Long Range Ferromagnetic Order in LaCoO3-δ epitaxial films due to the interplay of epitaxial strain and oxygen vacancy ordering

Mehta, Virat; Biskup, Nevenko; Arenholz, E; Varela del Arco, Maria; Suzuki, Yuri

doi:10.1103/PhysRevB.91.144418

Title: Long Range Ferromagnetic Order in LaCoO_3-δ epitaxial films due to the interplay of epitaxial strain and oxygen vacancy ordering

Journal Article · Thu Apr 23 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.144418· OSTI ID:1222548

Mehta, Virat ^[1]; Biskup, Nevenko ^[2]; Arenholz, E ^[3]; Varela del Arco, Maria ^[2]; Suzuki, Yuri ^[4]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States);Univ. Complutense Madrid (Spain)
Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Stanford Univ., CA (United States)

We demonstrate that a combination of electronic structure modification and oxygen vacancy ordering can stabilize a long-range ferromagnetic ground state in epitaxial LaCoO₃ thin films. Highest saturation magnetization values are found in the thin films in tension on SrTiO₃ and (La,Sr)(Al,Ta)O₃ substrates and the lowest values are found in thin films in compression on LaAlO₃. Electron microscopy reveals oxygen vacancy ordering to varying degrees in all samples, although samples with the highest magnetization are the most defective. Element-specific x-ray absorption techniques reveal the presence of high spin Co²⁺ and Co³⁺ as well as low spin Co³⁺ in different proportions depending on the strain state. The interactions among the high spin Co ions and the oxygen vacancy superstructure are correlated with the stabilization of the long-range ferromagnetic order.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; DESC0008505

OSTI ID:: 1222548

Alternate ID(s):: OSTI ID: 1178590

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 14; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 67 works

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Oxygen vacancy formation, crystal structures, and magnetic properties of three SrMnO _3−δ films Wang, F.; Zhang, Y. Q.; Bai, Y. Applied Physics Letters, Vol. 109, Issue 5 https://doi.org/10.1063/1.4960463	journal	August 2016
Atomic-resolution in-situ cooling study of oxygen vacancy ordering in La _0.5 Sr _0.5 CoO _3−δ thin films Rui, Xue; Klie, Robert F. Applied Physics Letters, Vol. 114, Issue 23 https://doi.org/10.1063/1.5098886	journal	June 2019
Strain-induced high-temperature perovskite ferromagnetic insulator Meng, Dechao; Guo, Hongli; Cui, Zhangzhang Proceedings of the National Academy of Sciences, Vol. 115, Issue 12 https://doi.org/10.1073/pnas.1707817115	journal	March 2018
Topotactic transition between perovskite and brownmillerite phases for epitaxial LaCoO _{3− δ} films and effects thus resulted Huang, Hailin; Zhang, Jine; Zhang, Hui Journal of Physics D: Applied Physics, Vol. 53, Issue 15 https://doi.org/10.1088/1361-6463/ab6bef	journal	February 2020
Low-energy orbital excitations in strained ${LaCoO}_{3}$ films Wang, Ru-Pan; Geessinck, Jaap; Elnaggar, Hebatalla Physical Review B, Vol. 100, Issue 16 https://doi.org/10.1103/physrevb.100.165148	journal	October 2019
Ferromagnetism and Charge Order from a Frozen Electron Configuration in Strained Epitaxial ${LaCoO}_{3}$ Sterbinsky, G. E.; Nanguneri, R.; Ma, J. X. Physical Review Letters, Vol. 120, Issue 19 https://doi.org/10.1103/physrevlett.120.197201	journal	May 2018
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Switchable orbital polarization and magnetization in strained $LaCo O_{3}$ films Guo, Er-Jia; Desautels, Ryan D.; Keavney, David Physical Review Materials, Vol. 3, Issue 1 https://doi.org/10.1103/physrevmaterials.3.014407	journal	January 2019
Direct imaging revealing halved ferromagnetism in tensile-strained $LaCo O_{3}$ thin films Feng, Qiyuan; Meng, Dechao; Zhou, Haibiao Physical Review Materials, Vol. 3, Issue 7 https://doi.org/10.1103/physrevmaterials.3.074406	journal	July 2019

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