High-field Electron Spin Resonance of Cu_{1-x}Zn_{x}GeO_{3}

Abstract

High-Field Electron Spin Resonance measurements were made on powder samples of Cu_{1-x}Zn_{x}GeO_{3} (x=0.00, 0.01, 0.02, 0.03 and 0.05) at different frequencies (95, 110, 190, 220, 330 and 440 GHz) at low temperatures. The spectra of the doped samples show resonances whose positions are dependent on Zn concentration, frequency and temperature. The analysis of intensity variation of these lines with temperature allows us to identify them as originating in transitions within states situated inside the Spin Peierls gap. A qualitative explanation of the details of the spectra is possible if we assume that these states in the gap are associated with "loose" spins created near the Zn impurities, as recently theoreticaly predicted. A new phenomenon of quenching of the ESR signal across the Dimerized to Incommensurate phase-boundary is observed.

4 pages, 5 ps figures in the text, submitted to Phys. Rev. Lett

References in corpus (1)

• Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities

Cited by in corpus (7)

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• Electron Spin Resonance of Ni-doped CuGeO${}_3$ in the paramagnetic, spin-Peierls and antiferromagnetic states: Comparison with non-magnetic impurities
• Dynamics of solutions of the Einstein equations with twisted Gowdy symmetry
• Effect of Spin-1 Impurities in Dimerized Heisenberg Chains
• Modulated Phases in Spin-Peierls Systems