Theoretical interpretation of the antiferromagnetic resonance in copper chloride
Abstract
A theoretical interpretation is given of the results of the antiferro-magnetic resonance absorption measurements on hydrated copper chloride, CuCl 2·2H 2O 1) 2), using the theory of antiferromagnetic resonance at zero temperature developed in an earlier paper 3), as well as the theory of Yosida 4). With help of the former theory a satisfactory fit of the theoretical resonance fields in the coordinate planes of field space with the experimental resonance fields at the lowest temperatures is obtained using Hinc = c/ μinx; = 6.56 k, Hb = b/ μinx = 11.71 k and Ha = q/ μinx = 9.71 k, a, b, c and μinx being quantities occurring in Gorter and Haantjes' 5) theory of static antiferromagnetism. Using the theory of Yosida the absorption fields along the x-axis as functions of temperature are discussed. At temperatures above 2.4°K the higher absorption field coincides with the critical field strength Hc at which the spins flop over. Using an Hc, T-curve, determined by these values and by Hc = 6.56 k at the lowest temperatures, and an α, T-curve (α = 1 χ∥/ χ⊥) determined by susceptibility measurements 7), a satisfactory fit between theoretical and experimental values of the lower resonance field is obtained. Also an interpretation of the asymmetrical line shapes and the threshold absorption is found.
- Publication:
-
Physica
- Pub Date:
- 1953
- DOI:
- 10.1016/S0031-8914(53)80103-5
- Bibcode:
- 1953Phy....19..919U