PHASE TRANSITIONS IN ANTIFERROMAGNETS IN EXTERNAL MAGNETIC FIELDS: MOSSBAUER SPECTRO SCOpy
نویسنده
چکیده
Known antiferronlagnetic nlaterials far out nwnber known ferronlagnetic and ferrinlagnetic nlaterials. More over, the antife rronlagnets display a wide variety of phase transitions in addition to the paranlagnetic to antiferro nlagnetic transition at the Neel point, that nlake thenl a rich source of infornlation about the relations hip between exchange interactions, structure, and phase transition phenonlena. Mossbauer spectroscopy has been used ex tensively over the last decade to study antiferrornagnets, capitalizing on the fact that the nlagneti c hyperfine field is proportional to the sublattice nlagnetization. In general, these studies have concentrated on deternlining the nlagnetic structure below TN and the sublattice nlagnetization as a function of T below TN' in SOnle cases in the critical region. Less well stuCiied are those transitions in anti ferronlagnets which are induced by external nlagnetic fields, although in these cases too, Mo'ssbauer spectro scopy can provide inlportant and often unique infornlation.
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تاریخ انتشار 2010