Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 25: Correlated Electrons: Frustrated Magnets - Strong Spin-Orbit Coupling 1
TT 25.8: Vortrag
Dienstag, 21. März 2017, 11:30–11:45, HSZ 304
Magnetic ground state of the pyrochlore iridate Nd2Ir2O7 — •Hanjie Guo1, Clemens Ritter2, Kazuyuki Matsuhira3, Isao Watanabe4, Liu Hao Tjeng1, and Alexander Komarek1 — 1MPI CPfS, Dresden, Germany — 2ILL, Grenoble, France — 3Kyushu Institute of Technology, KitaKyushu, Japan — 4RIKEN, Wako, Japan
Pyrochlore iridates are of interest due to the interplay between the relatively large spin-orbit coupling and electron-electron correlations which may induce novel phases such as Weyl semimetals. One important task for understanding the properties of these compounds is the determination of the magnetic structure which is challenging due to the small size of Ir4+ moments and maybe also due to the neutron absorption from Ir atoms. Our µSR studies on Nd2Ir2O7 clearly show two transitions below about 30 and 9 K related to the Ir and Nd sublattices, respectively. The full magnetic structure including the Ir sublattice has been determined by means of powder neutron diffraction at the high flux D20 diffractometer at the ILL. Our magnetic structure refinement unravels a so-called all-in/all-out magnetic structure for both the Nd and the Ir sublattices. The ordered magnetic moments at 1.8 K amount to 0.34(1) µB/Ir4+ and 1.27(1) µB/Nd3+.
[1] H. Guo, C. Ritter and A. C. Komarek, Phys. Rev. B 94, 161102(R) (2016).