Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4

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.

4 pages, 4 figures

References in corpus (2)

• Relaxation dynamics and colossal magnetocapacitive effect in CdCr2S4
• Charge-Density-Wave like Behavior in the One-Dimensional Charge-Ordered Semiconductor (NbSe4)3I

Cited by in corpus (7)

• Electronic band structure and exchange coupling constants in ACr2X4 spinels
• Spin-phonon coupling in antiferromagnetic chromium spinels
• Spin-driven Phonon Splitting in Bond-frustrated ZnCr2S4
• Polar phonons and spin-phonon coupling in HgCr2S4 and CdCr2S4
• Experimental evidence for competition of antiferromagnetic and ferromagnetic correlations in HgCr2S4
• Symmetry constraints on the electrical polarization in novel multiferroic materials
• Colossal magnetocapacitive effect in differently synthesized and doped CdCr2S4