Local conductance spectra of itinerant ferromagnetic SrRuO<sub>3</sub> through break junction

Kambara, Hiroshi; Obinata, Y.; Tenya, Kenichi; Tsujii, H.

doi:10.7567/jjap.55.093004

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…After crushing the pellets, the above process was then repeated. Typically, the range of grain sizes of sintered SRO is approximately 0.1-1 µm, which we obtained from scanning electron microscope images 11 .…”

Section: Experimental Methodsmentioning

confidence: 99%

Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Kambara

Tanaka

Oishi

et al. 2020

Journal of Applied Physics

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Using interface-sensitive resistance measurement techniques, we detected the reducing reaction precursor at the interface between the metallic oxide SrRuO 3 and the electrodes under a hydrogenous atmosphere at room temperature. The interface resistance between this polycrystalline oxide and the electrodes (metallic pads or wires) clearly increased with the hydrogen present even at room temperature. In contrast, for bulk SrRuO 3 , no increase in resistance was found. The rate of increase of the interface resistance depends on the electrode material. For example, that of SrRuO 3 -Ag is larger than that of SrRuO 3 -Cu, and the rate is related to the propensity for bulk oxide to reduce; Ag 2 O is easier to reduce than CuO. The origin of the increase in interface resistance is posited to be the partial deficiency of oxygen in SrRuO 3 . Our experiments suggest that the reduction at the interface of SrRuO 3 occurs at relatively low temperatures (room temperature) compared with the bulk reducing temperature of ∼ 200 • C previously reported. In addition, electrode materials control the reducing reaction at the interface.

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Section: Experimental Methodsmentioning

confidence: 99%

Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Kambara

Tanaka

Oishi

et al. 2020

Journal of Applied Physics

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Investigation of time variations of redox reactions in SrRuO3 through interface-sensitive resistance measurements

Kambara

Shimazaki

Tenya

2023

Journal of Applied Physics

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We used an interface-sensitive resistance measurement technique to observe the time evolution of the early stages of redox reactions at the interface between the metallic oxide SrRuO[Formula: see text] and a silver epoxy electrode at around room temperature ([Formula: see text]–320 K). On exposure to a reducing gas (CO or H[Formula: see text]), the interface resistance gradually increased. The time variation functions of the resistance increases for CO and H[Formula: see text] were similar, although the magnitude was greater for H[Formula: see text] than for CO. After substitution of O[Formula: see text] for the reducing gas, the interface resistance decreased to almost the initial value, i.e., that before exposure to a reducing gas. The resistance variations can be well explained by the time variations of the oxygen deficiency at the SrRuO[Formula: see text] interface and subsurfaces as a result of reduction or oxidation. We regarded the reactions as pseudo-first-order reactions and evaluated the rate constants of the SrRuO[Formula: see text] redox reactions at a SrRuO[Formula: see text]–Ag interface. For the reduction (resistance increase) process, a single exponential component was enough to fit the data, which suggests that the reduction proceeds successively from outside to inside the bulk. Adsorption of oxygen atoms in the oxidation (resistance decrease) process involved several rate constants, at least up to three exponential components, depending on the prior degradation by a reducing gas. The effective activation energy of each redox reaction was evaluated from an Arrhenius plot.

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Local conductance spectra of itinerant ferromagnetic SrRuO₃ through break junction

Cited by 2 publications

References 28 publications

Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Investigation of time variations of redox reactions in SrRuO3 through interface-sensitive resistance measurements

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Local conductance spectra of itinerant ferromagnetic SrRuO3 through break junction

Cited by 2 publications

References 28 publications

Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Room-temperature reduction at SrRuO3–metal interface in hydrogenous atmosphere detected by interface-sensitive resistance measurement

Investigation of time variations of redox reactions in SrRuO3 through interface-sensitive resistance measurements

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Local conductance spectra of itinerant ferromagnetic SrRuO₃ through break junction