准2D自旋1/2二聚体六氯二尿酸哌嗪在hydrostatic pressure作用下的中子散射研究
Neutron scattering study of a quasi-2D spin-1/2 dimer system Piperazinium Hexachlorodicuprate under hydrostatic pressure
摘要：
本文报道了准二维S=1/2二聚体体系六氯二尿酸三嗪在静水压力下的中子非弹性散射研究。自旋能隙Δ随着流体静压的增加而软化，直到P= 9.0kbar。在P= 6.0 kbar时观察到的三重简并三重激发与理论预测一致，色散关系的带宽在实验不确定性范围内不受影响。在P= 9.0 kbar时，自旋能隙从环境压力下的1.0 meV减小到0.55 meV。
英文摘要：
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 up to P= 9.0 kbar. The observed threefold degenerate triplet excitation at P= 6.0 kbar is consistent with the theoretical prediction and the bandwidth of the dispersion relation is unaffected within the experimental uncertainty. At P= 9.0 kbar the spin gap is reduced to 0.55 meV from 1.0 meV at ambient pressure.
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