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Title: Effect of chemical pressure on the electronic phase transition in Ca 1-x Sr x Mn 7 O 12 films

Abstract

Here, we demonstrate how chemical pressure affects the structural and electronic phase transitions of the quadruple perovskite CaMn 7O 12 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 Ca 1-xSr xMn 7O 12 (0 ≤ x ≤ 0.6) thin films by oxide molecular beam epitaxy on (LaAlO 3) 0.3(SrAl 0.5Ta 0.5O 3) 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 Ca 1-xSr xMn 7O 12 in sensors or oxide electronics, for example, via charge doping.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2];  [1]
  1. Drexel Univ., Philadelphia, PA (United States). Dept. of Materials Science and Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1407986
Alternate Identifier(s):
OSTI ID: 1392139
Grant/Contract Number:  
[AC05-00OR22725; SC0014664]
Resource Type:
Accepted Manuscript
Journal Name:
APL Materials
Additional Journal Information:
[ Journal Volume: 5; Journal Issue: 9]; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Huon, A., Lee, D., Herklotz, A., Fitzsimmons, M. R., Lee, H. N., and May, S. J. Effect of chemical pressure on the electronic phase transition in Ca 1-x Sr x Mn 7 O 12 films. United States: N. p., 2017. Web. doi:10.1063/1.4994089.
Huon, A., Lee, D., Herklotz, A., Fitzsimmons, M. R., Lee, H. N., & May, S. J. Effect of chemical pressure on the electronic phase transition in Ca 1-x Sr x Mn 7 O 12 films. United States. doi:10.1063/1.4994089.
Huon, A., Lee, D., Herklotz, A., Fitzsimmons, M. R., Lee, H. N., and May, S. J. Mon . "Effect of chemical pressure on the electronic phase transition in Ca 1-x Sr x Mn 7 O 12 films". United States. doi:10.1063/1.4994089. https://www.osti.gov/servlets/purl/1407986.
@article{osti_1407986,
title = {Effect of chemical pressure on the electronic phase transition in Ca 1-x Sr x Mn 7 O 12 films},
author = {Huon, A. and Lee, D. and Herklotz, A. and Fitzsimmons, M. R. and Lee, H. N. and May, S. J.},
abstractNote = {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.},
doi = {10.1063/1.4994089},
journal = {APL Materials},
number = [9],
volume = [5],
place = {United States},
year = {2017},
month = {9}
}

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