An electron spin resonance study of Mn2+ doped calcium hydrazine carboxylate monohydrate

Abstract

Single crystals of calcium hydrazine carboxylate, monohydrate have been studied by ESR of Mn2+ doped in the calcium sites. X-band ESR indicated a large crystal field splitting necessitating experiments at Q band. The analysis shows two magnetically inequivalent (but chemically equivalent) sites with gxx = 2.0042±0.0038, gyy=2.0076 ±0.0029, gzz=2.0314±0.001, Azz=0.0099±0.0002 cm-1, Axx=0.0092±0.0002 cm-1, Ayy=0.0082±0.0002 cm-1, D=3/2 Dzz=0.0558±0.0006 cm-1, and E=1/2 (Dyy-Dyy)=0.0127±0.0002 cm-1. One of the principal components of the crystal field, (Dzz), is found to be along the Ca ↔ Ca direction in the structure and a second one, (Dxx), along the perpendicular to the plane of the triangle formed by three neighbouring calciums. The A tensor is found to have an orientation different from that of the g and D tensors reflecting the low symmetry of the Ca2+ sites. © 1994 Indian Academy of Sciences.