Magnetic excitations in SrCu2O3: a Raman scattering study

Abstract

We investigated temperature dependent Raman spectra of the one-dimensional spin-ladder compound SrCu2O3. At low temperatures a two-magnon peak is identified at 3160+/-10 cm^(-1) and its temperature dependence analyzed in terms of a thermal expansion model. We find that the two-magnon peak position must include a cyclic ring exchange of J_cycl/J_perp=0.09-0.25 with a coupling constant along the rungs of J_perp approx. 1215 cm^(-1) (1750 K) in order to be consistent with other experiments and theoretical results.

4 pages, 3 figures

References in corpus (8)

• Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
• The Spin Dynamics of the Spin Ladder, Dimer Chain Material Sr14Cu24O41
• Effects of biquadratic exchange on the spectrum of elementary excitations in spin ladders
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• Cyclic Spin Exchange in Cuprate Spin Ladders
• Derivation of effective spin models from a three band model for CuO_2-planes
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• Optical Properties of the Spin-Ladder Compound Sr_{14}Cu_{24}O_{41}

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• Site Dilution in the Half-Filled One-Band Hubbard Model: Ring Exchange, Charge Fluctuations and Application to La2Cu_{1-x}(Mg/Zn)_xO4
• Antiferromagnetic ordering of energy levels for spin ladder with four-spin cyclic exchange: Generalization of the Lieb-Mattis theorem
• Raman study of spin excitations in the tunable quantum spin ladder Cu(Qnx)(Cl${}_{1-x}$Br${}_x$)${}_2$
• Raman resonance in spin S two-leg ladder systems