Effect of pressure on the quantum spin ladder material IPA-CuCl3
Abstract
Inelastic neutron scattering and bulk magnetic susceptibility studies of the quantum S=1/2 spin ladder system IPA-CuCl3 are performed under hydrostatic pressure. The pressure dependence of the spin gap is determined. At P=1.5 GPa it is reduced to =0.79 meV from =1.17 meV at ambient pressure. The results allow us to predict a soft-mode quantum phase transition in this system at Pc 4 GPa. The measurements are complicated by a proximity of a structural phase transition that leads to a deterioration of the sample.
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