Gan Zhai, William P Halperin, Arneil P Reyes, Sam Posen, Zuhawn Sung, Chiara Tarantini, Michael D Brown and David C Larbalestier
{"title":"Nuclear magnetic resonance investigation of superconducting and normal state Nb3Sn","authors":"Gan Zhai, William P Halperin, Arneil P Reyes, Sam Posen, Zuhawn Sung, Chiara Tarantini, Michael D Brown and David C Larbalestier","doi":"10.1088/1361-6668/ad5fbf","DOIUrl":null,"url":null,"abstract":"The superconductor Nb3Sn has important applications for construction of very high-field superconducting magnets. In this work we investigate its microscopic electronic structure with 93Nb nuclear magnetic resonance (NMR). The high-quality Nb3Sn powder sample was studied in both 3.2 T and 7 T magnetic fields in the temperature range from 4 K to 300 K. From measurement of the spectrum and its theoretical analysis, we find evidence for anisotropy despite its cubic crystal structure. Magnetic alignment of the powder grains in the superconducting state was also observed. The Knight shift and spin-lattice relaxation rate, , were measured and the latter compared with BCS theory for the energy gap at 3.2 T and at 7 T, indicating suppression of the order parameter by magnetic field.","PeriodicalId":21985,"journal":{"name":"Superconductor Science and Technology","volume":"7 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Superconductor Science and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1088/1361-6668/ad5fbf","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The superconductor Nb3Sn has important applications for construction of very high-field superconducting magnets. In this work we investigate its microscopic electronic structure with 93Nb nuclear magnetic resonance (NMR). The high-quality Nb3Sn powder sample was studied in both 3.2 T and 7 T magnetic fields in the temperature range from 4 K to 300 K. From measurement of the spectrum and its theoretical analysis, we find evidence for anisotropy despite its cubic crystal structure. Magnetic alignment of the powder grains in the superconducting state was also observed. The Knight shift and spin-lattice relaxation rate, , were measured and the latter compared with BCS theory for the energy gap at 3.2 T and at 7 T, indicating suppression of the order parameter by magnetic field.
超导体 Nb3Sn 在制造极高磁场超导磁体方面有着重要的应用。在这项工作中，我们利用 93Nb 核磁共振（NMR）研究了它的微观电子结构。我们在 3.2 T 和 7 T 的磁场中，在 4 K 至 300 K 的温度范围内对高质量 Nb3Sn 粉末样品进行了研究。我们还观察到超导状态下粉末颗粒的磁排列。我们测量了奈特位移和自旋晶格弛豫速率，并将后者与 BCS 理论在 3.2 T 和 7 T 时的能隙进行了比较，结果表明磁场抑制了阶次参数。
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