Berlin 2015 – wissenschaftliches Programm
TT 67.9: Vortrag
Mittwoch, 18. März 2015, 17:15–17:30, H 3005
Ambient pressure superconductivity emerging in the antiferromagnetic phases of the novel heavy fermion compounds Ce3PdIn11 and Ce3PtIn11 — •Marie Kratochvílová, Jan Prokleška, Klára Uhlířová, Vladimír Sechovský, and Jeroen Custers — Department of Condensed Matter Physics, Charles University, Prague, Ke Karlovu 5, 121 16, Czech Republic
CenTmIn3n+2m (n=1,2; m=1; T=transition metal) heavy fermion compounds are known to be on the verge of a magnetic to non-magnetic quantum critical point (QCP). In close vicinity of the QCP they exhibit an unconventional superconducting state. However, this family of compounds is interesting for an other reason. The compounds crystallize in the tetragonal structures which provide the possibility to tune the structural dimensionality from more 2D to 3D (stoichiometries: 115-218-103). This makes them ideal candidates to investigate the influence of the parameter dimensionality with respect to quantum criticality.
Ce3TIn11 (T=Pd,Pt) single crystals were prepared for the first time. Ce3PtIn11 (Ce3PdIn11) exhibits two successive transitions at T1=2.2K (T1=1.7K) and TN=2.0K (TN =1.5K) into incommensurate and commensurate local moment antiferromagnetic states, respectively. Applying magnetic field along the c-axis gradually suppresses both transitions; they merge at 4T and split again in higher fields. Superconductivity emerges at TC=0.32K (TC=0.39K) and it is enhanced by the application of hydrostatic pressure. The unusual magnetic phase diagram will be discussed in the context of superconductivity and magnetism in related compounds.