{"title":"YBa2Cu3O7−δ和DyBa2Cu3O7−δ超导体的低温结电阻由超流密度决定","authors":"Doyel Rakshit, Sourav Das, Ajay Kumar Ghosh","doi":"10.1016/j.supcon.2023.100070","DOIUrl":null,"url":null,"abstract":"<div><p>Resistances of grain junctions of bulk polycrystalline YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<em>δ</em></sub> (YBCO) and DyBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<em>δ</em></sub> (DyBCO) superconductors have been extracted following (i) Ambegaokar- Baratoff (AB) and (ii) de Gennes (dG) equations. Current–voltage (<em>IV</em>) below the critical temperature (<span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></math></span>) has been used to extract transport critical current density (<span><math><mrow><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></math></span>). The variations of the junction resistances, (<span><math><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>N</mi></mrow></msub></mrow></math></span>) with temperature (<em>T</em>) exhibit that below a critical value of the normalised superfluid density (NSD), junctions become very low resistive and exhibit metallicity. Dependence of this feature of <span><math><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>N</mi></mrow></msub></mrow></math></span> on the energy gaps has also been explored. Weak scattering limit is found to be compatible with the maximum of <span><math><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>N</mi></mrow></msub></mrow></math></span> (<em>T</em>) as is observed from the corresponding NSD.</p></div>","PeriodicalId":101185,"journal":{"name":"Superconductivity","volume":"8 ","pages":"Article 100070"},"PeriodicalIF":5.6000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2772830723000352/pdfft?md5=5963ffa6ba26b554a9398b52332dbed2&pid=1-s2.0-S2772830723000352-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Superfluid density dominated junction resistance of bulk polycrystalline YBa2Cu3O7−δ and DyBa2Cu3O7−δ superconductors at low temperature\",\"authors\":\"Doyel Rakshit, Sourav Das, Ajay Kumar Ghosh\",\"doi\":\"10.1016/j.supcon.2023.100070\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Resistances of grain junctions of bulk polycrystalline YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<em>δ</em></sub> (YBCO) and DyBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−<em>δ</em></sub> (DyBCO) superconductors have been extracted following (i) Ambegaokar- Baratoff (AB) and (ii) de Gennes (dG) equations. Current–voltage (<em>IV</em>) below the critical temperature (<span><math><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></math></span>) has been used to extract transport critical current density (<span><math><mrow><msub><mrow><mi>J</mi></mrow><mrow><mi>c</mi></mrow></msub></mrow></math></span>). The variations of the junction resistances, (<span><math><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>N</mi></mrow></msub></mrow></math></span>) with temperature (<em>T</em>) exhibit that below a critical value of the normalised superfluid density (NSD), junctions become very low resistive and exhibit metallicity. Dependence of this feature of <span><math><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>N</mi></mrow></msub></mrow></math></span> on the energy gaps has also been explored. Weak scattering limit is found to be compatible with the maximum of <span><math><mrow><msub><mrow><mi>R</mi></mrow><mrow><mi>N</mi></mrow></msub></mrow></math></span> (<em>T</em>) as is observed from the corresponding NSD.</p></div>\",\"PeriodicalId\":101185,\"journal\":{\"name\":\"Superconductivity\",\"volume\":\"8 \",\"pages\":\"Article 100070\"},\"PeriodicalIF\":5.6000,\"publicationDate\":\"2023-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2772830723000352/pdfft?md5=5963ffa6ba26b554a9398b52332dbed2&pid=1-s2.0-S2772830723000352-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Superconductivity\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2772830723000352\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, ELECTRICAL & ELECTRONIC\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Superconductivity","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772830723000352","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
摘要
根据(i) Ambegaokar- Baratoff (AB)方程和(ii) de Gennes (dG)方程，计算了块体多晶YBa2Cu3O7−δ (YBCO)和DyBa2Cu3O7−δ (DyBCO)超导体晶粒结的电阻。使用低于临界温度(Tc)的电流-电压(IV)来提取输运临界电流密度(Jc)。结电阻(RN)随温度(T)的变化表明，在归一化超流体密度(NSD)的临界值以下，结的电阻变得非常低，并表现出金属丰度。我们还探讨了RN的这一特征对能隙的依赖性。弱散射极限与相应的NSD观测到的RN (T)最大值是相容的。
Superfluid density dominated junction resistance of bulk polycrystalline YBa2Cu3O7−δ and DyBa2Cu3O7−δ superconductors at low temperature
Resistances of grain junctions of bulk polycrystalline YBa2Cu3O7−δ (YBCO) and DyBa2Cu3O7−δ (DyBCO) superconductors have been extracted following (i) Ambegaokar- Baratoff (AB) and (ii) de Gennes (dG) equations. Current–voltage (IV) below the critical temperature () has been used to extract transport critical current density (). The variations of the junction resistances, () with temperature (T) exhibit that below a critical value of the normalised superfluid density (NSD), junctions become very low resistive and exhibit metallicity. Dependence of this feature of on the energy gaps has also been explored. Weak scattering limit is found to be compatible with the maximum of (T) as is observed from the corresponding NSD.
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