Pub Date : 2009-01-01DOI: 10.4028/0-87849-432-4.2051
Feng Qing-rong
Poly-crystalline MgB2 films have been grown on niobium substrate by using the hybrid physical-chemical vapor deposition (HPCVD) with a thickness about 1.5μm,which have good transport performance with Tc=39.37K,ΔTc=0.45K. Films are composed of regular plate-shape hexagonal MgB2 crystallites and have lattice constants approaching the bulk values. For this sample,the bending test has been also performed,and it can be found that the film adhered on the substrate firmly and could keep its superconductivity after bending to 120°.
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Pub Date : 2003-04-02DOI: 10.1103/PhysRevB.67.134504
F. Yuan, Jihong Qin, S. Feng, Wei Yeu Chen
Within the t-J model, we study the charge transport in underdoped bilayer cuprates by considering the bilayer interaction. Although the bilayer interaction leads to the band splitting in the electronic structure, the qualitative behavior of the charge transport is the same as in the case of single layer cuprates. The conductivity spectrum shows a low-energy peak and the unusual midinfrared band. This midinfrared band is suppressed severely with increasing temperatures, while the resistivity in the heavily underdoped regime is characterized by a crossover from the high temperature metallic-like to the low temperature insulating-like behaviors, which are consistent with the experiments.
{"title":"CHARGE TRANSPORT IN UNDERDOPED BILAYER CUPRATES","authors":"F. Yuan, Jihong Qin, S. Feng, Wei Yeu Chen","doi":"10.1103/PhysRevB.67.134504","DOIUrl":"https://doi.org/10.1103/PhysRevB.67.134504","url":null,"abstract":"Within the t-J model, we study the charge transport in underdoped bilayer cuprates by considering the bilayer interaction. Although the bilayer interaction leads to the band splitting in the electronic structure, the qualitative behavior of the charge transport is the same as in the case of single layer cuprates. The conductivity spectrum shows a low-energy peak and the unusual midinfrared band. This midinfrared band is suppressed severely with increasing temperatures, while the resistivity in the heavily underdoped regime is characterized by a crossover from the high temperature metallic-like to the low temperature insulating-like behaviors, which are consistent with the experiments.","PeriodicalId":66594,"journal":{"name":"低温物理学报","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85681750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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