Phenomenology of two channel Kondo alloys and compounds

✍ Scribed by D.L. Cox; M. Makivic

• Book ID: 103940705
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 455 KB
• Volume: 199-200
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91848-1

✦ Synopsis

We report realistic calculations of magnetic response and transport coefficients for a model U 4÷ ion in a metal which undergoes the quadrupolar Kondo effect. We find a small critical regime for the ~ term in the resistivity p(T). The magnitude and sign of the ~ term are argued to be nonuniversa! for finite crystal field splitting. Related ,~ terms are found in the van Vleck susceptibility which may be observed in UBe13. The thermopower S(T) and p(T} show characteristic crystal field related peaks. S(T) undergoes a low-temperature sign change when the dominant fluctuation weight is to the excited f"+ ~ configuration from a stablef" configuration; this may help explain data for UBet3 and CeCu2Si2. Considering the two-channel lattice in a particular infinite dimension limit, we argue that p( T ---0) ,~ 0 in the absence of symmetry breaking. This may explain the reproducibly large residual resistivity of UBe~ 3-