Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-08-04
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 11 figures
Scientific paper
The sulfur based Cr-spinels RCr2S4 with R = Cd and Hg exhibit the coexistence of ferromagnetic and ferroelectric properties together with a pronounced magnetocapacitive coupling. While in CdCr2S4 purely ferromagnetic order is established, in HgCr2S4 a bond-frustrated magnetic ground state is realized, which, however, easily can be driven towards a ferromagnetic configuration in weak magnetic fields. This paper shall review our recent investigation for both compounds. Besides the characterization of the magnetic properties, the complex dielectric permittivity was studied by means of broadband dielectric spectroscopy as well as measurements of polarization hysteresis and pyro-currents. The observed colossal magneto-capacitive effect at the magnetic transition seems to be driven by an enormous variation of the relaxation dynamics.
Fichtl R.
Hemberger Joachim
Loidl Alois
Lunkenheimer P.
Tsurkan Vladimir
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