File Name : fig s1.tif

Caption : fig. s1 the lattice strain as a function of cr<sup>3+</sup> doping content <i>x</i>.

File Name : fig s2.tif

Caption : fig. s2 temperature dependence of dc magnetization under zfc and fc conditions with a magnetic field of 100 oe for the <i>x</i>=0.1 sample. the inset shows derivative d<i>m</i>/d<i>t</i> vs <i>t</i> of the fc data.