Growth and recrystallization of CeO2 thin films deposited on R-plane sapphire by off-axis RF sputtering

Španková, M.; Vávra, I.; Gaži, Š.; Machajdík, D.; Chromík, Š.; Fröhlich, K.; Hellemans, Louis; Beňačka, Š.

doi:10.1016/s0022-0248(00)00585-6

Cited by 41 publications

(34 citation statements)

References 12 publications

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“…>From the absorption part of AC susceptibility the so-called contact-less critical current densities were calculated. The critical currents can be derived from the position of the absorption peaks employing Bean's critical state model and its extensions [11]. At the peak temperature the AC eld amplitude H ac penetrates into the sample and the current induced by the magnetic eld ows uniformly throughout the entire sample and is equal to the critical current density.…”

Section: Measuring Techniquesmentioning

confidence: 99%

“…At the peak temperature the AC eld amplitude H ac penetrates into the sample and the current induced by the magnetic eld ows uniformly throughout the entire sample and is equal to the critical current density. The Bean's model yields the following equation for the critical current density [11]:…”

Section: Measuring Techniquesmentioning

confidence: 99%

“…From the absorption parts of AC susceptibility and the width of the hysteresis loops the critical current densities as a function of temperature were calculated using the Bean critical state model [11] and these results were compared with the rhenium free thallium based sample.…”

Section: Introductionmentioning

confidence: 99%

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Magnetization, Susceptibility and Critical Currents of (Tl_2-xRe_x)Ba₂CaCu₂O_yThin Films

et al. 2012

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The magnetization and the AC susceptibility vs. the temperature as well as the applied magnetic eld of the thin lm (Tl2−xRex)Ba2CaCu2Oy with x = 0 and 0.15 on R-plane sapphire substrate with CeO2 buer layer were measured and analyzed. XRD measurements show c-axis as well as ab plane oriented Tl-1212 and superconducting pure phase. The zero critical temperature of the TlRe sample is 99.9 K and is practically the same as the critical temperature of the rhenium free sample: 99.5 K. The TlRe superconductor exhibits two peaks of the absorption part of AC susceptibility in the vicinity of the critical temperature in contrary to the rhenium free sample. The rst peak placed in higher temperature is related to intragranular properties while the second peak is connected with the intergranular one. The critical current densities versus temperature were calculated from AC susceptibility as well as from the magnetization loops measurements using the Bean's critical state model. The TlRe lm exhibits the higher critical current in comparison to the rhenium free thallium based lm.

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Section: Measuring Techniquesmentioning

confidence: 99%

Section: Measuring Techniquesmentioning

confidence: 99%

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Magnetization, Susceptibility and Critical Currents of (Tl_2-xRe_x)Ba₂CaCu₂O_yThin Films

et al. 2012

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“…To avoid high microwave losses in such application, it is necessary to grow lms on sapphire substrates, with suitable buer layer to improve matching of the lattice parameters and to prevent chemical reaction between the superconductor and the substrate. It has been found that CeO 2 is the excellent material for the buer between the sapphire and the YBCO [3,4]. It is chemically very stable, it has high melting temperature (2400…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Superconducting Properties of Laser Ablated YBa₂Cu₃O_7-δFilms on CeO₂-Buffered Sapphire

et al. 2012

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We use pulsed laser deposition to grow YBa2Cu3O 7−δ (YBCO) superconducting lms for microwave applications. The lms are grown on R-cut sapphire substrates, with CeO2 buer layers, which are re-crystallized at high temperature prior to YBCO growth. Using the atomic force microscopy (AFM) and X-ray diractometry we determine the optimal temperature for recrystallization (1000• C) and the optimal buer layer thickness (30 nm).The properties of YBCO lms of various thickness, grown on the optimized CeO2 buer layers, are studied using several methods, including AFM, magnetooptical imaging, and transport experiments. The YBCO lm roughness is found to increase with the increasing lm thickness, but the magnetic ux penetration in the superconducting state remains homogeneous. The superconducting parameters (the critical temperature and the critical current density) are somewhat lower than the similar parameters for YBCO lms deposited on mono-crystalline substrates.

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“…This substrate has a low dielectric constant and high mechanical strength [2]. R-plane sapphire is highly chemically reactive towards TlBa-Ca-Cu-O films and shows a mismatch of ε = 17%.…”

Section: Introductionmentioning

confidence: 99%

Influence of the reaction conditions on the formation of Tl(Re)-Ba-Ca-Cu-O superconducting thin films by thallination in open system

Dujavová¹,

Valeriánová²,

Štrbı́k³

et al. 2007

Open Physics

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Rhenium avoids air degradation of the target as well as of precursor thin films during the preparation of high temperature Tl-based superconductors. Addition of Re has been used during synthesis of oriented Tl(Re)-Ba-Ca-Cu-O films. High temperature superconducting Tlbased thin films were prepared by a two step method combining RF magnetron sputtering and ex-situ thallination. Precursors with a composition of Re 0.1 Ba 2 Ca 2 Cu 3 O x were deposited on a CeO 2 buffered R-plane sapphire substrate. The sputtered films were prepared at room temperature in an Ar atmosphere. The thallination of the precursor films was performed in a one zone configuration, where both the pellet and precursor film were kept at the same temperature. The thallination temperature varied in the range of 850 -880• C and samples were held for 30, 45 and 60 min at this temperature in a flowing oxygen atmosphere. Besides Tl-2212, X-ray diffraction reveals the possibility of also preparing the Tl-2223 phase, which was until now not reported in a Re doped form.

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Growth and recrystallization of CeO2 thin films deposited on R-plane sapphire by off-axis RF sputtering

Cited by 41 publications

References 12 publications

Magnetization, Susceptibility and Critical Currents of (Tl_2-xRe_x)Ba₂CaCu₂O_yThin Films

Magnetization, Susceptibility and Critical Currents of (Tl_2-xRe_x)Ba₂CaCu₂O_yThin Films

Optimization of the Superconducting Properties of Laser Ablated YBa₂Cu₃O_7-δFilms on CeO₂-Buffered Sapphire

Influence of the reaction conditions on the formation of Tl(Re)-Ba-Ca-Cu-O superconducting thin films by thallination in open system

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Growth and recrystallization of CeO2 thin films deposited on R-plane sapphire by off-axis RF sputtering

Cited by 41 publications

References 12 publications

Magnetization, Susceptibility and Critical Currents of (Tl2-xRex)Ba2CaCu2OyThin Films

Magnetization, Susceptibility and Critical Currents of (Tl2-xRex)Ba2CaCu2OyThin Films

Optimization of the Superconducting Properties of Laser Ablated YBa2Cu3O7-δFilms on CeO2-Buffered Sapphire

Influence of the reaction conditions on the formation of Tl(Re)-Ba-Ca-Cu-O superconducting thin films by thallination in open system

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Magnetization, Susceptibility and Critical Currents of (Tl_2-xRe_x)Ba₂CaCu₂O_yThin Films

Magnetization, Susceptibility and Critical Currents of (Tl_2-xRe_x)Ba₂CaCu₂O_yThin Films

Optimization of the Superconducting Properties of Laser Ablated YBa₂Cu₃O_7-δFilms on CeO₂-Buffered Sapphire