Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.8: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Field-induced Quantum Critical Point in the heavy-fermion superconductor Ce₂PdIn₈ — •Jinkui Dong^1,2, Yoshi Tokiwa¹, Philipp Gegenwart¹, Shiyan Li², Daniel Gnida³, and Dariusz Kaczorowski³ — ¹I. Physikalisches Institut, Georg-August-Universität Goettingen, 37077 Goettingen, Germany — ²Department of Physics, State Key Laboratory of Surface Physics, and Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China — ³Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroclaw, Poland

The in-plane resistivity ρ, specific heat C and thermal conductivity κ of the heavy-fermion superconductor Ce₂PdIn₈ single crystals were measured down to 50 mK. A field-induced quantum critical point, occurring at the upper critical field H_c2, is demonstrated from the ρ(T)∼ T near H_c2 and ρ(T)∼ T² when further increasing the field. In specific heat measurements, the normal-state electronic specific-heat coefficient displays logarithmically divergent behavior, comparable to CeCoIn₅ and in agreement with 2D quantum criticality of spin-density-wave type. The large residual linear term κ₀/T at zero field and the rapid increase of κ(H)/T at low field give evidence for nodal superconductivity in Ce₂PdIn₈. The jump of κ(H)/T near H_c2 suggests a first-order-like phase transition at low temperature. These results mimic the features of the famous CeCoIn₅ superconductor, implying that Ce₂PdIn₈ may be another interesting compound to investigate for the interplay between magnetism and superconductivity.