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28 March 2024
 
  » arxiv » cond-mat/0606552

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Evidence of s-Wave Subdominant Order Parameter in YBCO from Break Junction Tunneling Spectra
A.I.Akimenko ; F.Bobba ; F.Giubileo ; V.Gudimenko ; A.Scarfato ; A.M.Cucolo ;
Date 21 Jun 2006
Subject Superconductivity
AbstractThe tunneling spectra of YBa2Cu3O7 break-junctions have been investigated for the tunneling direction close to the node one. 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<20-30K is in agreement with the theory for the dx2-y2(+-)is order parameter. The low (0.04T) magnetic field depresses significantly such a splitting. The 1/T temperature dependence of maximum Josephson current goes to saturation at T<Ts also confirming the mixed order parameter formation.
Source arXiv, cond-mat/0606552
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