2001/06/07 by Yoram Dagan, Y Dagan, Guy Deutscher +1 · 1 citation
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Topological Materials and Phenomena #cond-mat.supr-con
paper · pdf · doi:10.1209/epl/i2002-00480-8
5 figures
arxiv created 2001/06/07 · openalex publication_date 2002/02/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We have studied the Zero-Bias Conductance Peak (ZBCP) of the tunneling conductance measured on (1,1,0)-oriented Y 1 − y Ca y Ba 2 Cu 3 O 7 − x thin films as a function of doping and of magnetic field. A spontaneous (zero field) split of the ZBCP was observed only in overdoped samples (either by O or by Ca). The magnitude of this split was found to be linear in doping. All samples exhibited a magnetic-field splitting, also strongly doping dependent. The field susceptibility χ = (dδ/d H )| H → 0 diverges at the point at which spontaneous ZBCP splitting occurs, its inverse value, χ −1 , following a linear doping dependence on both the underdoped and overdoped sides. We discuss these results in terms of recent theoretical models of Time Reversal Symmetry Breaking (TRSB).