Journal article
Effect of chemical pressure on the electronic phase transition in Ca 1-x Sr x Mn 7 O 12 films
APL materials, Vol.5(9)
18 Sep 2017
Abstract
Here, we demonstrate how chemical pressure affects the structural and electronic phase transitions of the quadruple perovskite CaMn7O12 by Sr doping, a compound that exhibits a charge-ordering transition above room temperature making it a candidate for oxide electronics. We also have synthesized Ca1-xSrxMn7O12 (0 ≤ x ≤ 0.6) thin films by oxide molecular beam epitaxy on (LaAlO3)0.3(SrAl0.5Ta0.5O3)0.7 (LSAT) substrates. The substitution of Sr for Ca results in a linear expansion of the lattice, as revealed by X-ray diffraction. Temperature-dependent resistivity and X-ray diffraction measurements are used to demonstrate that the coupled charge-ordering and structural phase transitions can be tuned with Sr doping. An increase in Sr concentration acts to decrease the phase transition temperature (T*) from 426 K at x = 0 to 385 K at x = 0.6. Furthemore, the presence of a tunable electronic phase transition, above room temperature, points to the potential applicability of Ca1-xSrxMn7O12 in sensors or oxide electronics, for example, via charge doping.
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Details
- Title
- Effect of chemical pressure on the electronic phase transition in Ca 1-x Sr x Mn 7 O 12 films
- Creators
- A. Huon - Drexel Univ., Philadelphia, PA (United States). Dept. of Materials Science and EngineeringD. Lee - Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division] (ORCID:0000000347005047A. Herklotz - Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division] (ORCID:000000021545131XM. R. FitzsimmonsH. N. Lee - Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division] (ORCID:0000000221803975S. J. May - Drexel University
- Publication Details
- APL materials, Vol.5(9)
- Publisher
- American Institute of Physics (AIP)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Identifiers
- 991021934208504721