Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1804832 | Journal of Magnetism and Magnetic Materials | 2007 | 7 Pages |
Abstract
EPR study of Mn2+-doped lithium hydrogen oxalate monohydrate single crystals are done at room temperature. The Mn2+ spin-Hamiltonian parameters are evaluated employing a large number of resonant line positions observed for different orientations of the external magnetic field. The values of g, A, B, D, E and a are 1.9942±0.0002, 114±2Ã10â4, 103±2Ã10â4, 180±2Ã10â4, 57±2Ã10â4 and 7±1Ã10â4 cmâ1, respectively. The optical absorption study of the crystal is also done. The observed bands are assigned as transitions from the 6A1g(S) ground state to various excited quartet levels of Mn2+ ion in a cubic crystalline field. These bands are fitted with four parameters, inter-electronic repulsion parameters (B and C), crystal field parameter (Dq) and Tree's correction (α). The values found for the parameters are B=814 cmâ1, C=2255 cmâ1, Dq=780 cmâ1, and α=76 cmâ1. On the basis of the data obtained, the surrounding crystalline field and the nature of metal-ligand bonding are discussed.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ram Kripal, Har Govind, Manju Maurya,