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Open Access Publications from the University of California

Scholarly Works (3 results)

  • Article
  • Peer Reviewed
UC Irvine Previously Published Works (2003)
YbAl3 is an intermediate valent compound with a large Kondo temperature T-K and moderately low conduction electron density. Because of this, YbAl3 is a prime candidate for the observation of effects caused by low conduction electron density, where coherence sets in below T-coh rather than T-K (T-coh much less than T-K). For the first time, we have directly observed the cross over between the energy scales by the application of a magnetic field above B* approximate to 40 T (approximate to k(B)T(coh)/mu(B)). We also observe a reduction in the effective masses above B* that is consistent with the energy scale crossover.
    Cover page: Slow crossover and observation of a second energy scale in YbAl3Creative Commons 'BY' version 4.0 license
    • Article
    LBL Publications (2003)
      Cover page: Investigation of Anderson lattice behavior in Yb1-xLuxAl3
      • Article
      Lawrence Berkeley National Laboratory (2002)

      We present results for YbAl$_3$ which show that the susceptibility $\chi(T)$, 4f occupation number $n_f(T)$ and the entropy $S(T)$ exhibit a slow crossover between the Fermi liquid and local moment regimes. In addition both $\chi(T)$ and the linear specific heat coefficient $\gamma = C/T$ exhibit low temperature peaks that imply that in addition to the Kondo scale ($T_K$ $\approx $ 500K) there is a second low temperature scale ($T_coh$ ^M$\approx $ 50K) for the onset of coherence. We discuss these results in the context of Nozieres' exhaustion in the Anderson lattice.

        Cover page: Two energy scales and slow crossover in YbAl3
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