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Dominance of excitation continuum in the longitudinal spectrum of weakly coupled Heisenberg S=1/2 chains | | A. Zheludev
; K. Kakurai
; T. Masuda
; K. Uchinokura
; K. Nakajima
; | | Date: |
25 Oct 2002 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | A low-field spin flop transition in the quasi one-dimensional antiferromagnet a is exploited to study the polarization dependence of low-energy magnetic excitations. The measured longitudinal spectrum is best described as single broad continuum, with no sharp ``longitudinal mode’’, in apparent contradiction with the commonly used chain-MF/RPA theories. The observed behavior is also quite different than that previously seen in the related kcuf material, presumably due to a large difference in the relative strength of inter-chain interactions. The results highlight the limitations of the chain-MF/RPA approach. | | Source: | arXiv, cond-mat/0210568 | | Services: | Forum | Review | PDF | Favorites | |
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