Abstract
Rare-earth nickelates (such as perovskite RNiO3, trilayer R4Ni3O10, and infinite layer RNiO2) have attracted tremendous interest very recently. However, unlike the widely studied RNiO3 and RNiO2 films, the synthesis of trilayer nickelate R4Ni3O10 films is rarely reported. Here, single-crystalline (Nd0.8Sr0.2)4Ni3O10 epitaxial films were coherently grown on SrTiO3 substrates by high-pressure magnetron sputtering. The crystal and electronic structures of (Nd0.8Sr0.2)4Ni3O10 films with oxygen ligand holes were characterized by high-resolution x-ray diffraction, x-ray photoemission spectroscopy, and resonant soft x-ray absorption spectroscopy. The electrical transport measurements reveal a metal–insulator transition behavior near 82 K and negative magnetoresistance in (Nd0.8Sr0.2)4Ni3O10 films. Our work provides a novel route to synthesize high-quality trilayer nickelate R4Ni3O10 films with RNiO3 targets by high-pressure magnetron sputtering.
Highlights
Transition metal oxides with a strong entanglement between spin, charge, orbital, and lattice degrees of freedom conceive a large number of emergent phenomena such as high-temperature superconductivity, colossal magnetoresistance, room-temperature multiferrocity, and metal–insulator transition.1–6 One remarkable example of these transition metal oxides is rare-earth (R) nickelates in which metal–insulator transition, magnetic transition, and crystal structural transition were observed in perovskite nickelate RNiO3,7–12 whereas superconductivity (∼15 K) presents in the infinite-layer nickelate RNiO2 with doping.13–21 Unlike the comprehensively studied RNiO3 and RNiO2 films,22–28 exploring trilayer nickelate R4Ni3O10 films is very rare.14,29 Since strontium-dopedRNiO3 is the parent compound of superconducting RNiO2,13,14 it naturally brings up an interesting question about understanding the properties of strontium-doped R4Ni3O10
Our work provides a novel route to synthesize high-quality trilayer nickelate R4Ni3O10 films with RNiO3 targets by high-pressure magnetron sputtering
The x-ray absorption spectroscopy (XAS) measurements were performed at the beamline 02B02 of the SiP⋅ME2 platform at the Shanghai Synchrotron Radiation Facility (SSRF)
Summary
Transition metal oxides with a strong entanglement between spin, charge, orbital, and lattice degrees of freedom conceive a large number of emergent phenomena such as high-temperature superconductivity, colossal magnetoresistance, room-temperature multiferrocity, and metal–insulator transition. One remarkable example of these transition metal oxides is rare-earth (R) nickelates in which metal–insulator transition, magnetic transition, and crystal structural transition were observed in perovskite nickelate RNiO3,7–12 whereas superconductivity (∼15 K) presents in the infinite-layer nickelate RNiO2 with doping. Unlike the comprehensively studied RNiO3 and RNiO2 films, exploring trilayer nickelate R4Ni3O10 films is very rare. Since strontium-doped. Transition metal oxides with a strong entanglement between spin, charge, orbital, and lattice degrees of freedom conceive a large number of emergent phenomena such as high-temperature superconductivity, colossal magnetoresistance, room-temperature multiferrocity, and metal–insulator transition.. One remarkable example of these transition metal oxides is rare-earth (R) nickelates in which metal–insulator transition, magnetic transition, and crystal structural transition were observed in perovskite nickelate RNiO3,7–12 whereas superconductivity (∼15 K) presents in the infinite-layer nickelate RNiO2 with doping.. Unlike the comprehensively studied RNiO3 and RNiO2 films, exploring trilayer nickelate R4Ni3O10 films is very rare.. RNiO3 is the parent compound of superconducting RNiO2,13,14 it naturally brings up an interesting question about understanding the properties of strontium-doped R4Ni3O10. Our work provides a novel route to synthesize high-quality trilayer nickelate R4Ni3O10 films
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