{"title":"FeCl2超磁体理论","authors":"Z. Onyszkiewicz, A. Wierzbicki","doi":"10.1016/0378-4363(88)90299-9","DOIUrl":null,"url":null,"abstract":"<div><p>Two-sublattice collinear Heisenberg-Ising (<em>S</em>=1) metamagnets with uniaxial four-ion anisotropy are investigated by the high-density expansion method. Formulas in approximation including Gaussian fluctuations of the molecular field for magnetization and free energy are obtained. The magnon frequencies are obtained in approximation including free magnons in the molecular field fluctuating in a Gaussian way. The theoretical results fitted for the FeCl<sub>2</sub> metamagnet yield phase diagram and magnon frequencies in better agreement with the experimental results than other existing theories.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":"151 3","pages":"Pages 462-474"},"PeriodicalIF":0.0000,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90299-9","citationCount":"8","resultStr":"{\"title\":\"Theory of FeCl2 metamagnet\",\"authors\":\"Z. Onyszkiewicz, A. Wierzbicki\",\"doi\":\"10.1016/0378-4363(88)90299-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Two-sublattice collinear Heisenberg-Ising (<em>S</em>=1) metamagnets with uniaxial four-ion anisotropy are investigated by the high-density expansion method. Formulas in approximation including Gaussian fluctuations of the molecular field for magnetization and free energy are obtained. The magnon frequencies are obtained in approximation including free magnons in the molecular field fluctuating in a Gaussian way. The theoretical results fitted for the FeCl<sub>2</sub> metamagnet yield phase diagram and magnon frequencies in better agreement with the experimental results than other existing theories.</p></div>\",\"PeriodicalId\":101023,\"journal\":{\"name\":\"Physica B+C\",\"volume\":\"151 3\",\"pages\":\"Pages 462-474\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1988-08-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/0378-4363(88)90299-9\",\"citationCount\":\"8\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physica B+C\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/0378436388902999\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B+C","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0378436388902999","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Two-sublattice collinear Heisenberg-Ising (S=1) metamagnets with uniaxial four-ion anisotropy are investigated by the high-density expansion method. Formulas in approximation including Gaussian fluctuations of the molecular field for magnetization and free energy are obtained. The magnon frequencies are obtained in approximation including free magnons in the molecular field fluctuating in a Gaussian way. The theoretical results fitted for the FeCl2 metamagnet yield phase diagram and magnon frequencies in better agreement with the experimental results than other existing theories.
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