Magnetic dilution in the geometrically frustrated SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$ and the role of local dynamics: a $μ$SR study

Details Magnetic dilution in the geometrically frustrated SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$ and the role of local dynamics: a $μ$SR study Magnetic dilution in the geometrically frustrated SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$ and the role of local dynamics: a $μ$SR study

2000-03-30

arxiv.org/abs/cond-mat/0003489v1

PRL 84, 3450 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.84.3450

We investigate the spin dynamics of SrCr$_{9p}$Ga$_{12-9p}$O$_{19}$ for p below and above the percolation threshold p_c using muon spin relaxation. Our major findings are: (I) At T->0 the relaxation rate is T independent and proportional to p^3, (II) the slowing down of spin fluctuation is activated with an energy U which is also a linear function of p^3 and lim_{p-> 0}U = 8 K; this energy scale could stem only from a single ion anisotropy, and (III) the p dependence of the dynamical properties is identical below and above p_c, indicating that they are controlled by local excitation.

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