Anisotropic Magnetic Properties in Åkermanite Sr2MSi2O7 (M=Co, Mn) Crystals
Anisotropic Magnetic Properties in Åkermanite Sr2MSi2O7 (M=Co, Mn) Crystals
Mitsuru Akaki(Sophia University); Tomoya Tadokoro(Sophia University); Hideki Kuwahara(Sophia University); Takumi Kihara(The University of Tokyo); Masashi Tokunaga(The University of Tokyo)
62권 12호, 1812~1814쪽
초록
We have investigated the magnetic and the dielectric properties of °akermanite Sr2CoSi2O7 and Sr2MnSi2O7 single crystals. Sr2CoSi2O7 shows a canted antiferromagnetism with a large magnetic anisotropy at temperatures below 7 K. By applying a magnetic field along the [110] direction, an electric polarization emerges along the c axis at temperatures below the magnetic transition temperature. In high magnetic fields, the saturation magnetization becomes enhanced only when the electric polarization appears. In contrast, the magnetization of Sr2MnSi2O7 is isotropic at all temperatures, and its magnetic-field-induced electric polarization is very small. These results suggest that the electronic configuration of the transition-metal ion is of crucial importance for the appearance of electric polarization.
Abstract
We have investigated the magnetic and the dielectric properties of °akermanite Sr2CoSi2O7 and Sr2MnSi2O7 single crystals. Sr2CoSi2O7 shows a canted antiferromagnetism with a large magnetic anisotropy at temperatures below 7 K. By applying a magnetic field along the [110] direction, an electric polarization emerges along the c axis at temperatures below the magnetic transition temperature. In high magnetic fields, the saturation magnetization becomes enhanced only when the electric polarization appears. In contrast, the magnetization of Sr2MnSi2O7 is isotropic at all temperatures, and its magnetic-field-induced electric polarization is very small. These results suggest that the electronic configuration of the transition-metal ion is of crucial importance for the appearance of electric polarization.
- 발행기관:
- 한국물리학회
- 분류:
- 물리학