Novel functional properties of charge-transition oxides synthesized under high pressure

Fig. 8. Temperature dependence of the refined Fe3+ magnetic

moment in NdCu3Fe4O12. The fitting for the refined moments

with an S = 5/2 Brillouin function is also shown in a dashed

curve.

expected to be RIn(2S + 1) = 79 J K¹1 kg¹1. The value is

more than 90 % of the observed total entropy change, and

thus, most of the magnetic entropy is concluded to be

responsible for the total entropy change. In normal secondorder magnetic transitions the magnetic entropies are gradually changed below the magnetic transition temperatures.

In the present NdCu3Fe4O12, in contrast, the magnetic

entropy is abruptly yielded by the unusual first-order

magnetic transition induced by the intermetallic-chargetransfer transition.

Because the intermetallic-charge-transfer transition temperature of LnCu3Fe4O12 is changed by the chemical substitution at the A-site,24)­26),33) similar fine control of the

effective operating temperature for the thermal control by

the caloric effect is also possible.

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Yuichi Shimakawa is a professor in Institute of Chemical Research, Kyoto University. He

received his Ph.D. from Kyoto University in 1993. He was a Principal Researcher in

Fundamental Research Laboratories, NEC Corporation, and then joined Kyoto University

as a Professor in 2003. His research interests are in the solid-state chemistry and materials

science of transition metal oxides, which have interesting and useful properties. The

research focuses on the search for new oxide materials with novel functional properties. He

is a Fellow of the Royal Society of Chemistry, UK.

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