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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.10: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Dilatometry in very high magnetic fields ... an overview — •Mathias Doerr¹, Sergey Granovsky¹, Martin Rotter^1,2, Thomas Stöter¹, Sergey Zherlitsyn³, and Zhaosheng Wang³ — ¹Technische Universität Dresden, Institut für Festkörperphysik, D-01062 Dresden, Germany — ²McPhase-project (www.mcphase.de) Dresden, Germany — ³Helmholtz-Zentrum Dresden-Rossendorf, Hochfeld-Magnetlabor (HLD-EMFL), PF 510119, D-01314 Dresden, Germany

Investigations of the changes in lattice constants or crystal symmetries of solids complement macroscopic measurements of electronic properties and often accompany ultrasound experiments. We give an overview on how the dilatometric methods have been developed in the last decade. The capacitive dilatometry can be used in steady fields with a resolution better than 10⁻⁸. Especially for the highest available (pulsed) fields of about 100 T, optical methods, such as for example the FBG (fibre bragg grating) technology, were developed with a resolution better than 10⁻⁶. Modern dilatometer constructions with a diameter of 5 mm allow to measure longitudinal and transversal components of the general striction tensor. Additionally, techniques to measure magnetostriction under pressure up to the highest fields are tested by scientific groups now. New results (GdSb, CeCu₂Ge₂, Ho₂Ti₂O₇ etc.) are discussed. The data are important to determine magnetic phase diagrams or show how lattice distortions influence the high-field properties of solids.