Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Spin-dependent Transport Phenomena II
MA 11.1: Vortrag
Montag, 26. März 2012, 17:15–17:30, H 1012
Electronic and magnetic phase separation in semimetallic ferromagnet EuB6 — •Pintu Das1, Adham Amyan1, Jens Brandenburg1, Peng Xiong2, Stefan von Molnár2, Zachary Fisk3, and Jens Müller1 — 1Institute of Physics, Max von Laue Str. 1, J. W. Goethe University, 60438 Frankfurt (M), Germany — 2Department of Physics, Florida State University, Tallahassee, USA — 3Department of Physics, University of California, Irvine, USA
EuB6 is a semimetallic correlated electron system, which undergoes an interesting paramagnetic to ferromagnetic transition displaying two consecutive features (at ∼ 15.5 K and ∼ 12.5 K) in electrical transport, magnetic properties and specific heat. Although widely studied, this complex nature of the magnetic ordering and its interplay with the colossal magnetoresistance effect is far from being understood and is currently being actively investigated [1]. In this work, we have carried out fluctuation spectroscopy and non-linear electrical transport measurements in order to investigate the dynamical behaviour of charge carriers in the vicinity of the phase transitions and to understand the microscopic nature of the carrier transport properties. Our results indicate that a magnetically driven percolation occurs at the lower transition temperature which is consistent with the scenario in which the magnetic phase transition involves the formation of magnetic polarons.
[1] X. Zhang et al., Phys. Rev. Lett. 103, 106602 (2009).