Takahiro Fujiwara, Michiaki Matsukawa, Satoru Kobayashi Shigeki Nimori, Ramanathan Suryanarayanan
We report here on the $dc$ magnetization as a function of temperature and pressure up to 1 GPa in the lightly electron-doped manganite compound (Ca$_{1-x}$Sr$_{x}$)Mn$_{0.95}$Sb$_{0.05}$O$_{3}$ with its fixed carrier content. When the magnetic field is small ($<$500 Oe), diamagnetic magnetization is observed for $x\leq 15%$, which changes to positive values for $x>15%$. However, on an application of pressure on the samples with $x=16%$ and 17$%$, magnetization reverses sign and diamagnetism reappears. We present a magnetic phase diagram as a function of temperature and pressure. To understand better the dynamical properties of this system, we have carried out the $ac$ magnetic susceptibility as a function of frequency in the presence of an external $dc$ field of 0 and 100 Oe. Our results indicate the existence of magnetic frustration between diamagnetic clusters and canted antiferromagnetic matrix.
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http://arxiv.org/abs/1305.4708
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