Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)

Korean Magnetic Resonance Society (한국자기공명학회)
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Electron Spin Resonance Investigation of Fe3+ in Crystalline LiNbO3 Under the Polarized External Radiation

  • Park, Jung-Il (Nano-Physics and Technology Laboratory, Department of Physics, Kyungpook National University) ;
  • Cheong, Hai-Du (Division of Liberal Arts, Hanbat National University)
  • Received : 2013.11.10
  • Accepted : 2013.12.18
  • Published : 2013.12.20
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Abstract

We study the electron spin resonance line-width (ESRLW) of $Fe^{3+}$ in crystalline $LiNbO_3$ ; the ESRLW is obtained using the projection operator method (POM) developed by Argyres and Sigel. The ESRLW is calculated to be axially symmetric about the c-axis and is analyzed by the spin Hamiltonian with an isotopic g factor at a frequency of 9.5 GHz. The ESRLW increases exponentially as the temperature increases, and the ESRLW is almost constant in the high-temperature region (T>8000 K). This kind of temperature dependence of the ESRLW indicates a motional narrowing of the spectrum when $Fe^{3+}$ ions substitute the $Nb^{5+}$ ions in an off-center position. It is clear from this feature that there are two different regions in the graph of the temperature dependence of the ESRLW.

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