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Neutron Scattering Study of a Quasi-2D Spin-1/2 Dimer System Piperazinium Hexachlorodicuprate Under Hydrostatic Pressure

Published

Author(s)

Tao Hong, Chris Stock, I. Cabrera, Collin L. Broholm, Yiming Qiu, Juscelino Leao, Sarah Poulton, John R. Copley

Abstract

We report inelastic neutron scattering study of a quasi-two-dimensional S=1/2 dimer system Piperazinium Hexachlorodicuprate under hydrostatic pressure. The spin gap δ becomes softened with the increase of the hydrostatic pressure while the bandwidth of the dispersion relation is almost unaffected. The observed threefold degenerate triplet excitation under hydrostatic pressure is consistent with the theoretical prediction. At P=9.0 kbar the spin gap is reduced to δ=0.55 meV from δ=1.0 meV at ambient pressure. The results allow us to predict a soft-mode quantum phase transition in this system at Papproximately equal}20 kbar.
Citation
Physical Review B
Volume
12

Keywords

dimer, pressure, neutron scattering, spin excitation

Citation

Hong, T. , Stock, C. , Cabrera, I. , Broholm, C. , Qiu, Y. , Leao, J. , Poulton, S. and Copley, J. (2010), Neutron Scattering Study of a Quasi-2D Spin-1/2 Dimer System Piperazinium Hexachlorodicuprate Under Hydrostatic Pressure, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906383 (Accessed April 23, 2024)
Created November 21, 2010, Updated October 12, 2021