Capacitive detection of magnetostriction, dielectric constant, and magneto-caloric effects in pulsed magnetic fields

Abstract

We report on the development of a capacitance measuring system which allows measurements of capacitance in pulsed magnetic fields up to 61~T. By using this system, magnetic-field responses of various physical quantities such magnetostriction, magnetic-field-induced change in complex dielectric constant, and magneto-caloric effect can be investigated in pulsed-magnetic-field conditions. Here, we examine the validity of our system for investigations of these magnetic-field-induced phenomena in pulse magnets. For the magnetostriction measurement, magnetostriction of a specimen can be measured through a change in the capacitance between two aligned electrodes glued on the specimen and a dilatometer. We demonstrate a precise detection of valley polarization in semimetallic bismuth through a magnetostriction signal with a resolution better than 10${}^{-6}$ of the relative length change. For the magnetic-field-induced change in complex dielectric constant, we successfully observed clear dielectric anomalies accompanied by magnetic/magnetoelectric phase transitions in multiferroic Pb(TiO)Cu${}_4$(PO${}_4$)${}_4$. For the measurement of magneto-caloric effect, a magnetic-field-induced change in sample temperature was verified for Gd${}_3$Ga${}_5$O${}_{12}$ with a capacitance thermometer made of a non-magnetic ferroelectric compound KTa${}_{1-x}$Nb${}_x$O${}_3$ ($x$ = 0.02) whose capacitance is nearly field-independent. These results show that our capacitance measuring system is a promising tool to study various magnetic-field-induced phenomena which have been difficult to detect in pulsed magnetic fields.

10 pages, 5 figures, submitted to Review of Scientific Instruments

References in corpus (4)

• Transport Properties and Diamagnetism of Dirac Electrons in Bismuth
• High resolution magnetostriction measurements in pulsed magnetic fields using Fibre Bragg Gratings
• Mechanism of spin crossover in LaCoO3 resolved by shape magnetostriction in pulsed magnetic fields
• Landau spectrum and twin boundaries of bismuth in the extreme quantum limit

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