2013/05/21 by Takahiro Fujiwara, Michiaki Matsukawa, Fujiwara, Takahiro +7
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1305.4708
5 pages,5 figures
arxiv created 2013/11/26 · arxiv updated 2013/11/27
We report on the anomalous magnetization reversal under hydrostatic pressure in the lightly electron-doped manganite compound (Ca1-xSrx)Mn0.95Sb0.05O3 with its fixed carrier content. In a weakly magnetic field cooled measurement, diamagnetic magnetization is observed for x≤ 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 is restored. We present a magnetic phase diagram as a function of Sr concentration, under both ambient and hydrostatic pressures. To understand better the thermodynamical properties of this system, we have measured the specific heat as a function of temperature under a field cooling of 100 Oe. Our data show no anomalies associated with the temperature dependent magnetization reversal, indicating the absence of a long-rang magnetic ordering. The ac magnetic susceptibility measurement points to the existence of magnetic frustration for the Sr substituted samples exhibiting diamagnetic behavior.