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MA: Fachverband Magnetismus
MA 5: Spin Textures and magnetic Phase Transitions
MA 5.9: Talk
Monday, March 7, 2016, 12:15–12:30, H34
Magnetic order via long ranged RKKY interaction in frustrated pyrochlore magnets — •Sebastian Paeckel1 and Paul McClarty2 — 1Georg-August Universität - Institut für Theoretische Physik, Göttingen — 2Wandham college, University of Oxford
Recent experiments on Pr2Ir2O7, which is poised close to a metal-insulator transition, revealed confusing low-temperature behaviour e.g. a large anomalous hall effect accompanied with an unmeasurable small magnetization at T < 1K with no sign of long ranged magnetic order which led some authors to suggest Pr2Ir2O7 as a candidate for a metallic spin liquid[1,2]. Remarkably Pr2Ir2O7 is the only compound in the pyrochlore iridate series which exhibits metallic behaviour naturally leading to the question on how the itinerant character of the 5d Ir system influences the ordering behaviour of the geometrically frustrated localised Pr moments.
In my talk I'm going to present results of calculations of the magnetic phase diagram for a simplified model capturing the interplay between classical localised magnetic moments and itinerant S=1/2 fermions with both constituents placed on a pyrochlore lattice. Taking into consideration the full long ranged character of the induced RKKY interaction then permits to relate the emerging magnetic structures to the frustrated nature of the itinerant electronic system.
[1] S. Nakatsuji, Y. Machida, J. J. Ishikawa, S. Onoda & Y. Karaki, Journal of Physics: Conference Series 320 (2011) 012056
[2] S. Nakatsuji, Y. Machida, Y. Maeno, T. Tayama et al., PRL 96, 087204 (2006)