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Raman spectra of two‐dimensional spin‐1/2 Heisenberg antiferromagnets
dc.contributor.authorHaas, Stephanen_US
dc.contributor.authorDagotto, Elbioen_US
dc.contributor.authorRiera, Joseen_US
dc.contributor.authorMerlin, Robertoen_US
dc.contributor.authorNori, Francoen_US
dc.date.accessioned2010-05-06T22:09:03Z
dc.date.available2010-05-06T22:09:03Z
dc.date.issued1994-05-15en_US
dc.identifier.citationHaas, Stephan; Dagotto, Elbio; Riera, Jose; Merlin, Roberto; Nori, Franco (1994). "Raman spectra of two‐dimensional spin‐1/2 Heisenberg antiferromagnets." Journal of Applied Physics 75(10): 6340-6342. <http://hdl.handle.net/2027.42/70431>en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/70431
dc.description.abstractThe Raman spectrum of two‐dimensional spin‐1/2 Heisenberg antiferromagnets is calculated by exactly diagonalizing clusters of up to 26 sites. The obtained spectra are compared to experimental results for various high‐Tc precursors, such as La2CuO4 and YBa2Cu3O6.2. In spite of good agreement in the position of the main excitation in the B1g channel, i.e, the two‐magnon peak around 0.4 eV, an additional mechanism has to be invoked to account for the broad and asymmetric shape of the overall spectrum. Here, we consider the phonon‐magnon interaction which, in a quasistatic approximation, renormalizes the Heisenberg exchange integral. This mechanism is motivated in part by recent experimental observations that the Raman linewidth broadens with increasing temperature. Our results are in good agreement with Raman scattering experiments performed by various groups; in particular, the calculations reproduce the broad line shape of the two‐magnon peak, the asymmetry about its maximum, the existence of spectral weight at high energies, and the observation of nominally forbidden A1g scattering.en_US
dc.format.extent3102 bytes
dc.format.extent366694 bytes
dc.format.mimetypetext/plain
dc.format.mimetypeapplication/pdf
dc.publisherThe American Institute of Physicsen_US
dc.rights© The American Institute of Physicsen_US
dc.titleRaman spectra of two‐dimensional spin‐1/2 Heisenberg antiferromagnetsen_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelPhysicsen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Physics, University of Michigan, Ann Arbor, Michigan 48109‐1120en_US
dc.contributor.affiliationotherDepartment of Physics and Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306en_US
dc.contributor.affiliationotherPhysics Division and Center for Computationally Intensive Physics, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831‐6373en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/70431/2/JAPIAU-75-10-6340-1.pdf
dc.identifier.doi10.1063/1.355393en_US
dc.identifier.sourceJournal of Applied Physicsen_US
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dc.identifier.citedreferenceR. R. P. Singh et al., Phys. Rev. B 62, 2736 (1989); S. Bacci and E. Gagliano, 42, 8773 (1990); S. Bacci and E. Gagliano, 43, 6224 (1991).en_US
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dc.identifier.citedreferenceC. M. Cannali and S. M. Girvin, Phys. Rev. B 45, 7127 (1992).en_US
dc.identifier.citedreferenceM. J. Massey et al., Phys. Rev. Lett. 69, 2299 (1992); S. Rosenblum et al., Phys. Rev. B (to be published).en_US
dc.identifier.citedreferenceJ. W. Halley, Phys. Rev. 154, 458 (1967).en_US
dc.identifier.citedreferenceFor conventional transition metal oxides and halide magnets, the dependence of the superexchange integral J on the spin-spin separation r is approximately given by J(r) ∼ r−10.J(r)∼r−10. This decay law can be extracted from experiments probing the pressure dependence of J; see, e.g., M. J. Massey et al., Phys. Rev. B 41, 8776 (1990).However, for the cuprates the exact value of the decay exponent is still not agreed upon. For instance, recent results of M. Aronson et al., Phys. Rev. B 44, 4657 (1991), predict an exponent of about −6.4±0.8.−6.4±0.8. Nevertheless, any of these values for the decay exponent gives a very strong dependence of J on the spin-spin separation, and our estimate for σ is not significantly affected by them.en_US
dc.identifier.citedreferenceP. Knoll et al., Phys. Rev. B 42, 4842 (1990).en_US
dc.owningcollnamePhysics, Department of


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