Size and dimensionality effects in superconducting Mo thin films
| Autor: | I. Fernandez-Martinez, Raquel González-Arrabal, Lourdes Fàbrega, M. Parra-Borderías, Javier Sesé, José Luis Costa-Krämer, Oscar Serrano Gil, Fernando Briones, Agustín Camón |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España) |
| Rok vydání: | 2011 |
| Předmět: |
Superconductivity
Materials science Film plane Type-I superconductor chemistry.chemical_element 02 engineering and technology 01 natural sciences Electrical resistivity and conductivity Condensed Matter::Superconductivity 0103 physical sciences Materials Chemistry Electrical and Electronic Engineering Thin film 010306 general physics Critical field Materiales Condensed matter physics Metals and Alloys Física Química 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry Molybdenum Ceramics and Composites 0210 nano-technology Type-II superconductor |
| Zdroj: | Superconductor Science Technololgy, ISSN 1361-6668, 2011, Vol. 24, No. 7 Archivo Digital UPM instname Digital.CSIC. Repositorio Institucional del CSIC |
| Popis: | Trabajo presentado a la: "European Conference on Applied Superconductivity (EUCAS)" celebrada del 18 al 23 de septiembre de 2011 en Holanda. Molybdenum is a low Tc, type I superconductor whose fundamental properties are poorly known. Its importance as an essential constituent of new high performance radiation detectors, the so-called transition edge sensors (TESs) calls for better characterization of this superconductor, especially in thin film form. Here we report on a study of the basic superconducting features of Mo thin films as a function of their thickness. The resistivity is found to rise and the critical temperature decreases on decreasing film thickness, as expected. More relevant, the critical fields along and perpendicular to the film plane are markedly different, thickness dependent and much larger than the thermodynamic critical field of Mo bulk. These results are consistent with a picture of type II 2D superconducting films, and allow estimates of the fundamental superconducting lengths of Mo. The role of morphology in determining the 2D and type II character of the otherwise type I molybdenum is discussed. The possible consequences of this behaviour on the performance of radiation detectors are also addressed. This work has been supported by the Spanish Ministerio de Ciencia e Innovación, MCINN (projects ESP2006-13608-C02, AYA2008-00591/ESP, MAT2008-01077/NAN and MAT2009-13977-C03). OG and MPB thank MCINN for their fellowships. |
| Databáze: | OpenAIRE |
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