scholarly journals Spontaneous phase segregation of Sr2NiO3 and SrNi2O3 during SrNiO3 heteroepitaxy

2021 ◽  
Vol 7 (10) ◽  
pp. eabe2866
Author(s):  
Le Wang ◽  
Zhenzhong Yang ◽  
Xinmao Yin ◽  
Sandra D. Taylor ◽  
Xu He ◽  
...  
Keyword(s):  
Thin Films ◽  
Molecular Beam ◽  
High Temperature Superconductivity ◽  
Phase Segregation ◽  
Perovskite Oxide ◽  
Oxide Thin Film ◽  
Structures And Properties ◽  
Oxide Substrates ◽  
Film Nucleation ◽  
Spontaneous Phase

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.

Oxide thin film properties

2021 ◽  
pp. 84-126
Author(s):  
Falko P. Netzer ◽  
Claudine Noguera
Keyword(s):  
Thin Films ◽  
Chemical Reactivity ◽  
Finite Thickness ◽  
Chemical Properties ◽  
Local Environment ◽  
Oxide Thin Film ◽  
Special Focus ◽  
Physico Chemical ◽  
Oxide Substrates ◽  
Interfacial Dislocations

Chapter 4 focuses on the various physico-chemical properties of thin films, and in particular on their thickness dependence. It aims at bridging the gap between the well established knowledge acquired on oxide surfaces and truely two-dimensional oxides. It reviews the consequences of the reduced local environment of their atoms and of the confinement effects due to their finite thickness. It analyzes the various manifestations of structural, electronic, vibrational, ferroelectric and magnetic modifications. A special focus is put on the interaction of thin films with metal or oxide substrates, possibly leading to interfacial dislocations, electron transfer or mixing, with consequences on their chemical reactivity.

scholarly journals Nanosized Pinning Centers in the Rare Earth-Barium-Copper-Oxide Thin-Film Superconductors

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1429 ◽  
Author(s):  
Filip Antončík ◽  
Ondřej Jankovský ◽  
Tomáš Hlásek ◽  
Vilém Bartůněk
Keyword(s):  
Thin Films ◽  
Rare Earth ◽  
Mixed Oxides ◽  
High Temperature Superconductivity ◽  
Barium Copper Oxide ◽  
Oxide Thin Film ◽  
Pinning Centers ◽  
Barium Copper ◽  
The Individual ◽  
Copper Oxide Thin Film

Since the discovery of high-temperature superconductivity, significant progress in the fabrication of REBCO-based (Rare Earth Barium Copper mixed Oxides) thin-films superconductors has been achieved. In our review, we described the approaches and possibilities of the improvement of superconducting properties by the introduction of nanosized pinning centers. We focused on the synthesis and viability of the material for artificial pinning centers and methods used for the introduction of the pinning centers into superconducting REBCO-based thin-films. This article summarizes available materials and procedures regardless of the financial cost of the individual method. According to available literature, the most significant superconducting REBCO tapes can be obtained when a combination of 1D and 0D nanoparticles are used for nanoscale pinning.

Cubic ZnxMg1−xO thin films grown by plasma-assisted molecular-beam epitaxy for optoelectronic applications

2010 ◽  
Vol 25 (6) ◽  
pp. 1072-1079 ◽  
Author(s):  
J.W. Mares ◽  
R.C. Boutwell ◽  
A. Scheurer ◽  
W.V. Schoenfeld
Keyword(s):  
Thin Films ◽  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Phase Segregation ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zn Concentration ◽  
Zinc Concentrations ◽  
Lattice Matched

Heteroepitaxial ZnxMg1−xO thin films were grown on lattice-matched MgO (100) substrates using radiofrequency plasma-assisted molecular-beam epitaxy. High-quality epilayers with zinc concentrations ranging from x = 0 (MgO) to x = 0.65 were grown and characterized optically, structurally, and electrically. The ZnxMg1−xO films were found to maintain the rocksalt cubic (B1) crystal structure for concentrations z < 0.65, with a linear dependence of lattice constant on Zn concentration. X-ray diffraction (XRD) also revealed the emergence of phase segregation into wurtzite (B4) phase for the highest concentration film. The band gap energy of the films was successfully varied from 4.9 to 6.2 eV (253–200 nm), showing a linear relationship with Zn concentration. The strictly cubic films exhibit roughness on the order of 10 Å and resistivities of approximately 106 Ω·cm.

Defect engineering in perovskite oxide thin films

2021 ◽  
Author(s):  
Yunlong Sun ◽  
Jack Yang ◽  
Danyang Wang ◽  
Sean Li
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Perovskite Oxide ◽  
Oxide Thin Film ◽  
Multifunctional Materials ◽  
Defect Engineering ◽  
Oxide Thin Films ◽  
Photovoltaic Properties ◽  
Microelectronic Devices ◽  
Perovskite Oxide Thin Films

Perovskite oxide thin film is a category of multifunctional materials that have intriguing electrical, magnetic, and photovoltaic properties that can be harnessed combinatorially in future microelectronic devices. However, the inevitable...

scholarly journals Tailored surfaces of perovskite oxide substrates for conducted growth of thin films

2014 ◽  
Vol 43 (7) ◽  
pp. 2272-2285 ◽  
Author(s):  
Florencio Sánchez ◽  
Carmen Ocal ◽  
Josep Fontcuberta
Keyword(s):  
Thin Films ◽  
Single Crystals ◽  
Perovskite Oxide ◽  
Functional Nanostructures ◽  
Oxide Substrates ◽  
Tailored Surfaces

Overview of strategies for chemical termination control in perovskite single crystals and their use for the smart fabrication of functional nanostructures.

Perovskite Oxide Thin Film Heterostructures for IR Detector

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3381-3384
Author(s):  
N. J. Wu ◽  
A. Ignatiev ◽  
Y. S. Chen
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Infrared Detectors ◽  
Pulsed Laser ◽  
Ferroelectric Thin Films ◽  
Laser Deposition ◽  
Perovskite Oxide ◽  
Oxide Thin Film ◽  
Deposition Technique ◽  
Ir Detector

Mn and Sb-doped PbZrTiO 3 (PMSZT) ferroelectric thin films were integrated to high-T c superconducting YB2Cu3O 7-x (YBCO) thin films on LaAlO 3 (100) and YSZ/Si (100) substrates by the pulsed laser deposition technique. The PZT/YBCO and PM-SZT/YBCO infrared detectors were fabricated and examined as to their photovoltage and photocurrent in response to IR source temperature, and IR wavelength. The detector has relatively high IR sensitivity with a detectivity of ~ 108 cm · Hz 1/2/ W in the wavelength range of 3–16 μm.

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