Title The relation between magnetization and internal energy for ferromagnets Fe, Ni, and electron-doped $In_{2}O_{3}:Cr$, antiferromagnetically ordered Zn $Cu_{3}(OH)_{6}Cl_{2}$, and the layered material $\kappa-(BEDT-TTF)_{2}$ $Cu[N(CN)_{2}]Cl$The relation between magnetization and internal energy for ferromagnets Fe, Ni, and electron-doped $In_{2}O_{3}:Cr$, antiferromagnetically ordered Zn $Cu_{3}(OH)_{6}Cl_{2}$, and the layered material $\kappa-(BEDT-TTF)_{2}$ $Cu[N(CN)_{2}]Cl$ Author March, N.H. Faculty/Department Faculty of Sciences. Physics Research group Department of Physics Publication type article Publication 2009New York, N.Y., 2009 Subject Physics Source (journal) International journal of quantum chemistry. - New York, N.Y. Volume/pages 109(2009):15, p. 3819-3826 ISSN 0020-7608 ISI 000271404600033 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract Grout and March utilized the exact solution of the two-dimensional Ising model to relate the internal energy E(T) to the magnetization M(T). These authors then used Bloch spin-wave theory to relate E and M at low temperatures for both insulating and metallic ferromagnets in three dimensions. Ayuela and March, very recently, have used experimental data on the specific heat and the magnetization to show that for metallic Fe and Ni the E - M data collapse on to a single curve. A model with long-range exchange interactions is presented to allow insight to be gained into this feature. Reference is also made briefly to the ferromagnetism of the electron-doped In2 O3:Cr system. Two antiferromagnetically ordered materials are next considered, though now more qualitatively than for the ferromagnets. The first is the spin -1/2 kagome antiferromagnet ZnCu3(OH)6 Cl2, and the second is the -phase layered material (BEDT-TTF)2 Cu[N(CN)2]Cl. Anomalous low-temperature specific heat Cv (T) is emphasized, with an enhancement that is reduced by application of a magnetic field. Further work is proposed, both experiment and theory, to understand the precise nature of the low-lying magnetic excitations in the latter -phase material. E-info http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000271404600033&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000271404600033&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle