Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4
S. Weber, P. Lunkenheimer, R. Fichtl, J. Hemberger, V. Tsurkan, and A., Loidl
TL;DR
This study reveals that HgCr2S4 exhibits colossal magnetocapacitance and magnetoresistance linked to ferromagnetic correlations and ferroelectric order, highlighting its potential for multifunctional magnetic and electric applications.
Contribution
It provides the first detailed analysis of the dielectric, ferroelectric, and magnetotransport properties of HgCr2S4, demonstrating colossal effects and their correlation with magnetic states.
Findings
Dielectric constant strongly enhanced below 80 K.
Development of ferroelectric order below 70 K.
Colossal magnetocapacitance and magnetoresistance observed.
Abstract
We present a detailed study of the dielectric and charge transport properties of the antiferromagnetic cubic spinel HgCr2S4. Similar to the findings in ferromagnetic CdCr2S4, the dielectric constant of HgCr2S4 becomes strongly enhanced in the region below 60 - 80 K, which can be ascribed to polar relaxational dynamics triggered by the onset of ferromagnetic correlations. In addition, the observation of polarization hysteresis curves indicates the development of ferroelectric order below about 70 K. Moreover, our investigations in external magnetic fields up to 5 T reveal the simultaneous occurrence of magnetocapacitance and magnetoresistance of truly colossal magnitudes in this material.
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