掺铅Bi:2201单晶赝隙的核磁共振证据

IF 1.3 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

JETP Letters Pub Date : 2025-07-15 DOI:10.1134/S0021364025607109

O. M. Vyaselev

{"title":"掺铅Bi:2201单晶赝隙的核磁共振证据","authors":"O. M. Vyaselev","doi":"10.1134/S0021364025607109","DOIUrl":null,"url":null,"abstract":"A 63Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi1.6Pb0.4Sr2.05CuOy, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin–lattice relaxation (SLR) rate reveal the pseudogap that opens near \\(T{\\text{*}} = 60\\) K, significantly above the superconducting critical temperature \\({{T}_{{\\text{c}}}} \\simeq 9 \\) K at the NMR experiment field, 7 T oriented H || c. The noticeable disparity between Tc and T * and the behavior of Cu SLR at \\(T > T{\\text{*}}\\) imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small (\\( \\approx \\)7 K) shift of the zero-field Tc0 = (16 ± 1) K under the applied 7 T field suggests high upper critical field, Hc2, unusual for compounds with as low Tc0.","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":"122 2","pages":"92 - 96"},"PeriodicalIF":1.3000,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0021364025607109.pdf","citationCount":"0","resultStr":"{\"title\":\"Nuclear Magnetic Resonance Evidence for a Pseudogap in a Pb-Doped Bi:2201 Single Crystal\",\"authors\":\"O. M. Vyaselev\",\"doi\":\"10.1134/S0021364025607109\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A 63Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi1.6Pb0.4Sr2.05CuOy, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin–lattice relaxation (SLR) rate reveal the pseudogap that opens near \\\\(T{\\\\text{*}} = 60\\\\) K, significantly above the superconducting critical temperature \\\\({{T}_{{\\\\text{c}}}} \\\\simeq 9 \\\\) K at the NMR experiment field, 7 T oriented H || c. The noticeable disparity between Tc and T * and the behavior of Cu SLR at \\\\(T > T{\\\\text{*}}\\\\) imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small (\\\\( \\\\approx \\\\)7 K) shift of the zero-field Tc0 = (16 ± 1) K under the applied 7 T field suggests high upper critical field, Hc2, unusual for compounds with as low Tc0.\",\"PeriodicalId\":604,\"journal\":{\"name\":\"JETP Letters\",\"volume\":\"122 2\",\"pages\":\"92 - 96\"},\"PeriodicalIF\":1.3000,\"publicationDate\":\"2025-07-15\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://link.springer.com/content/pdf/10.1134/S0021364025607109.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"JETP Letters\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0021364025607109\",\"RegionNum\":4,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"PHYSICS, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"JETP Letters","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S0021364025607109","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

摘要

用63Cu核磁共振（NMR）研究了一种掺铅Bi:2201体系Bi1.6Pb0.4Sr2.05CuOy。核磁共振峰移和核自旋-晶格弛豫（SLR）速率的温度依赖性揭示了赝隙在\(T{\text{*}} = 60\) K附近打开，明显高于核磁共振实验场超导临界温度\({{T}_{{\text{c}}}} \simeq 9 \) K， 7 T取向H || c。Tc和T *之间的显著差异以及\(T > T{\text{*}}\)处Cu SLR的行为暗示了所研究体系的欠掺杂状态。在施加的7t磁场下，零场Tc0 =(16±1)K的小位移（\( \approx \) 7 K）证明了磁场对超导性的影响相对较弱，这表明具有较高的上临界场Hc2，这对于具有低Tc0的化合物来说是不寻常的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Nuclear Magnetic Resonance Evidence for a Pseudogap in a Pb-Doped Bi:2201 Single Crystal

A ⁶³Cu nuclear magnetic resonance (NMR) study of a Pb-doped Bi:2201 system, Bi_1.6Pb_0.4Sr_2.05CuO_y, is presented. The temperature dependencies of the NMR peak shift and the nuclear spin–lattice relaxation (SLR) rate reveal the pseudogap that opens near \(T{\text{*}} = 60\) K, significantly above the superconducting critical temperature \({{T}_{{\text{c}}}} \simeq 9 \) K at the NMR experiment field, 7 T oriented H || c. The noticeable disparity between T_c and T * and the behavior of Cu SLR at \(T > T{\text{*}}\) imply the underdoped state of the studied system. A relatively weak effect of the magnetic field on the superconductivity evidenced from small (\( \approx \)7 K) shift of the zero-field T_c0 = (16 ± 1) K under the applied 7 T field suggests high upper critical field, H_c2, unusual for compounds with as low T_c0.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

JETP Letters 物理-物理：综合

CiteScore

2.40

自引率

30.80%

发文量

164

审稿时长

3-6 weeks

期刊介绍： All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.