Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 60: Magnetic Materials: Applications and Multielement Bulk Materials
MA 60.7: Vortrag
Freitag, 24. März 2017, 11:00–11:15, HSZ 101
Thermal expansion and magnetostriction of single-crystalline LiFePO4 — •Sven Krippendorf, Christoph Neef, Anna Pollithy, Norbert König, and Rüdiger Klingeler — Kirchhoff Institute of Physics, Heidelberg University, Germany
We report thermal expansion and magnetostriction studies in magnetic fields up to 17 T on LiFePO4 single crystals grown by the optical floating zone method. The onset of long range antiferromagnetic order at TN = 50.1(5) K is associated with pronounced λ-like anomalies of the thermal expansion coefficient α. In addition, there is an extended regime of fluctuations up to ≥ 80 K. We observe an additional anomaly in the linear thermal expansion coefficient of the crystalline b- and c-axis well below TN which field dependence is studied in detail. Grüneisen analysis reveals it as a new phenomenon which is not of purely magnetic origin and that has not been reported in the literature so far.