Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Poster Session: Correlated Electrons 1

TT 17.1: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Investigation of magnetic ground state of CeCoSi by means of neutron scattering — •Stanislav Nikitin1, 2, Diego Franco3, Jae Hyeon Kwon1, Andreas Hoser4, Michael Koza5, Robert Bewley6, Christoph Geibel1, and Oliver Stockert11Max Planck Institute CPfS, Dresden, Germany — 2Technical University Dresden, Germany — 3Centro Atomico Bariloche and Instituto Balseiro, Bariloche, Argentina. — 4Helmholtz-Zentrum Berlin, Berlin, Germany — 5Institut Laue-Langevin, Grenoble, France — 6ISIS Neutron Source, Didcot, United Kingdom

Ce-based materials represent a rich playground for investigation of many exotic phenomena, such as heavy-fermion behavior, unconventional superconductivity, quantum criticality and so on. In this work, we explored magnetic properties of a metallic Ce-based antiferromagnet CeCoSi, which has an unusual TP phase diagram. Cerium moments order below TN = 8.8 K, however, a very moderate hydrostatic pressure of P ≈ 1.5 GPa, stabilizes a new pressure-induced-ordered phase with significantly higher transition temperature of Tc ≈ 40 K. Motivated by these observation, we explored magnetic structure and excitation spectra of CeCoSi by means of elastic and inelastic neutron scattering. We found that the cerium moments orders in a simple AFM structure with q = 0. Using the results of inelastic neutron scattering and specific heat measurements we resolved the Hamiltonian of crystalline electrical field. Furthermore, we discussed a possible influence of the hydrostatic pressure on the spectra of magnetic excitations

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