Dresden 2011 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.11: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

²⁷Al NMR/NQR study on RRu₂Al₁₀ (R: La, Ce) and RFe₂Al₁₀ (R: Y, Yb). — •Panchanana Khuntia¹, Michael Baenitz¹, Rajib Sarkar¹, André Strydom², and Frank Steglich¹ — ¹Max-Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany — ²Physics Department APK, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa

Ternary orthorhombic aluminides of RT₂Al₁₀ type (R:Ce, Yb, T: Fe, Ru, Os) are currently attracting much interest because of a number of exotic properties such as anomalously high magnetic ordering temperatures in CeRu₂Al₁₀ [1] and CeOs₂Al₁₀, and strongly hybridized Kondo insulating state in CeFe₂Al₁₀. The Fe-Al systems are of special interest because YFe₂Al₁₀ is claimed being located close to a Fe-based ferromagnetic instability at very low temperature [2]. Here pronounced non Fermi liquid (NFL) phenomena are observed. For YbRh₂Si₂ this NFL behaviour is associated to strong ferromagnetic fluctuations (see ²⁹Si NMR in [3]). Our spin relaxation study on YFe₂Al₁₀ gives strong evidence for Fe based ferromagnetic fluctuations evolving towards low temperature in small fields. YbFe₂Al₁₀ is a weak Kondo coupled heavy fermion system where no traces of Fe-magnetism could be found [2].
Physica B, 404(2009)2981
Phys. Stat. Solidi 4, No. 12, 356-358(2010)
PRL 89, 107202(2010)