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|Type:||Artigo de periódico|
|Title:||Magnetic Properties Of Cu(l-aspartato)(h22o)2: An Alternating Linear Chain Antiferromagnet|
|Abstract:||Specific heat [c(7)] and magnetization data [M(B,7)] were obtained in the copper complex of the amino acid L-aspartic acid [called Cu(L-asp)J. c(7) was measured between 3 and 15 K, where it is largest. M(B,7) was measured in the temperature range between 1. 8 and 300 K for magnetic fields up to 9 Tesla. The c(7) and the susceptibility y_(T) curves show peaks at 3. 95 K and 6. 9 K, respectively, and approach zero at lower and higher temperatures. The data are well fitted proposing for Cu(L-asp) a behavior characteristic of an alternating linear chain antiferromagnet, where each S=l/2 copper ion is coupled with a magnitude J0 with one copper neighbor in the chain, and with oJ0 with the other. We evaluate an antiferromagnetic coupling parameter JJk -5. 3 K and cc= 0. 29, and g = 2. 165±0. 001 for the average g-value. A ferromagnetic coupling with a magnitude J'/k = 0. 7 K between neighbor chains, is also estimated using a mean field approach. The alternating chain behavior indicates that, besides the exchange interactions transmitted through the o-skeleton of the amino acid, interactions paths involving H-bonds are also important. © 1999 Trans Tech Publications.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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