{"title":"高温超导体(La1-xCax)(Ba1.75-xLa0.25 +x)Cu3Oy掺杂效应的43Ca NMR研究","authors":"Sébastien Marchand , Arlette Trokiner , Andrey Yakubovskii , Philippe Monod , Arkady Knizhnik , Yakov Eckstein","doi":"10.1016/S1387-1609(01)01339-1","DOIUrl":null,"url":null,"abstract":"<div><p>The <sup>43</sup>Ca nuclear magnetic resonance is measured in the normal state of the high temperature superconductor (Ca<em><sub>x</sub></em>La<sub>1–<em>x</em></sub>)(Ba<sub>1.75–<em>x</em></sub>La<sub>0.25+<em>x</em></sub>)Cu<sub>3</sub>O<sub><em>y</em></sub> as a function of temperature. The samples are chosen in order to compare the effect of changing the calcium and the oxygen contents in the underdoped regime. We determine the quadrupolar parameters and the Knight shift (KS). The macroscopic magnetic susceptibility is measured and used to estimate the <sup>43</sup>Ca hyperfine field. The variation of KS when increasing the calcium content does not show the signature of an increase of the doping level, contrary to what is suggested by the variation of macroscopic properties.</p></div>","PeriodicalId":100305,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry","volume":"4 11","pages":"Pages 819-824"},"PeriodicalIF":0.0000,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1387-1609(01)01339-1","citationCount":"2","resultStr":"{\"title\":\"43Ca NMR study of the doping effects in the high temperature superconductor (La1–xCax)(Ba1.75–xLa0.25+x)Cu3Oy\",\"authors\":\"Sébastien Marchand , Arlette Trokiner , Andrey Yakubovskii , Philippe Monod , Arkady Knizhnik , Yakov Eckstein\",\"doi\":\"10.1016/S1387-1609(01)01339-1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The <sup>43</sup>Ca nuclear magnetic resonance is measured in the normal state of the high temperature superconductor (Ca<em><sub>x</sub></em>La<sub>1–<em>x</em></sub>)(Ba<sub>1.75–<em>x</em></sub>La<sub>0.25+<em>x</em></sub>)Cu<sub>3</sub>O<sub><em>y</em></sub> as a function of temperature. The samples are chosen in order to compare the effect of changing the calcium and the oxygen contents in the underdoped regime. We determine the quadrupolar parameters and the Knight shift (KS). The macroscopic magnetic susceptibility is measured and used to estimate the <sup>43</sup>Ca hyperfine field. The variation of KS when increasing the calcium content does not show the signature of an increase of the doping level, contrary to what is suggested by the variation of macroscopic properties.</p></div>\",\"PeriodicalId\":100305,\"journal\":{\"name\":\"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry\",\"volume\":\"4 11\",\"pages\":\"Pages 819-824\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2001-11-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/S1387-1609(01)01339-1\",\"citationCount\":\"2\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1387160901013391\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1387160901013391","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
43Ca NMR study of the doping effects in the high temperature superconductor (La1–xCax)(Ba1.75–xLa0.25+x)Cu3Oy
The 43Ca nuclear magnetic resonance is measured in the normal state of the high temperature superconductor (CaxLa1–x)(Ba1.75–xLa0.25+x)Cu3Oy as a function of temperature. The samples are chosen in order to compare the effect of changing the calcium and the oxygen contents in the underdoped regime. We determine the quadrupolar parameters and the Knight shift (KS). The macroscopic magnetic susceptibility is measured and used to estimate the 43Ca hyperfine field. The variation of KS when increasing the calcium content does not show the signature of an increase of the doping level, contrary to what is suggested by the variation of macroscopic properties.
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