The characteristic electron–phonon coupling time of unconventional superconductors and implications for optical detectors
| Autor: | Loredana Parlato, Roberto Cristiano, Roman Sobolewski, Giovanni Piero Pepe, G. Peluso, R. Latempa |
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| Přispěvatelé: | Parlato, Loredana, Latempa, R., Peluso, G., Pepe, GIOVANNI PIERO, Cristiano, R., Sobolewski, R. |
| Rok vydání: | 2005 |
| Předmět: |
Superconducting coherence length
Superconductivity Physics Physics and Astronomy (miscellaneous) Condensed matter physics Phonon Scattering Metals and Alloys Condensed Matter Physic Condensed Matter Physics Electronic Optical and Magnetic Materials symbols.namesake Condensed Matter::Superconductivity Materials Chemistry Ceramics and Composites Quasiparticle symbols Superconducting tunnel junction Electrical and Electronic Engineering Cooper pair Debye |
| Zdroj: | Superconductor Science and Technology. 18:1244-1251 |
| ISSN: | 1361-6668 0953-2048 |
| Popis: | Superconductors are highly suitable materials for radiation detection. Several detector types have been proposed, with properties of fast detection or high wavelength resolution over a wide range of optical frequencies. Their performances depend on the relaxation processes involving phonons, quasiparticles and Cooper pairs occurring during the energy cascade following the absorption of the radiation in the superconductor. The energy down-conversion processes are related to the electron–phonon scattering strength λe−ph which is usually expressed in terms of the electron–phonon coupling time, τ0, which is characteristic for each material. In this paper we estimate the value of τ0 for several classes of superconducting materials not yet investigated. It is calculated in the framework of the McMillan model for the superconducting critical temperature Tc within the Debye approximation. The values obtained for τ0 are discussed as regards new possibilities for unexplored materials in the field of superconducting detectors. In particular, we focus our attention on materials with τ0 values that could play a significant role in both hot electron photodetectors and superconducting tunnel junction devices. |
| Databáze: | OpenAIRE |
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