Doping dependence of the low-energy excitations in superconducting Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+ delta /: evidence for thermal phase fluctuations (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Doping dependence of the low-energy excitations in superconducting Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+ delta /: evidence for thermal phase fluctuations (Articolo in rivista) (literal)

Anno

• 2003-01-01T00:00:00+01:00 (literal)

Alternative label

• Lamura G., Le Cochec J., Gauzzi A., Licci F., Di Castro D., Bianconi A., Bok J. (2003)
  Doping dependence of the low-energy excitations in superconducting Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+ delta /: evidence for thermal phase fluctuations
  
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Lamura G., Le Cochec J., Gauzzi A., Licci F., Di Castro D., Bianconi A., Bok J. (literal)

Pagina inizio

• 144518 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 67 (literal)

Note

• ISI Web of Science (WOS) (literal)

Titolo

• Doping dependence of the low-energy excitations in superconducting Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+ delta /: evidence for thermal phase fluctuations (literal)

Abstract

• By using a single-coil technique, we study the low-temperature dependence of the in-plane magnetic penetration depth lambda /sub ab/ in several Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub 8+ delta / (BSCCO) single crystals prepared with various doping levels delta ranging from the under- to the overdoped regime. Four samples exhibit a linear dependence of thermally activated low-energy excitations Delta lambda /sub ab/ identical to lambda /sub ab/(T)- lambda /sub ab/(0)~T. The thermal activation rate varies as delta lambda /sub ab// delta T is minimum, 8 AA/K, at optimum doping, in good quantitative agreement with the d-wave model of superconducting order parameter. The much larger rates, >or approximately=40 AA/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 coherence length like cuprates. One underdoped sample exhibits a quadratic dependence suggesting an incipient crossover from thermal to quantum fluctuations. (literal)

Prodotto di

• Istituto dei materiali per l'elettronica ed il magnetismo (IMEM) (Istituto)

Autore CNR

• ANDREA GAUZZI (Unità di personale interno)
• FRANCESCA GLORIA LICCI (Unità di personale interno)

Incoming links:

Prodotto

• Istituto dei materiali per l'elettronica ed il magnetismo (IMEM) (Istituto)

Autore CNR di

• FRANCESCA GLORIA LICCI (Unità di personale interno)
• ANDREA GAUZZI (Unità di personale interno)