Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure

TT 2.6: Vortrag

Montag, 16. März 2020, 10:45–11:00, HSZ 103

Transport measurements on microstructured samples of neodymium doped CeCoIn5 — •J. Stirnat1,2, S. Hamann1,3, M. Winter1,2, M. König3, L. Bischoff4, C. Petrovic5, T. Helm1,3, and J. Wosnitza1,21Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Technische Universität Dresden (TUD), Germany — 3Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS), Dresden, Germany — 4Ionenstrahlzentrum (IBC), HZDR, Dresden, Germany — 5Brookhaven National Laboratory, Upton, USA

CeCoIn5 is known to host d-wave heavy-fermion superconductivity and also a high-field superconducting phase, the Q phase. In neodymium the 4f-electrons do not hybridize with the conduction electrons. Therefore, substituting a certain amount of the cerium atoms in CeCoIn5 with neodymium, spin density waves and antiferromagnetic order can be induced. Previous de Haas-van Alphen measurements show that with increasing Nd doping the Fermi surfaces of CeCoIn5 are reconstructed from a quasi-two-dimensional to a three-dimensional topology. Such a dramatic change may also be reflected by the electrical transport anisotropy. In order to gain access to different conduction-channel directions, we fabricated micrustructures of Nd-doped CeCoIn5 using focused ion beam (FIB) microfabrication. Our goal is to study the effect of Nd doping on the resistivity anisotropy in high magnetic fields. In this talk I will present first preliminary results in fields of up to 16 T and at 3He temperatures.

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