The Raman spectroscopy and AC and DC magnetization of Dy$_{ 2-x}$Eu$_x$Ti$_2$O$_7$ have been investigated. In Raman Spectroscopy, the systematic shift in all phonon modes with Eu content in Dy$_{ 2-x}$Eu$_x$Ti$_2$O$_7$ confirms that Dy$^{ 3+}$ ion is substituted by Eu3+ ions. High concentration of Eu induces the dipolar exchange interactions and crystal-field interactions in Dy$_{ 2-x}$Eu$_x$Ti$_2$O$_7$. Rich Eu content samples (x=1.8 and 1.9) show the existence of wasp-waisted hysteresis loop and that can be attributed to the coexistence of dipolar field and anisotropy exchange interaction. AC susceptibility shows two single ion spin freezing transitions corresponding to Dy$^{ 3+}$ and Eu$^{ 3+}$ ions respectively in x = 1.5, 1.8, 1.9 samples.
Categories: cond-mat.mtrl-sci cond-mat.str-el