Large nonlinear dielectric properties of artificial BaTiO[sub 3]/SrTiO[sub 3] superlattices

Kim, Juho; Kim, Youngnam; Kim, Young Sung; Lee, Jaichan; Kim, Leejun; Jung, Donggeun
May 2002
Applied Physics Letters;5/13/2002, Vol. 80 Issue 19, p3581
Academic Journal
BaTiO[sub 3](BTO)/SrTiO[sub 3](STO) artificial superlattices have been made on MgO (100) substrates. The periodicity of the BTO/STO layers in the superlattice was varied from one-unit cell to 125-unit cell thickness. The dielectric constant and its nonlinearity (or voltage tunability) showed similar behavior as the periodicity was varied. The voltage tunability of the superlattice increased with decreasing stacking periodicity of the BTO/STO within the critical thickness. Similarly, the lattice distortion, i.e., the ratio of the lattice parameter along surface normal to parallel, of the BTO and STO layers increased with decreasing the periodicity. Remarkable enhancement of the voltage tunability has been achieved. The superlattice exhibited large voltage tunability (94%, the highest value to date) at the periodicity of BTO[sub 2-unit cell]/STO[sub 2-unit cell] at which the maximum lattice distortion of each layer was obtained. This suggests that the nonlinear dielectric property of the superlattice is closely related with the lattice distortion of the individual layers. © 2002 American Institute of Physics.


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