The Susceptibility and Magnetic Specific Heat of Potassium Ferricyanide at Low Temperatures
F R McKim; W P Wolf; F R McKim; The Clarendon Laboratory, Oxford University; W P Wolf; The Clarendon Laboratory, Oxford University
Журнал:
Proceedings of the Physical Society. Section B
Дата:
1956-12-01
Аннотация:
The temperature variation of the susceptibility of single crystals of potassium ferricyanide has been measured between 20° and 1°K, using an a.c. mutual inductance method. The results of measurements along each of the three crystalline axes were fitted to expressions of the form χ<sub>x</sub> = (λ<sub>x</sub>/T)(1 + Δ<sub>x</sub>/T + ...) and values of λ<sub>x</sub> and δ<sub>x</sub> deduced. It was found that the effect of higher order terms was very small. The magnetic specific heat was measured at 1.05°K using the relaxation method.An attempt was made to relate the values of δ to the measured specific heat and paramagnetic resonance line width, on the basis of exchange interaction with n equivalent nearest neighbours. It was found, however, that only approximate agreement could be obtained, and this with the rather small value of n = 2.
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