The effect of externally applied pressure on the magnetic behavior of Cu2Te2O5(BrxCl{1-x})2

Details The effect of externally applied pressure on the magnetic behavior of Cu2Te2O5(BrxCl{1-x})2 The effect of externally applied pressure on the magnetic behavior of Cu2Te2O5(BrxCl{1-x})2

2006-01-02

arxiv.org/abs/cond-mat/0601023v1

Physics

Condensed Matter

Materials Science

7 pages, 9 figures

Scientific paper

10.1103/PhysRevB.73.144410

The effect of externally applied pressure on the magnetic behavior of Cu2Te2O5(BrxCl{1-x})2 with x = 0, 0.73 and 1, is investigated by a combination of magnetic susceptibility, neutron diffraction and neutron inelastic scattering measurements. The magnetic transition temperatures of the x = 0 and 0.73 compositions are observed to increase linearly with increasing pressure at a rate of 0.23(2) K/kbar and 0.04(1) K/kbar respectively. However, the bromide shows contrasting behavior with a large suppression of the transition temperature under pressure, at a rate of -0.95(9) K/kbar. In neutron inelastic scattering measurements of Cu2Te2O5Br2 under pressure only a small change to the ambient pressure magnetic excitations were observed. A peak in the density of states was seen to shift from ~5 meV in ambient pressure to ~6 meV under an applied pressure of 11.3 kbar, which was associated with an increase in the overall magnetic coupling strength.

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