Spontaneous phase segregation of SrNiO and SrNiO during SrNiO heteroepitaxy
Wang, Le (Pacific Northwest National Laboratory (Richland, Estats Units). Physical and Computational Sciences Directorate)
Yang, Zhenzhong (Pacific Northwest National Laboratory (Richland, Estats Units). Physical and Computational Sciences Directorate)
Yin, Xinmao (National University of Singapore. Department of Physics)
Taylor, Sandra D. (Pacific Northwest National Laboratory (Richland, Estats Units). Physical and Computational Sciences Directorate)
He, Xu (Institut Català de Nanociència i Nanotecnologia)
Tang, Chi Sin (National University of Singapore. NUS Graduate School for Integrative Sciences and Engineering)
Bowden, Mark E. (Pacific Northwest National Laboratory (Richland, Estats Units). Environmental Molecular Sciences Laboratory)
Zhao, Jiali (Beijing Synchrotron Radiation Facility)
Wang, Jiaou (Beijing Synchrotron Radiation Facility)
Liu, Jishan (Pacific Northwest National Laboratory (Richland, Estats Units). Physical and Computational Sciences Directorate)
Perea, Daniel E. (Pacific Northwest National Laboratory (Richland, Estats Units). Earth and Biological Sciences Directorate)
Wangoh, Linda (Pacific Northwest National Laboratory (Richland, Estats Units). Physical and Computational Sciences Directorate)
Wee, Andrew T. S. (National University of Singapore. Department of Physics)
Zhou, Hua (Argonne National Laboratory (Lemont, Estats Units). X-ray Science Division)
Chambers, Scott A. (Pacific Northwest National Laboratory (Richland, Estats Units). Physical and Computational Sciences Directorate)
Du, Yingge (Pacific Northwest National Laboratory (Richland, Estats Units). Physical and Computational Sciences Directorate)

Fecha:	2021
Resumen:	Recent discovery of superconductivity in Nd0. 8Sr0. 2NiO2 motivates the synthesis of other nickelates for providing insights into the origin of high-temperature superconductivity. However, the synthesis of stoichiometric R1−xSrxNiO3 thin films over a range of x has proven challenging. Moreover, little is known about the structures and properties of the end member SrNiO3. Here, we show that spontaneous phase segregation occurs while depositing SrNiO3 thin films on perovskite oxide substrates by molecular beam epitaxy. Two coexisting oxygen-deficient Ruddlesden-Popper phases, Sr2NiO3 and SrNi2O3, are formed to balance the stoichiometry and stabilize the energetically preferred Ni2+ cation. Our study sheds light on an unusual oxide thin-film nucleation process driven by the instability in perovskite structured SrNiO3 and the tendency of transition metal cations to form their most stable valence (i. e. , Ni2+ in this case). The resulting metastable reduced Ruddlesden-Popper structures offer a testbed for further studying emerging phenomena in nickel-based oxides.
Ayudas:	European Commission 814487
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	Science advances, Vol. 7, issue 10 (March 2021) , art. eabe2866, ISSN 2375-2548

DOI: 10.1126/sciadv.abe2866
PMID: 33674310

8 p, 1.7 MB

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