High-Frequency ESR Measurements of S = 1/2 1-D Heisenberg Antiferromagnetic Zig-Zag Chain (VO)(SO4)(2,2-bpy)
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High-frequency electron spin resonance (ESR) measurements of S = 1/2 one-dimensional Heisenberg antiferromagnetic zig-zag chain substance (VO)(SO4)(2,2-bpy) were performed in the temperature region from 1.8 to 265 K. ESR measurements at 265 K show typical powder pattern spectra of the V4+ ion and g || = 1.925 ± 0.001 and g ⊥ = 1.976 ± 0.001 were obtained. Although the magnetic susceptibility shows a maximum at 3.1 K suggesting the existence of a short-range order, no g-shift and line width broadening were observed down to 1.8 K. We suggest that these temperature-independent features of ESR can be attributed to the result of frustration in (VO)(SO4)(2,2-bpy).
KeywordsElectron Spin Resonance Electron Spin Resonance Spectrum Quantum Phase Transition Pulse Magnetic Field Orbital State
H.O. acknowledges Prof. Shojiro Kimura of Institute for Materials Research, Tohoku University, for valuable discussions. This study was partly supported by the grant-in-aid for Scientific Research on Priority Area (grant no. 19052005) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. N.T. would like to acknowledge also the financial support from the Motizuki Fund of Yukawa Memorial Foundation.
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