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

Abstract

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.

References in corpus (6)

• Spontaneous time reversal symmetry breaking in the pseudogap state of high-Tc superconductors
• MgB2 superconductor thin films on Si and Al2O3 substrates
• The pair-breaking critical current density of magnesium diboride
• Spontaneous magnetization and Hall effect in superconductors with broken time-reversal symmetry
• Reciprocity theorem in high-temperature superconductors
• Transverse voltage in high-Tc superconductors in zero magnetic fields

Cited by in corpus (2)

• Inhomogeneity and transverse voltage in superconductors
• Interplay of flux guiding and Hall effect in Nb films with nanogrooves