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

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

1997-06-27

arxiv.org/abs/cond-mat/9706286v1

Phys Rev Lett 80,1984 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

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.

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