Determination of exchange interactions in Cu(NH<sub>4</sub>)<sub>2</sub>Cl<sub>4</sub>.2H<sub>2</sub>O and CuK<sub>2</sub>Cl<sub>4</sub>.2H<sub>2</sub>O
David W. WoodDepartment of Mathematics, University of NottinghamN W DaltonDepartment of Theoretical Physics, Atomic Energy Research Establishment, Harwell, Didcot, Berks
1966en
ABI
Abstract
The theory of the Heisenberg ferromagnet with first- and second-neighbour interactions is compared with recent experimental work on two copper salts. Exact series and Padé approximant extrapolations are used at high temperatures and non-interacting spin-wave theory at low temperatures. We find values for the exchange parameters ensure close agreement between theory and experiment at both high and low temperatures.
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