An electron paramagnetic resonance study of Pr_{0.6}Ca_{0.4}MnO_{3} across the charge ordering transition

Rajeev Gupta; Janhavi P. Joshi; S. V. Bhat; A. K. Sood; C. N. R. Rao

doi:10.1088/0953-8984/12/30/319

An electron paramagnetic resonance study of Pr_{0.6}Ca_{0.4}MnO_{3} across the charge ordering transition

Strongly Correlated Electrons 2009-10-31 v1

Authors: Rajeev Gupta , Janhavi P. Joshi , S. V. Bhat , A. K. Sood , C. N. R. Rao

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Abstract

We report the first electron paramagnetic resonance studies of single crystals and powders of Pr_{0.6}Ca_{0.4}MnO_{3} in the 300-4.2 K range, covering the charge ordering transition at ~ 240 K and antiferromagnetic transition (T_N) at ~ 170 K. The asymmetry parameter for the Dysonian single crystal spectra shows anomalous increase at T_{co}. Below T_{co} the g-value increases continuously, suggesting a gradual strengthening of orbital ordering. The linewidth undergoes a sudden increase at T_{co} and continues to increase down to T_N. The intensity increases as the temperature is decreased till T_{co} due to the renormalization of magnetic susceptibility arising from the build up of ferromagnetic correlations. The value of the exchange constant, J, is estimated to be 154 K.

Keywords

electron paramagnetic resonance Pr_{0.6}Ca_{0.4}MnO_{3} charge ordering transition antiferromagnetic transition orbital ordering

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@article{arxiv.cond-mat/0006073,
  title  = {An electron paramagnetic resonance study of Pr_{0.6}Ca_{0.4}MnO_{3} across the charge ordering transition},
  author = {Rajeev Gupta and Janhavi P. Joshi and S. V. Bhat and A. K. Sood and C. N. R. Rao},
  journal= {arXiv preprint arXiv:cond-mat/0006073},
  year   = {2009}
}

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An electron paramagnetic resonance study of Pr_{0.6}Ca_{0.4}MnO_{3} across the charge ordering transition

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