Absence of magnetic order in Yb3Ga5O12: relation between phase transition and entropy in geometrically frustrated materials

Details Absence of magnetic order in Yb3Ga5O12: relation between phase transition and entropy in geometrically frustrated materials Absence of magnetic order in Yb3Ga5O12: relation between phase transition and entropy in geometrically frustrated materials

2003-09-08

arxiv.org/abs/cond-mat/0309185v1

Phys. Rev. Lett. 91, 167201 (2003)

Physics

Condensed Matter

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.91.167201

From muon spin relaxation spectroscopy experiments, we show that the sharp peak (lambda type anomaly) detected by specific heat measurements at 54 mK for the ytterbium gallium garnet compound, Yb3Ga5O12, does not correspond to the onset of a magnetic phase transition, but to a pronounced building up of dynamical magnetic pair-correlations. Beside the lambda anomaly, a broad hump is observed at higher temperature in the specific heat of this garnet and other geometrically frustrated compounds. Comparing with other frustrated magnetic systems we infer that a ground state with long-range order is reached only when at least 1/4-1/3 of the magnetic entropy is released at the lambda transition.

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