Above-ordering-temperature large anomalous Hall effect in a triangular-lattice magnetic semiconductor
Masaki Uchida, Shin Sato, Hiroaki Ishizuka, Ryosuke Kurihara, Taro Nakajima, Yusuke Nakazawa, Mizuki Ohno, M. Kriener, Atsushi Miyake, Kazuki Ohishi, Toshiaki Morikawa, M. S. Bahramy, T. Arima, Masashi Tokunaga, Naoto Nagaosa, M. Kawasaki
Abstract
ions with large magnetic moments form distorted triangular lattice. In addition to colossal magnetoresistance, EuAs exhibits large AHE with an anomalous Hall angle of 0.13 at temperatures far above antiferromagnetic ordering. As also demonstrated by model calculations, observed AHE can be explained by the spin cluster scattering in a hopping regime. Our findings shed light on magnetic semiconductors hosting topological spin textures, developing a field targeting diluted carriers strongly coupled to noncoplanar spin structures.