Influence of fluctuation conductivity on the high-field magnetoresistivity in epitaxial La2−xSrxCuO4 thin films
| Autor: | V. Mashkautsan, Patrick Wagner, Victor Moshchalkov, Johan Vanacken, L. Weckhuysen, T. Wambecq |
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| Rok vydání: | 2004 |
| Předmět: |
Superconductivity
Materials science High-temperature superconductivity Magnetoresistance Condensed matter physics Band gap Conductivity Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention Condensed Matter::Materials Science law Condensed Matter::Superconductivity Phase (matter) Condensed Matter::Strongly Correlated Electrons Electrical and Electronic Engineering Thin film Pseudogap |
| Zdroj: | Physica B: Condensed Matter. :339-343 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2004.01.102 |
| Popis: | A large positive magnetoresistivity (up to tens of percents) is observed for underdoped superconducting La 2-x Sr x CuO 4 epitaxial thin films at temperatures far above the superconducting critical temperature T c . For the underdoped samples, this magnetoresistance far above T c cannot be described solely by the Kohler effect and we believe it is to be attributed to the influence of superconducting fluctuations or the existence of preformed pairs. In the underdoped regime, the large magnetoresistance is only observed when low-temperatures superconductivity occurs. The strong magnetoresistivity, which persists even at temperatures far above T c , can be related to the pairs forming the superconducting phase below T c . Our observations support the idea of a close relation between the pseudogap and the superconducting gap and provide new indications for the presence of pairs above T c . |
| Databáze: | OpenAIRE |
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