Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 2.6: Talk

Monday, March 16, 2020, 10:45–11:00, HSZ 103

Transport measurements on microstructured samples of neodymium doped CeCoIn₅ — •J. Stirnat^1,2, S. Hamann^1,3, M. Winter^1,2, M. König³, L. Bischoff⁴, C. Petrovic⁵, T. Helm^1,3, and J. Wosnitza^1,2 — ¹Hochfeld-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.