Suppression of asymmetric differential resistance in non-Fermi liquid system YbCu_(5-x)Al_(x) (x = 1.3 - 1.75) in high magnetic fields

TL;DR

This study investigates the suppression of asymmetric differential resistance in a non-Fermi liquid YbCu_(5-x)Al_(x) system under high magnetic fields, revealing magnetic field effects on contact asymmetry linked to NFL properties.

Contribution

It demonstrates the suppression of contact asymmetry in YbCu_(5-x)Al_(x) due to magnetic fields, highlighting NFL behavior influence on electronic transport.

Findings

Asymmetry in dV/dI(V) characteristics is suppressed by magnetic fields.

Maximum at one voltage polarity is observed near 1.3 mV for x=1.5.

Behavior is connected with non-Fermi liquid properties of the compounds.

Abstract

The non-Fermi liquid system (NFL) YbCu_(5-x)Al_(x) (x = 1.3 - 1.75) has been investigated in hetero- as well as homo-contact arrangement in magnetic fields up to 22.5 T. The observed dV/dI(V) characteristics reveal asymmetry in hetero-contact arrangement and do not agree with the model of thermal contact heating, at least close to zero-bias voltage. In the case of a hetero-contact arrangement we have observed a maximum at only one voltage polarity at about 1.3 mV (for x = 1.5), which asymmetry is suppressed in an applied magnetic field. This behavior is connected with NFL properties of studied compounds.