Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Correlated Electrons: Frustrated Magnets - General 2
TT 72.2: Vortrag
Donnerstag, 23. März 2017, 15:15–15:30, HSZ 204
Magnetic properties of A2TaCl6 with 5d1 electons on FCC lattice — •Hajime Ishikawa1, Tomohiro Takayama2, Robert Dinnebier2, and Hidenori Takagi2 — 1University of Stuttgart, Stuttgart, Germany — 2Max Planck Institute for Solid State Research, Stuttgart, Germany
5d transition metal compounds are expected to show exotic magnetism as a result of the interplay between electronic correlation and strong spin-orbit coupling. In the case of 5d1 electronic configuration, the electron is considered to occupy the Jeff = 3/2 states, where effective orbital angular momentum Leff = 1 and spin angular momentum S = 1/2 cancel with each other. In recent theoretical studies, rich ground states are predicted in the system where localized electrons in Jeff = 3/2 states are arranged on the face centered cubic (FCC) lattice. Experimentally, several double perovskite oxides with FCC lattice have been studied as a model compound, however, their spin and orbital states are still unclear and under debate. The FCC lattice made of transition metal ions are also found in a series of halides with the chemical formula A2MX6. In this study, we studied physical properties of A2TaCl6 with 5d1 electronic configuration and their related materials by means of magnetization and heat capacity measurements and low-temperature X-ray diffraction experiments. Based on the results, we discuss the spin-orbital state of Ta4+ ion and difference between oxides and halides.