Volume 102, Number 1, April 2013
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 April 2013|
Weak magnetic order in high-Tc superconductors produced by spontaneous Josephson currents
1 Department of Physics, Simon Fraser University - Burnaby, British Columbia, Canada V5A 1S6
2 Instituto de Física, Universidade Federal Fluminense - Niterói, RJ 24210-340, Brazil
Received: 2 January 2013
Accepted: 13 March 2013
We develop a model for high-Tc superconductors based on an electronic phase separation where low-and high-density domains are formed. At low temperatures this system may act as a granular superconductor forming an array of Josephson junctions. Cuprates are also known to have low superfluid densities and strong correlation effects. Both characteristics activate a negative Josephson coupling due to frustration that leads to spontaneous currents responsible for the weak ferromagnetic order. This original approach reproduces the observed onset of spontaneous magnetic signal and its dependence on the doping level.
PACS: 74.20.Mn – Nonconventional mechanisms / 74.81.Fa – Josephson junction arrays and wire networks / 74.62.En – Effects of disorder
© EPLA, 2013
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.