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Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.109: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

Pyrochlore Iridates: Possible Candidates for the Realization of Weyl Nodes — •Andreas Wörfel1, Matthias Opel1, Stephan Geprägs1, and Rudolf Gross1,21Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 2Physik-Department, Technische Universität München, 85748 Garching, Germany

Pyrochlore iridates A2Ir2O7 (A=Y or a rare-earth ion) offer a promising system for studying the interplay of strong spin-orbit coupling, electronic correlations, and band topology effects. Novel phases such as axial or topological insulators, and Weyl semimetals have been predicted in these compounds [1]. In particular, Nd2Ir2O7 is proposed to exhibit Weyl semimetal nodes, where two non-degenerate bands touch each other creating a local linear dispersion. These nodes are topologically protected making Weyl states absolutely robust to perturbations.

Here, we report on a detailed study of the structural, magnetic, and magnetotransport properties of bulk samples as well as thin films of Nd2Ir2O7. Epitaxial Nd2Ir2O7 thin films were deposited on single-crystalline Y:ZrO2 (111) substrates using laser-MBE, whereas polycrystalline bulk Nd2Ir2O7 samples were fabricated by a standard solid state reaction. These samples show a metal to insulator transition (MIT) at around TMIT≃33 K. The MIT is accompanied by a bifurcation of the magnetic susceptibility in field-cooled (FC) and zero-field-cooled (ZFC) conditions, suggesting the existence of a magnetic long-range ordered state for temperatures T<TMIT.

[1] X. Wan et al., Phys. Rev. B 83, 205101 (2011).

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