| Issue |
Europhys. Lett.
Volume 57, Number 3, February 2002
|
|
|---|---|---|
| Page(s) | 444 - 450 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00480-8 | |
| Published online | 01 September 2002 | |
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: dovratb@post.tau.ac.il
Received:
8
May
2001
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
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