Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.29: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Influence of Negative Charge Carrier Doping in Nd2Ir2O7 on Structure and Magnetic Behavior — •Sebastian Selter1, Ameya Prabhune1, Anja U. B. Wolter1, Saicharan Aswartham1, and Bernd Buechner1,2 — 1IFW Dresden, Dresden, Germany — 2TU Dresden, Dresden, Germany
We present the influence of negative charge doping on the structure and magnetic behavior of rare earth iridate pyrochlore (Nd1−xCax)2Ir2O7 and Nd2(Ir1−xGax)2O7 with x = 0..0.2.
Nd2Ir2O7 possesses a hyperkagome lattice of corner-shared IrO6 and edge-shared NdO8 units. This gives rise to magnetic frustration and an all-in-all-out (AIAO) ordering is observed at low temperatures. Further, this material undergoes a metal-to-insulator transition (MIT) at around 30 K. MIT is a phenomenon observed in all rare earth iridate pyrochlores, except for Pr2Ir2O7 which is metallic down to lowest temperatures. However, Nd2Ir2O7 shows the lowest MIT temperature compared to other rare earth iridate pyrochlores and therefore is nearest to a possible quantum MIT. Furthermore, band structure calculations suggest that a Weyl semimetallic state with broken time reversal symmetry may be stabilized by the AIAO order in Nd2Ir2O7. Recently, a dependency of the magnetic behavior and the MIT on the oxygen position in the rare earth iridate pyrochlores was proposed from theoretical side. A strong coupling of the physical properties to the crystal structure in Nd2Ir2O7 can be concluded.