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Kondo physics in a rare earth Ion with well localized 4f electrons

AuthorsStankiewicz, Jolanta; Fisk, Zachary; Evangelisti, Marco
Issue Date2012
CitationAPS March Meeting 2012
AbstractWe observe a rise in the low temperature resistivity of dilute La1−xNdxB6 single crystals. The specific heat data for the same samples show that there is an entropy of Rln4 per mole Nd involved in the excess specific heat above that of LaB6. All these features are consistent with a Kondo scale of TK = 1 K. However, Nd has a well localized 4f 3 J = 9/2 Hund’s Rule configuration which is not expected to be Kondo coupled to the conduction electrons in LaB6. We conjecture that the unexpected Kondo effect arises via participation of 4f quadrupolar degrees of freedom of the Nd crystal field ground state quartet. Raman experiments as well as detailed theoretical studies do indicate that one expects strong quadrupolar influence in the properties of NdB6.
DescriptionResumen del trabajo presentado al American Physical Society March Meeting celebrado en Boston (US) del 27 de febrero al 2 de marzo de 2012.
Publisher version (URL)http://meetings.aps.org/link/BAPS.2012.MAR.T16.5
Appears in Collections:(ICMA) Comunicaciones congresos
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