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16 April 2024 |
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Frustration-Induced Two Dimensional Quantum Disordered Phase in Piperazinium Hexachlorodicuprate | | M. B. Stone
; I. Zaliznyak
; Daniel H.Reich
; C. Broholm
; | | Date: |
9 Apr 2001 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | 1,3), Daniel H.Reich , and C. Broholm (1,2) (Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD, National Institute of Standards and Technology, Gaithersburg, MD, Department of Physics, Brookhaven National Laboratory, Upt | | Abstract: | Piperazinium Hexachlorodicuprate (PHCC) is shown to be a frustrated quasi-two-dimensional quantum Heisenberg antiferromagnet with a gapped spectrum. Zero-field inelastic neutron scattering and susceptibility and specific heat measurements as a function of applied magnetic field are presented. At T = 1.5 K, the magnetic excitation spectrum is dominated by a single propagating mode with a gap, Delta = 1 meV, and bandwidth of approximately 1.8 meV in the (h0l) plane. The mode has no dispersion along the b* direction indicating that neighboring a-c planes of the triclinic structure are magnetically decoupled. The heat capacity shows a reduction of the gap as a function of applied magnetic field in agreement with a singlet-triplet excitation spectrum. A field-induced ordered phase is observed in heat capacity and magnetic susceptibility measurements for magnetic fields greater than H_c1 approximately equal to 7.5 Tesla. Analysis of the neutron scattering data reveals the important exchange interactions and indicates that some of these are highly frustrated. | | Source: | arXiv, cond-mat/0104150 | | Services: | Forum | Review | PDF | Favorites | |
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