{"title":"YBCO晶体面内外磁化率随温度和空穴含量的变化","authors":"I. Kokanović, J. Cooper, K. Iida","doi":"10.1209/0295-5075/98/57011","DOIUrl":null,"url":null,"abstract":"We report new magnetic susceptibility and anisotropy data for single crystals of YBa2Cu3O6+x from x=0.38 to 0.95. We argue that the temperature (T) dependence of the magnetic anisotropy in the normal state well above Tc arises from a combination of the pseudogap and substantial g-factor anisotropy. With this interpretation we obtain onset temperatures for superconducting fluctuations over a wide range of x. For hole concentrations p<0.14 there are two extra contributions to the magnetic susceptibility and its anisotropy. We analyse these in terms of changes in the Van Vleck paramagnetism plus a significant paramagnetic contribution from an electron pocket at low fields in the region 0.084<p<0.135. This is where the superconducting transition temperature Tc(p) deviates from the usual parabolic law and where quantum oscillations and a negative Hall coefficient are observed.","PeriodicalId":171520,"journal":{"name":"EPL (Europhysics Letters)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2012-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Changes in the in- and out-of-plane magnetic susceptibility of YBCO crystals with temperature and hole content\",\"authors\":\"I. Kokanović, J. Cooper, K. Iida\",\"doi\":\"10.1209/0295-5075/98/57011\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report new magnetic susceptibility and anisotropy data for single crystals of YBa2Cu3O6+x from x=0.38 to 0.95. We argue that the temperature (T) dependence of the magnetic anisotropy in the normal state well above Tc arises from a combination of the pseudogap and substantial g-factor anisotropy. With this interpretation we obtain onset temperatures for superconducting fluctuations over a wide range of x. For hole concentrations p<0.14 there are two extra contributions to the magnetic susceptibility and its anisotropy. We analyse these in terms of changes in the Van Vleck paramagnetism plus a significant paramagnetic contribution from an electron pocket at low fields in the region 0.084<p<0.135. This is where the superconducting transition temperature Tc(p) deviates from the usual parabolic law and where quantum oscillations and a negative Hall coefficient are observed.\",\"PeriodicalId\":171520,\"journal\":{\"name\":\"EPL (Europhysics Letters)\",\"volume\":\"26 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2012-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"EPL (Europhysics Letters)\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1209/0295-5075/98/57011\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"EPL (Europhysics Letters)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1209/0295-5075/98/57011","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Changes in the in- and out-of-plane magnetic susceptibility of YBCO crystals with temperature and hole content
We report new magnetic susceptibility and anisotropy data for single crystals of YBa2Cu3O6+x from x=0.38 to 0.95. We argue that the temperature (T) dependence of the magnetic anisotropy in the normal state well above Tc arises from a combination of the pseudogap and substantial g-factor anisotropy. With this interpretation we obtain onset temperatures for superconducting fluctuations over a wide range of x. For hole concentrations p<0.14 there are two extra contributions to the magnetic susceptibility and its anisotropy. We analyse these in terms of changes in the Van Vleck paramagnetism plus a significant paramagnetic contribution from an electron pocket at low fields in the region 0.084