27
dc.date.accessioned2026-07-07T07:08:36Z
dc.date.available2026-07-07T07:08:36Z
dc.descriptionWe have studied (Tb$_{1-x}$La$_x$)$_2$Mo$_2$O$_7$ pyrochlores by neutron diffraction and $μ$SR at ambient and under applied pressure. Substitution of Tb for La expands the lattice and induces a change from a spin-glass like state ({\itshape x}=0) to a non collinear ferromagnet ({\itshape x}=0.2). In the ferromagnetic structure, the Tb moments orient close to their local anisotropy axis as for an ordered spin ice, while the Mo moments orient close to the net moment. The $μ$SR dynamical relaxation rate shows a cusp-like peak at the Curie temperature T$_C$ and a broad anomaly at T$^\star$$<$T$_C$, suggesting a second transition of local or dynamical nature. Under pressure, the long range order breaks down and a spin glass-like state is recovered. The whole set of data provide a microscopic picture of the spin correlations and fluctuations in the region of the ferromagnetic-spin glass threshold.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0604627
dc.identifierhttp://arxiv.org/abs/cond-mat/0604627
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/110768
dc.subjectStrongly Correlated Electrons
dc.titleFerromagnetic - spin glass transition induced by pressure in the geometrically frustrated pyrochlore (Tb$_{1-x}$La$_x$)$_2$Mo$_2$O$_7$
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