EPR of Cu²⁺-doped tris-sarcosine calcium chloride

Abstract

The EPR study of the Cu²⁺-doped tris-sarcosine calcium chloride (TSCC) at room temperature is reported. Two magnetically inequivalent sites for Cu²⁺ were observed. The rhombic spin Hamiltonian parameters are determined by fitting the EPR spectra for two centres: Cu²⁺(I) g₁ = 2.0276, g₂ = 2.0517, g₃ = 2.4019, A₁ = 82, A₂ = 128, A₃ = 152 [G] and Cu²⁺(II) g₁ = 2.0231, g₂ = 2.0368, g₃ = 2.5294, A₁ = 76, A₂ = 92, A₃ = 156 [G]. The ground state wave function is also determined. The g-anisotropy is evaluated and compared with the experimental value. Further, the optical study of the crystal at room temperature is carried out and the nature of bonding in the complex is discussed.

Keywords:

• spin Hamiltonian
• rhombic symmetry
• optical absorption
• MO coefficients

2000 Mathematics Subject Classifications::

• PACS No: 76.30

Acknowledgements

The authors thank the Head of Department of Physics, University of Allahabad for providing departmental facilities. We also thank Dr S. K. Gupta, National Physical Laboratory, New Delhi for providing EPR spectrometer facilities. One of the authors, M. P. Yadav thanks Dr B. N. Misra for valuable discussions and encouragement.