Electronic and magnetic properties of metallic quantum multiferroic EuTiO3-δ

POSTER

Abstract

EuTiO3 has drawn interest in recent years, as it exhibits paraelectricity similar to SrTiO3 and KTaO3. Moreover, this insulating perovskite is a candidate quantum multiferroic, as it exhibits antiferromagnetic (AFM) order below TN ~ 5.5 K; potential ferroelectric and magnetic quantum critical points might be reached by alloying and/or strain-tunning. Furthermore, prior theoretical and experimental studies of metallic EuTiO3 have shown that carrier-doping can tune the ground-state spin configuration from AFM to ferromagnetic (FM). Considering the possible connection between ferroelectricity and superconductivity proposed for SrTiO3, a search for superconductivity in metallic EuTiO3 is of considerable interest. Here, we present a novel annealing technique to introduce oxygen vacancies and, hence, metallicity in floating-zone-grown insulating EuTiO3. We leverage charge transport, magnetization, and x-ray diffuse scattering measurements to investigate the electronic properties of doped EuTiO3, specifically: the cross-over between AFM and FM ground states, searches for superconductivity and multiferroic quantum criticality.

* This work was supported by the US DOE through the University of Minnesota Center for Quantum Materials under DE-SC0016371.

Presenters

  • Xing He

    University of Minnesota

Authors

  • Xing He

    University of Minnesota

  • Richard J Spieker

    University of Minnesota

  • Chiou Yang Tan

    University of Minnesota, Twin Cities, University of Minnesota

  • Issam Khayr

    University of Minnesota, Twin Cities, University of Minnesota

  • Dinesh K Shukla

    UGC-DAE Consortium for Scientific Research, University of Minnesota, University of Minnesota, Twin Cities

  • Martin Greven

    University of Minnesota

  • Suchismita Sarker

    Cornell University, Cornell High Energy Synchrotron Source, CHESS