On the origin of time reversal symmetry breaking in y
School of Physics and Astronomy, Raymond and Beverly Sackler
Faculty of Exact Sciences - 69978 Tel Aviv, Israel
Corresponding author: email@example.com
Accepted: 8 November 2001
We have studied the Zero-Bias Conductance Peak (ZBCP) of the tunneling conductance measured on (1,1,0)-oriented y 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 or by ). 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 diverges at the point at which spontaneous ZBCP splitting occurs, its inverse value, , 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).
PACS: 74.72.-h – High- compounds / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects
© EDP Sciences, 2002