Journal
PHYSICAL REVIEW B
Volume 78, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.224409
Keywords
high-pressure solid-state phase transformations; magnetic fluids; magnetic susceptibility; magnetic transitions; neutron diffraction
Funding
- Division of Scientific User Facilities
- Office of Basic Energy Sciences
- U. S. Department of Energy [DE-AC05-00OR22725]
- National Science Foundation [DMR-9986442, DMR-0086210, DMR-0454672]
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Inelastic-neutron-scattering and bulk magnetic-susceptibility studies of the quantum S=1/2 spin ladder system (CH3)(2)CHNH3CuCl3 are performed under hydrostatic pressure. The pressure dependence of the spin gap Delta is determined. At P=1500 MPa it is reduced to Delta=0.79 meV from Delta=1.17 meV at ambient pressure. The results allow us to predict a soft-mode quantum phase transition in this system at P-c similar to 4 GPa. The measurements are complicated by the proximity of a structural phase transition that leads to a deterioration of the sample.
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