Remarkable effects of dopant valency $-$ a comparative study of CaBaCo$_{3.96}$Cr$_{0.04}$O$_7$ and CaBaCo$_{3.96}$Ni$_{0.04}$O$_7$

M. Islam; S. Adhikari; S. Pramanick; S. Chatterjee; A. Karmakar

doi:10.1016/j.jmmm.2021.167847

paper

Remarkable effects of dopant valency $-$ a comparative study of CaBaCo $_{3.96}$ Cr $_{0.04}$ O $_{7}$ and CaBaCo $_{3.96}$ Ni $_{0.04}$ O $_{7}$

arXiv:2007.07722 · doi:10.1016/j.jmmm.2021.167847

Abstract

Distinctive effects of dopant valency is discussed using an impurity level 1% doping each of Cr $^{3 +}$ and Ni $^{2 +}$ in CaBaCo $_{4}$ O $_{7}$ . Through a comparative study of the magnetic and dielectric properties of multiferroic CaBaCo $_{3.96}$ Cr $_{0.04}$ O $_{7}$ and CaBaCo $_{3.96}$ Ni $_{0.04}$ O $_{7}$ , we highlight that Cr doping does not significantly alter the properties in spite of differences in magnetic spin and ionic radius compared to Co $^{3 +}$ and Co $^{2 +}$ while Ni doping induces spectacular changes. Particularly, a manifold increase of electric polarization change up to 650 $μ$ C/m $^{2}$ at 5.6 kV/cm is observed in CaBaCo $_{3.96}$ Ni $_{0.04}$ O $_{7}$ compared to CaBaCo $_{3.96}$ Cr $_{0.04}$ O $_{7}$ and a stronger magnetoelectric coupling leading to a polarization change of $\sim$ 12% in 15 T magnetic field and below 40 K. Further, magnetodielectric effects hint to competing magnetic phases over the temperature range of magnetic transitions. We discuss the observed disparity in the light of a possible site selective doping of Cr $^{3 +}$ and Ni $^{2 +}$ in the triangular and kagomé layers, respectively, of the parent compound.

arXiv comment7 pages, 4 figures, 3 tables

Remarkable effects of dopant valency − a comparative study of CaBaCo3.96​Cr0.04​O7​ and CaBaCo3.96​Ni0.04​O7​

Abstract

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Remarkable effects of dopant valency $-$ a comparative study of CaBaCo $_{3.96}$ Cr $_{0.04}$ O $_{7}$ and CaBaCo $_{3.96}$ Ni $_{0.04}$ O $_{7}$