On the room temperature multiferroic BiFeO3: Magnetic, dielectric and thermal properties (2009)
Lu, Jun, Günther, A., Schrettle, F., Mayr, F., Krohns, S., Lunkenheimer, P., ...
Magnetic dc susceptibility between 1.5 and 800 K, ac susceptibility and magnetization, thermodynamic properties, temperature dependence of radio and audio-wave dielectric constants and conductivity,...
Krohns, S., Lu, J., Lunkenheimer, P., Brize, V., Autret-Lambert, C., Gervais, M., ...
The present work reports synthesis, as well as a detailed and careful characterization of structural, magnetic, and dielectric properties of differently tempered undoped and doped CaCu3Ti4O12 (CCTO)...
Dielectric constant of Pr2/3Cu3Ti4O12: Colossal as in CaCu3Ti4O12 (2009)
Sebald, J., Krohns, S., Lunkenheimer, P., Ebbinghaus, S. G., Riegg, S., Reller, A., ...
In the present work we demonstrate that in the series Ln2/3Cu3Ti4O12 with Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm, the compounds Pr2/3Cu3Ti4O12 and La2/3Cu3Ti4O12 stand out by showing...
Colossal dielectric constant up to GHz at room temperature (2008)
Krohns, S., Lunkenheimer, P., Kant, Ch., Pronin, A. V., Brom, H. B., Nugroho, A. A., ...
The search for new materials with extremely high ("colossal") dielectric constants, required for future electronics, is one of the most active fields of modern materials science. However, the...
Colossal magnetocapacitive effect in differently synthesized and doped CdCr2S4 (2008)
Krohns, S., Schrettle, F., Lunkenheimer, P., Tsurkan, V., Loidl, A.
In the present work, we address the question of an impurity-related origin of the colossal magnetocapacitive effect in the spinel system CdCr2S4. We demonstrate that a strong variation in the...
Schrettle, F., Krohns, S., Lunkenheimer, P., Hemberger, J., Büttgen, N., ...
We present a detailed study of complex dielectric constant and ferroelectric polarization in multiferroic LiCuVO4 as function of temperature and external magnetic field. In zero external magnetic...
Krohns, S., Lunkenheimer, P., Ebbinghaus, S. G., Loidl, A.
In the present work the authors report results of broadband dielectric spectroscopy on various samples of CaCu3Ti4O12, including so far only rarely investigated single crystalline material. The...
Broadband dielectric response of CaCu3Ti4O12: From dc to the electronic transition regime (2007)
Kant, Ch., Rudolf, T., Mayr, F., Krohns, S., Lunkenheimer, P., Ebbinghaus, S. G., ...
We report on phonon properties and electronic transitions in CaCu3Ti4O12, a material which reveals a colossal dielectric constant at room temperature without any ferroelectric transition. The results...
Broadband dielectric spectroscopy on single-crystalline and ceramic CaCu3Ti4O12 (2006)
Krohns, S., Lunkenheimer, P., Ebbinghaus, S. G., Loidl, A.
We present dielectric measurements of the colossal dielectric constant material CaCu3Ti4O12 extending up to 1.3 GHz also covering so far only rarely investigated single crystalline samples. Special...