Growth and Properties of Fully Strained SrCoOx (x ≈ 2.8) Thin Films on DyScO3

Hu, Shihao; Yue, Zengji; Lim, Ji Soo; Callori, Sara J.; Bertinshaw, Joel; Ikeda‐Ohno, Atsushi; Ohkochi, Takuo; Yang, Chan−Ho; Wang, Xiaolin; Ulrich, C.; Seidel, Jan

doi:10.1002/admi.201500012

Cited by 28 publications

(29 citation statements)

References 32 publications

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“…1b, the unit cell volume of the P-SCO ozone films increased monotonically with strain for all but the ε = 4.2% film, which may be due to a slight change in oxygen stoichiometry. [31] This increase was readily fit to a line ascribing all linear expansion to a Poisson ratio of ν ~ 0.26, which is a common value associated with cobaltites. [32] Similarly, the BM-SCO had a ν ~ 0.30, as seen in Figure S4.…”

Section: Structural Analysis Of Annealed Bm-sco and P-sco Filmsmentioning

confidence: 98%

Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films

Petrie

Mitra

Jeen

et al. 2016

Adv Funct Materials

215

160

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The ability to manipulate oxygen anion defects rather than metal cations in complex oxides is facilitating new functionalities critical for emerging energy and device technologies.However, the difficulty in activating oxygen at reduced temperatures hinders the deliberate control of an important defect, oxygen vacancies. Here, strontium cobaltite (SrCoO x ) is used to demonstrate that epitaxial strain is a powerful tool for manipulating the oxygen vacancy concentration even under highly oxidizing environments and at annealing temperatures as low as 300 °C. By applying a small biaxial tensile strain (2%), the oxygen activation energy barrier decreases by ~30%, resulting in a tunable oxygen deficient steady-state under conditions that would normally fully oxidize unstrained cobaltite. These strain-induced changes in oxygen stoichiometry drive the cobaltite from a ferromagnetic metal towards an antiferromagnetic insulator. The ability to decouple the oxygen vacancy concentration from its typical dependence on the operational environment is useful for effectively designing oxides materials with a specific oxygen stoichiometry.2

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Section: Structural Analysis Of Annealed Bm-sco and P-sco Filmsmentioning

confidence: 98%

Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films

Petrie

Mitra

Jeen

et al. 2016

Adv Funct Materials

215

160

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“…26. On DSO, the prepared films were nominally 20 nm thick, and those deposited on STO were 40 nm thick.…”

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confidence: 99%

“…1 (c)) no oxygen vacancy super structures could be identified, which indicate that the films are near a δ ≈ 0 oxygen stoichiometry. 8,26,27 . Additional x-ray absorption spectroscopy measurements did indicate that the oxygen content is close to optimal doping with δ 0.18 26 .…”

mentioning

confidence: 99%

“…8,26,27 . Additional x-ray absorption spectroscopy measurements did indicate that the oxygen content is close to optimal doping with δ 0.18 26 . To investigate the nature of the magnetic structure of the SCO films, magnetometry and neutron diffraction experiments were performed.…”

mentioning

confidence: 99%

“…The corresponding x-ray reciprocal space maps are presented in Ref. 26. It should be noted that any potential oxygen vacancies in SCO can also affect the out-of-plane lattice parameter.…”

mentioning

confidence: 99%

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Strain-induced magnetic phase transition inSrCoO3−δthin films

Callori

Bertinshaw

et al. 2015

Phys. Rev. B

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It has been well established that both in bulk at ambient pressure and for films under modest strains, cubic SrCoO 3−δ (δ < 0.2) is a ferromagnetic metal. Recent theoretical work, however, indicates that a magnetic phase transition to an antiferromagnetic structure could occur under large strain accompanied by a metal-insulator transition. We have observed a strain-induced ferromagnetic to antiferromagnetic phase transition in SrCoO 3−δ films grown on DyScO3 substrates, which provide a large tensile epitaxial strain, as compared to ferromagnetic films under lower tensile strain on SrTiO3 substrates. Magnetometry results demonstrate the existence of antiferromagnetic spin correlations and neutron diffraction experiments provide a direct evidence for a G-type antiferromagnetic structure with Neél temperatures between TN ∼ 135 ± 10 K and ∼ 325 ± 10 K depending on the oxygen content of the samples. Therefore, our data experimentally confirm the predicted strain-induced magnetic phase transition to an antiferromagnetic state for SrCoO 3−δ thin films under large epitaxial strain.The broad range of transition metal oxide functionalities, including superconductivity, magnetism, and ferroelectricity, can be tuned by the careful choice of parameters such as strain, oxygen content, or applied electric and magnetic fields 1-9 . This tunability makes transition metal oxide materials ideal candidates for use in developing novel information and energy technologies 10,11 . SrCoO 3 is a particularly interesting system for investigation. SrCoO 3−δ has long been studied due to its propensity to form oxygen-vacancy-ordered structures as the oxygen content is decreased. The system undergoes well-defined structural phase transitions between distinct topotactic phases, from a cubic perovskite phase at SrCoO 3 to brownmillerite SrCoO 2.5 . The ties between the structural and functional properties of the material are obvious as a magnetic phase transition from ferromagnetic (FM) SrCoO 3.0 with T C = 280-305 K to antiferromagnetic (AFM) SrCoO 2.5 with T N = 570 K accompanies the structural transition 5,[12][13][14] . This is similar to the case of SrFeO 3−δ , which has also been demonstrated to undergo oxygen vacancy ordering with magnetic phase transitions related to the structure and Fe charge ordering [17][18][19] .In addition to oxygen stoichiometry, other possibilities, such as strain or applied magnetic or electric fields, may be used to tune the system. Lee and Rabe have simulated the effect of epitaxial strain on SrCoO 3.0 and predict a large polar instability resulting in a dependence of the magnetic structure on strain 20,21 . Their results show that the magnetic state can be controlled by the amount of compressive or tensile strain applied. An AFM-FM transition is predicted at both, tensile strain of ∼2.0 % and compressive strain of approximately -0.8 %, which is caused through the Goodenough-Kanamori rules as a consequence of simultaneous structural phase transitions between phases with different distortions and rotational pa...

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Facile Pathways to Synthesize Perovskite Strontium Cobalt Oxides

Yin

Wang

et al. 2022

Adv Funct Materials

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Topotactic phase transition obtains extensive research attention due to its associated rich physics as well as a promising potential application. Particularly, the oxygen incorporation into brownmillerite oxides leads to the structural transition into perovskite oxides with distinct magnetic and electronic properties. Using brownmillerite SrCoO 2.5 (BM-SCO), two novel pathways are revealed to achieve the topotactic phase transition into its corresponding perovskite SrCoO 3 (P-SCO). It is demonstrated that by using aqueous alkali as the electrolyte during gating, the negative biased voltage triggers a rapid transition into P-SCO, which is attributed to the presence of strong oxidizing hydroxyl radicals. While surprisingly, it is observed that the acid solution with rich protons can also trigger an unexpected phase transition from BM-SCO into P-SCO in a much faster manner. With density functional theory calculations, this transition is elucidated as a proton-assist ionic disproportionation, in which the Co ions are simultaneously oxidized and reduced, while the latter one is dissolved within the solution. These case studies not only achieve a deep understanding of the structural phase transition in BM-SCO but also shed new light on the topotactic phase transition of complex oxides.

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Growth and Properties of Fully Strained SrCoO_x (x ≈ 2.8) Thin Films on DyScO₃

Cited by 28 publications

References 32 publications

Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films

Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films

Strain-induced magnetic phase transition inSrCoO3−δthin films

Facile Pathways to Synthesize Perovskite Strontium Cobalt Oxides

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