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Two-channel Kondo effect in glasslike ThAsSe
T Cichorek1, A Sanchez, P Gegenwart
1Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.
Physical Review Letters
|August 11, 2005
Summary
This study reveals unusual electron scattering and glass-like thermal properties in ThAsSe, suggesting a two-channel Kondo effect from structural two-level systems.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Understanding low-temperature properties of novel materials is crucial for discovering new quantum phenomena.
- ThAsSe single crystals present an unexplored system for investigating charge and heat transport mechanisms.
Purpose of the Study:
- To investigate the low-temperature heat and charge transport properties of ThAsSe single crystals.
- To explore the caloric properties and identify underlying physical mechanisms.
- To determine if ThAsSe exhibits characteristics of a two-channel Kondo effect.
Main Methods:
- Low-temperature electrical resistivity measurements up to 14 Tesla.
- Low-temperature thermal conductivity measurements.
- Specific heat capacity measurements.
- Analysis of temperature-dependent transport and caloric data.
Main Results:
- An anomalous -AT(1/2) term in electrical resistivity, independent of magnetic field, indicating unusual electron scattering.
- Glass-type temperature dependence observed in both thermal conductivity and specific heat.
- Evidence for the presence of tunneling states within the material structure.
Conclusions:
- The observed phenomena in ThAsSe single crystals suggest an experimental realization of the two-channel Kondo effect.
- The Kondo effect appears to be derived from structural two-level systems.
- These findings open new avenues for exploring quantum effects in complex materials.
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