Anomalous paramagnetism of copper acetate
- 9 October 1952
- journal article
- Published by The Royal Society in Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
- Vol. 214 (1119), 451-465
- https://doi.org/10.1098/rspa.1952.0181
Abstract
The paramagnetic resonance spectrum of copper acetate is anomalous in that it resembles that of an ion of spin 1, and its intensity decreases as the temperature is lowered. The latter is correlated with the decreasing susceptibility found by Guha (1951). The following hypotheses are suggested: (1) the crystalline field acting on each copper ion is similar to that in other salts such as the Tutton salts; (2) isolated pairs of copper ions interact strongly through exchange forces, each pair forming a lower singlet state and an upper triplet state, the latter only being paramagnetic. On this basis both the fine structure and the hyperfine structure of the spectrum have a simple explanation, and the theory also predicts a small initial splitting of the triplet state of the same order as that found experimentally. The unit cell of the crystal contains two differently oriented pairs of ions, and, using an empirical value for the exchange parameter, fair agreement with the susceptibility measurements of Guha is obtained.Keywords
This publication has 8 references indexed in Scilit:
- The Exchange Integral in theShellPhysical Review B, 1952
- Anomalous paramagnetism and exchange interaction in copper acetateThe London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, 1952
- Paramagnetic Resonance Absorption of MicrowavesThe Journal of Chemical Physics, 1951
- Quadrupole Moments of Copper 63 and 65Proceedings of the Physical Society. Section A, 1951
- Exchange interaction of nickel ions in nickel fluosilicate crystalPhysica, 1951
- Interaction Between theShells in the Transition MetalsPhysical Review B, 1951
- Antiferromagnetism. Theory of Superexchange InteractionPhysical Review B, 1950
- On the theory of paramagnetic relaxationPhysica, 1943