Two-Cannel Kondo Effect in Glass-Like ThAsSe

TL;DR

This paper reports on low-temperature measurements of ThAsSe revealing a two-channel Kondo effect caused by structural two-level systems, evidenced by unusual electron scattering and glass-like thermal properties.

Contribution

It provides experimental evidence of a two-channel Kondo effect in a structural two-level system material, linking electron scattering and glass-like thermal behavior.

Findings

Resistivity shows a -AT1/2 dependence unaffected by magnetic fields.

Thermal conductivity and specific heat exhibit glass-like temperature dependence.

Evidence suggests the presence of tunneling states related to the two-channel Kondo effect.

Abstract

We present low-temperature heat and charge transport as well as caloric properties of a ThAsSe single crystal. An extra -AT1/2 term in the electrical resistivity, independent of magnetic fields as high as 14 T, provides evidence for an unusual scattering of conduction electrons. Additionally, both the thermal conductivity and specific heat show a glass-type temperature dependence which signifies the presence of tunneling states. These observations apparently point to an experimantal realization of a two-channel Kondo effect derived from structural two-level systems.