In-situ fabrication of Tl-based superconducting thin films by two-zone RF-sputtering

1997 ◽  
Vol 7 (2) ◽  
pp. 1891-1894 ◽  
Author(s):  
S.J. Wang ◽  
J.Y. Juang ◽  
L.C. Shih ◽  
C.S. Nee ◽  
K.H. Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Rf Sputtering ◽  
Superconducting Thin Films ◽  
In Situ Fabrication

In‐Situ Fabrication of YBa2Cu3O7‐x Superconducting Thin Films Directly on Silicon Substrates with Tc0 > 77K

1989 ◽  
Vol 169 ◽  
Author(s):  
C. B. Lee ◽  
R. K. Singh ◽  
S. Sharan ◽  
A. K. Singh ◽  
P. Tiwari ◽  
...  
Keyword(s):  
Thin Films ◽  
Laser Pulses ◽  
Superconducting Film ◽  
Laser Evaporation ◽  
Silicon Substrates ◽  
Superconducting Thin Films ◽  
Si Substrates ◽  
In Situ Fabrication ◽  
Substrate Temperatures

AbstractWe report in‐situ fabrication of c‐axis textured YBa2Cu3O7‐x superconducting thin films with Tco > 77K on unbuffered silicon substrates by the biased pulsed laser evaporation (PLE) technique in the temperature range of 550‐650°C. At substrate temperatures below 550°C, no c‐axis texturing of the superconducting film was observed. The YBa2Cu3O7‐x superconducting films were fabricated by ablating a bulk YBa2Cu3O7 target by a XeCl excimer laser (λ = 308 nm, τ = 45 × 10‐9 sec) in a chamber maintained at an oxygen pressure of 0.2 torr . The thickness of the films was varied from 0.3 to 0.5 nm depending on the number of laser pulses. Extensive diffusion was observed in thin films deposited at substrate temperatures above 550°C. However, microstructurally, with increase in the substrate temperature the films exhibited larger grain size and greater degree of c‐axis texturing (measured by the ratio of the (005) and (110) X‐ray diffraction peaks). This was found to give rise to better superconducting properties with Tco exceeding 77 K for YBa2Cu3O7‐x films deposited on Si substrates at 650°C.

EFFECT OF OXYGEN DOPING IN ab-PLANE OF Bi2Sr2CaCu2Oy THIN FILMS GROWN ON VICINAL SrTiO3 SUBSTRATES: PSEUDOGAP EFFECT

2006 ◽  
Vol 20 (24) ◽  
pp. 1559-1565
Author(s):  
V. TOMA ◽  
G. ILONCA ◽  
H. RAFFY
Keyword(s):  
Thin Films ◽  
Tilt Angle ◽  
Basal Plane ◽  
Rf Sputtering ◽  
Superconducting Thin Films ◽  
Characteristic Temperatures ◽  
Oriented Film ◽  
Linear Behavior ◽  
Effect Of Oxygen

The in-plane resistivity ρab(T) are measured for Bi 2 Sr 2 CaCu 2 O 8 superconducting thin films successfully deposited by in situ magnetron RF-sputtering on vicinal (100) SrTiO 3 substrates. Oriented film with c-axis inclined with respect to the basal plane by a tilt angle α≈4° was obtained. The oxygen content of the film was changed from the maximally overdoped state to strongly underdoped nonsuperconducting states. It was found that for underdoped and overdoped regions ρab(T) deviates from the high T-linear behavior at characteristic temperatures T* and T**.

OUT-OF-PLANE PSEUDOGAP IN Bi2Sr2CaCu2Oy THIN FILMS GROWN ON SrTiO3 VICINAL SURFACES

2007 ◽  
Vol 21 (02) ◽  
pp. 241-247
Author(s):  
V. TOMA ◽  
H. RAFFY
Keyword(s):  
Thin Films ◽  
Oxygen Content ◽  
Tilt Angle ◽  
Basal Plane ◽  
Rf Sputtering ◽  
Superconducting Thin Films ◽  
Vicinal Surfaces ◽  
Oriented Film ◽  
Out Of Plane

The out-of-plane resistivity ρc(T) is measured for Bi 2 Sr 2 CaCu 2 O 8 superconducting thin films successfully deposited by in situ magnetron RF–sputtering on vicinal (100) SrTiO 3 substrates. Oriented film with c-axis inclined with respect to the basal plane by a tilt angle α≈4° was obtained. The oxygen content of the film was changed from maximally overdoped state to strongly underdoped nonsuperconducting states. It was found that the temperature corresponding to the minimum between metallic and semiconductive behavior appears to reflect the opening of the pseudogap for transport along c-axis. We found that the opening of the pseudogap along c-axis does not coincide with pseudogap seen in ab plane.

Pulsed Laser Deposition of High Tc Superconducting Thin Films: Deposition Physics and in-Situ Processing

1989 ◽  
Vol 169 ◽  
Author(s):  
Rajiv K. Singh ◽  
J. Narayan
Keyword(s):  
Thin Films ◽  
Three Dimensional ◽  
Pulsed Laser ◽  
Laser Evaporation ◽  
Superconducting Thin Films ◽  
High Tc ◽  
Ion Channeling ◽  
In Situ Fabrication ◽  
Current Densities

AbstractThe pulsed laser evaporation (PLE) technique for deposition of thin films is characterized by a number of unique properties. Based on the experimental characteristics, a theoretical model is developed which considers the formation and anisotropic three dimensional expansion of the laser generated plasma. This model explains most of the experimental features observed in PLE. We have also employed the PLE technique for in-situ fabrication of YBa2Cu3O7 superconducting thin films on different substrates in the temperature range of 500–650°C. At temperatures below 600–C, a biased interposing ring between the substrate and the target was found to significantly improve the superconducting properties. The minimum ion channeling yields were between 3-3.5 % for films deposited on (100) SrTiO3 and (100) LaA1O3 substrates. The films exhibit very high critical current densities (Jc) with maximum values exceeding 6.5 x 106 amps/cm2 for silver doped YBa2Cu3O7 films on (100) LaA1O3 substrates, and the Jc also varies anisotropically with the magnetic field.

ANISOTROPIC RESISTIVITY IN Bi2Sr2CaCu2Oy THIN FILMS GROWN ON VICINAL SrTiO3 SUBSTRATES

2006 ◽  
Vol 20 (10) ◽  
pp. 1261-1268
Author(s):  
V. TOMA ◽  
G. ILONCA ◽  
H. RAFFY
Keyword(s):  
Thin Films ◽  
Rf Sputtering ◽  
Superconducting Thin Films ◽  
Resistivity Measurements ◽  
Oriented Film ◽  
Linear Behavior ◽  
Underdoped Region ◽  
Out Of Plane ◽  
Semiconducting Behavior

The in-plane resistivity ρab(T) and out-of-plane resistivity ρc(T) are measured for Bi 2 Sr 2 CaCu 2 O 8 superconducting thin films successfully deposited by in situ magnetron RF-sputtering on vicinal (100) SrTiO 3 substrates. Oriented film with c axis inclined with respect to the basal plane by a tilt angle α ≈ 4° was obtained. It was found that for the underdoped region ρab(T) deviates from the high T-linear behavior, which evidences the opening of the pseudogap while from the out-of-plane resistivity measurements, we found that the temperature corresponding to the minimum between metallic and semiconducting behavior appears to reflect the opening of the pseudogap for transport along c axis. We also found that the opening of the pseudogap seen in ρab(T) does not coincide with the pseudogap along c axis.

XPS Study of Bi-Sr-Ca-Cu-O Superconducting Thin Films Prepared by the rf-Sputtering Method

1989 ◽  
Vol 28 (Part 2, No. 2) ◽  
pp. L233-L235 ◽  
Author(s):  
Atsuo Fukui ◽  
Hiroyuki Enomoto ◽  
Hidetaka Natsume ◽  
Yoshiki Takano ◽  
Natsuki Mori ◽  
...  
Keyword(s):  
Thin Films ◽  
Rf Sputtering ◽  
Superconducting Thin Films ◽  
Xps Study

IN-SITU PREPARATION OF YBa2Cu3O7 SUPERCONDUCTING THIN FILMS BY PULSED Nd:YAG LASER DEPOSITION

1992 ◽  
Vol 06 (08) ◽  
pp. 477-483 ◽  
Author(s):  
QINGXIN SU ◽  
SHIFA XU ◽  
DAFU CUI ◽  
HUIBIN LU ◽  
YONGJUN TIAN ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Nd:Yag Laser ◽  
Ac Susceptibility ◽  
Substrate Surface ◽  
Zero Magnetic Field ◽  
Superconducting Thin Films ◽  
In Situ Preparation ◽  
Zero Resistance

High-T c superconducting thin films of YBa 2 Cu 3 O 7 were grown in-situ on (100) SrTiO 3 substrates by Nedymium:yttrium aluminum garnet [Nd:YAG] laser ablation. The effects of the substrate temperature on the transition temperature, microcrystalline structure and surface morphology of the films were discussed. Best results were obtained in the 730°–770°C range. X-ray diffraction analysis showed that these films were highly c-oriented with the c-axis perpendicular to the substrate surface. At the optimum substrate temperature, a very smooth morphology with only a few small particles were observed by scanning electron microscopy. The zero resistance temperature of these films were ≥ 90 K with a narrow transition width and the ac susceptibility measurement also gave the same result. The highest critical current density obtained at 77 K and zero magnetic field was 3.8 × 106 A/cm 2.

In situ fabrication of anatase thin films with high percentage of exposed {001} facets to improve biocompatibility with MC3T3-E1 cells

2020 ◽  
Vol 55 (28) ◽  
pp. 14008-14018 ◽  
Author(s):  
Fan Xiao ◽  
Jun Xiang ◽  
Gang Cheng ◽  
Zhenlan Jiang ◽  
Akiyoshi Osaka ◽  
...  
Keyword(s):  
Thin Films ◽  
In Situ Fabrication
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