Phonon effects in the two-magnon Raman scattering in spin-Peierls systems

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Recently discovered spin-Peierls (SP) transition in the compound CuGeO{sub 3} revived the interest in theoretical studies of low dimensional spin systems and lattice spin coupling effects. Special attention has been paid to the frustration effects and their consequence on the dynamical properties. In fact, it was pointed out earlier by some of the preset authors that there are frustrated SP fluctuations in the MX materials near the crossover region. In the study of the excitations in the CuGeO{sub 3} compound, several groups have conducted two-magnon Raman scattering experiments. In addition, several theoretical studies were carried out which, however, neglected the ... continued below

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4 p.

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Zang, J.; Roeder, H.; Gammel, J.T.; Saxena, A. & Bishop, A.R. October 1, 1996.

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Description

Recently discovered spin-Peierls (SP) transition in the compound CuGeO{sub 3} revived the interest in theoretical studies of low dimensional spin systems and lattice spin coupling effects. Special attention has been paid to the frustration effects and their consequence on the dynamical properties. In fact, it was pointed out earlier by some of the preset authors that there are frustrated SP fluctuations in the MX materials near the crossover region. In the study of the excitations in the CuGeO{sub 3} compound, several groups have conducted two-magnon Raman scattering experiments. In addition, several theoretical studies were carried out which, however, neglected the phonon effects totally. In the present study, the authors show that the phonon effects are important in the two-magnon Raman scattering. The phonon effects enter the Raman scattering process in two ways. First, there is a strong spin phonon coupling; naturally, the photon-magnon coupling has a phonon term, which has strength {partial_derivative}J/{partial_derivative}u, where u is lattice distortion. Second, without frustrated spin-spin coupling J{sub 2}, there is no two-magnon Raman scattering in the high temperature uniform phase, as the scattering term commutes with the Hamiltonian. However, since the lattice fluctuations (quantum or thermal) will introduce disorder in the spin-spin coupling, there is phonon induced two-magnon Raman scattering even without J{sub 2}.

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4 p.

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OSTI as DE97000123

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  • International conference on science and technology of synthetic metals, Snowbird, UT (United States), 28 Jul - 2 Aug 1996

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  • Other: DE97000123
  • Report No.: LA-UR--96-3326
  • Report No.: CONF-960784--11
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 383648
  • Archival Resource Key: ark:/67531/metadc676436

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  • October 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 26, 2016, 3:14 p.m.

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Zang, J.; Roeder, H.; Gammel, J.T.; Saxena, A. & Bishop, A.R. Phonon effects in the two-magnon Raman scattering in spin-Peierls systems, article, October 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc676436/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.