Transverse voltage in zero external magnetic fields, its scaling and violation of the time reversal symmetry in MgB2

Details Transverse voltage in zero external magnetic fields, its scaling and violation of the time reversal symmetry in MgB2 Transverse voltage in zero external magnetic fields, its scaling and violation of the time reversal symmetry in MgB2

2003-10-07

arxiv.org/abs/cond-mat/0310136v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/j.physc.2004.07.011

The longitudinal and transverse voltages (resistances) have been measured for MgB$_2$ in zero external magnetic fields. Samples were prepared in the form of thin film and patterned into the usual Hall bar shape. In close vicinity of the critical temperature T$_c$ non-zero transverse resistance has been observed. Its dependence on the transport current has been also studied. New scaling between transverse and longitudinal resistivities has been observed in the form $\rho{_{xy}}\sim d\rho{_{xx}}/dT$. Several models for explanation of the observed transverse resistances and breaking of reciprocity theorem are discussed. One of the most promising explanation is based on the idea of time-reversal symmetry violation.

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