Carrier density control of magnetism and Berry phases in doped EuTiO3
Abstract
In materials with broken time-reversal symmetry, the Berry curvature acts as a reciprocal space magnetic field on the conduction electrons and is a significant contribution to the magnetotransport properties, including the intrinsic anomalous Hall effect. Here, we report neutron diffraction, transport, and magnetization measurements of thin films of doped EuTiO3, an itinerant magnetic material, as a function of carrier density and magnetic field. These films are itinerant antiferromagnets at all doping concentrations. At low carrier densities, the magnetoresistance indicates a metamagnetic transition, which is absent at high carrier densities (>6 × 1020 cm−3). Strikingly, the crossover coincides with a sign change in the spontaneous Hall effects, indicating a sign change in the Berry curvature. We discuss the results in the context of the band structure topology and its coupling to the magnetic texture.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 01, 2018
- Source ID
- 10.1063/1.5025317
Entities
People
- Anderson Janotti
- Jeffrey W. Lynn
- Kaveh Ahadi
- Stephen D Wilson
- Susanne Stemmer
- Zach Porter
- Zhigang Gui
- Zhijun Xu
Organizations
- Army Research Office
- National Institute of Standards and Technology
- National Science Foundation
- University of Delaware
- University of Maryland