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Breakdown of the coherence effects and Fermi liquid behavior in YbAl3 nanoparticles
C Echevarria-Bonet1,2, D P Rojas3, J I Espeso2
1BCMaterials, Bld. Martina Casiano, UPV/EHU Science Park, 48940 Leioa, Spain.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 21, 2018
Summary
Reducing Ytterbium Aluminum (YbAl3) to nanoparticles disrupts its Kondo lattice behavior, inhibiting coherence and deviating from standard Fermi liquid physics due to disrupted ion periodicity and quantum interference.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Ytterbium Aluminum (YbAl3) exhibits unique Kondo lattice behavior in bulk form.
- Understanding material properties at the nanoscale is crucial for developing new technologies.
Purpose of the Study:
- To investigate the influence of size reduction on the Kondo lattice behavior of YbAl3.
- To analyze changes in electrical resistivity and electronic scattering in YbAl3 nanoparticles.
Main Methods:
- Synthesis of YbAl3 nanoparticles (approximately 12 nm).
- Electrical resistivity measurements at low temperatures.
- Analysis of deviations from Fermi liquid theory and Kondo coherence effects.
Main Results:
- Observed inhibition of coherence effects in YbAl3 nanoparticles.
- Deviation from the expected T^2-dependence of resistivity, indicating a departure from Fermi liquid behavior.
- Identification of an additional electronic scattering source around 15 K due to quantum interference in the nanoparticle ensemble.
Conclusions:
- Nanoparticle formation disrupts the periodic array of Kondo ions, altering bulk YbAl3 properties.
- Size reduction leads to a breakdown of standard Kondo lattice behavior and Fermi liquid characteristics.
- Quantum interference effects in randomly placed nanoparticles introduce novel low-temperature scattering mechanisms.
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