Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 52: Quantum Impurities and Kondo Physics
TT 52.5: Vortrag
Donnerstag, 4. April 2019, 10:30–10:45, H7
Exploring Kondo lattices with inequivalent Ce-sites — Jiří Pospíšil, Jiří Prchal, and •Jeroen Custers — Dept. of Condensed Matter Physics, Charles University, Ke Karlovu, 5, 121 16 Praha, Czech Republic
Strongly correlated electron systems with competing interactions provide a fertile ground for discovering exotic states of matter. As a particularly interesting setting we study heavy fermion (HF) systems with two crystallographically inequivalent local moment sites. These may lead to the formation of two Kondo sublattices with largely different Kondo temperatures. We expect such systems to show better tunability towards various kinds of quantum phase transitions than single-site Kondo systems, and to form novel phases. Here we present recent results on selected compounds, like Ce3Al11 [1], Ce3PtIn11 [2,3] and other. Ce3PtIn11 is highly interesting as it shows coexistence of antiferromagnetism (TN = 2 K) and superconductivity (Tc = 0.32 K). From entropy analysis it has been speculated that in this compound the CeI (2 ions) remains paramagnetic and at lower T evokes superconductivity while the CeII site is responsible for the magnetic ordering. Furthermore we will discuss several pressing questions: Do the two Kondo scales compete or cooperate? Can the interplay lead to Kondo breakdown, partially screened phases, or even fractionalized Fermi liquids?
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