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MA: Fachverband Magnetismus

MA 5: Cooperative Phenomena and Phase Transitions (joint session MA/TT)

MA 5.10: Vortrag

Montag, 16. März 2020, 11:45–12:00, HSZ 401

Ferrimagnetism in CeSb₂: Measuring bulk magnetic properties with an STM — •Christopher Trainer¹, Paul Canfield², and Peter Wahl¹ — ¹University of St Andrews, School of Physics and Astronomy, St Andrews, Fife, UK — ²Iowa state University, Department of Physics and Astronomy, Ames, Iowa, US

CeSb₂ is one of a family of rare earth magnetic materials that exhibit metamagnetism where the magnetic state can be changed by an applied magnetic field. At low temperature it exhibits a complex phase diagram with multiple magnetically ordered phases for many of which the order parameter is only poorly understood. In this talk I will report Scanning Tunneling Microscopy and magnetization measurements of CeSb₂. I introduce a new mode of STM measurements which allows for the characterization of the sample magnetostriction and thus the construction of a bulk phase diagram using an STM. From the magnetostriction measurement, we determine the bulk phase diagram and validate it by comparison with magnetization measurements. Our magnetostriction and magnetisation measurements indicate the low temperature ground state at zero field is ferrimagnetic. Quasiparticle interference mapping showing how the electronic behaviour develops through the phase diagram will also be discussed.