Evidence of a s-wave subdominant order parameter in YBa2Cu3O7-d from break-junction tunneling spectra

Автор(и)

  • A.I. Akimenko Physics Department, CNR-Supermat Laboratory, University of Salerno, Via S. Allende; 84081 Baronissi, Italy
  • F. Bobba Physics Department, CNR-Supermat Laboratory, University of Salerno, Via S. Allende; 84081 Baronissi, Italy
  • F. Giubileo Physics Department, CNR-Supermat Laboratory, University of Salerno, Via S. Allende; 84081 Baronissi, Italy
  • V.A. Gudimenko B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • S. Piano Physics Department, CNR-Supermat Laboratory, University of Salerno, Via S. Allende; 84081 Baronissi, Italy
  • A.M. Cucolo Physics Department, CNR-Supermat Laboratory, University of Salerno, Via S. Allende; 84081 Baronissi, Italy

DOI:

https://doi.org/10.1063/1.3319499

Ключові слова:

tunneling spectra, Josephson current, zero-bias conductance peak.

Анотація

The tunneling spectra of YBa2Cu3O7–δ break-junctions have been investigated for the tunneling direction close to the node one. The behavior of the zero-bias conductance peak (ZBCP) and Josephson current have been studied with temperature and magnetic field. The observed deep splitting of ZBCP which starts at TS < 20–30 K is in agreement with the theory for the dx2–y2 ± is order parameter [Y. Tanuma, Y. Tanaka, and S. Kashiwaya, Phys. Rev. B64, 214519 (2001)]. We also observed that a low (0.04 T) magnetic field significantly depresses such splitting. The 1/ T temperature dependence of maximum Josephson current that goes to saturation at T<TS also confirms the mixed order parameter formation.

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Опубліковано

2010-02-03

Як цитувати

(1)
Akimenko, A.; Bobba, F.; Giubileo, F.; Gudimenko, V.; Piano, S.; Cucolo, A. Evidence of a s-Wave Subdominant Order Parameter in YBa2Cu3O7-d from Break-Junction Tunneling Spectra. Fiz. Nizk. Temp. 2010, 36, 212-216.

Номер

Том 36 № 2 (2010)

Розділ

Надпровідність, зокрема високотемпературна