Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4

S. Weber; P. Lunkenheimer; R. Fichtl; J. Hemberger; V. Tsurkan; A. Loidl

doi:10.1103/PhysRevLett.96.157202

Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4

Strongly Correlated Electrons 2009-11-11 v1 Materials Science

Authors: S. Weber , P. Lunkenheimer , R. Fichtl , J. Hemberger , V. Tsurkan , A. Loidl

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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.

Keywords

magnetic field first-order transition magnetization transport measurements ferromagnetic-antiferromagnetic transition

Cite

@article{arxiv.cond-mat/0602126,
  title  = {Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4},
  author = {S. Weber and P. Lunkenheimer and R. Fichtl and J. Hemberger and V. Tsurkan and A. Loidl},
  journal= {arXiv preprint arXiv:cond-mat/0602126},
  year   = {2009}
}

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4 pages, 4 figures

Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4

Abstract

Keywords

Cite

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