Doping dependence of the low-energy excitations in superconducting Bi2Sr2CaCu2O8-d : Evidence for thermal phase fluctuations (Articolo in rivista)

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  • Doping dependence of the low-energy excitations in superconducting Bi2Sr2CaCu2O8-d : Evidence for thermal phase fluctuations (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.67.144518 (literal)
Alternative label
  • G. Lamura, J. Le Cochec, A. Gauzzi, F. Licci, D. Di Castro, A. Bianconi, J. Bok (2003)
    Doping dependence of the low-energy excitations in superconducting Bi2Sr2CaCu2O8-d : Evidence for thermal phase fluctuations
    in Physical review. B, Condensed matter and materials physics (Online)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. Lamura, J. Le Cochec, A. Gauzzi, F. Licci, D. Di Castro, A. Bianconi, J. Bok (literal)
Pagina inizio
  • 144518 (literal)
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  • http://prb.aps.org/ (literal)
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  • 67 (literal)
Rivista
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  • 7 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • Laboratoire de physique du solide, ESPCI 10, rue Vauquelin, 75231 Paris, France Istituto Materiali per Elettronica e Magnetismo - Consiglio Nazionale delle Ricerche Area delle Scienze, 43010 Parma, Italy Dipartimento di Fisica and INFM, Universita` di Roma ''La Sapienza'' P.le Aldo Moro 4, 00185 Roma, Italy (literal)
Titolo
  • Doping dependence of the low-energy excitations in superconducting Bi2Sr2CaCu2O8-d : Evidence for thermal phase fluctuations (literal)
Abstract
  • By using a single-coil technique, we study the low-temperature dependence of the in-plane magnetic pen- etration depth l ab in several Bi 2 Sr 2 CaCu 2 O 8 1d ~ BSCCO ! single crystals prepared with various doping levels d ranging from the under- to the overdoped regime. Four samples exhibit a linear dependence of thermally activated low-energy excitations Dl ab [l ab (T) 2l ab (0) ; T. The thermal activation rate }] l ab / ] T is mini- mum, 8 Å/K, at optimum doping, in good quantitative agreement with the d-wave model of superconducting order parameter. The much larger rates, * 40 Å/K, observed in all under- and overdoped samples indicate that, in these samples, another type of low-energy excitations is relevant. These large rates are quantitatively consistent with a model of thermal phase fluctuations suitable for granular superconductors with short coher- ence length like cuprates. One underdoped sample exhibits a quadratic dependence suggesting an incipient crossover from thermal to quantum fluctuations. (literal)
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