Preparation and structural characterization of thin epitaxial Bi2Sr2CaCu2O8+δ films with Tc in the 90 K range

Wagner, Patrick; Hillmer, F.; Frey, Urban; Adrian, H.; Steinborn, T.; Ranno, Laurent; Elschner, Andreas; Heyvaert, I.; Bruynseraede, Y.

doi:10.1016/0921-4534(93)90372-w

Cited by 55 publications

(12 citation statements)

References 19 publications

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“…8. We investigated an oxygenated film, Bi-2212ox ͑which, after deposition, was maintained for 3 h at 600°C in a 10-Torr oxygen atmosphere͒, and a reduced film, Bi-2212va ͑annealed at 500°C for 3 h ''in vacuum,'' i.e., 5ϫ10 Ϫ2 Torr oxygen͒.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

Vortex-liquid entanglement inBi2Sr2CaCu2
Miu
¹
,
Jakob
²
,
Haibach
³

et al. 1998
Phys. Rev. B
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We have investigated the thermally activated behavior of the in-plane electrical resistivity of Bi 2 Sr 2 CaCu 2 O 8ϩ␦ films for magnetic fields Bр10 4 G applied parallel to the c axis. The activation energy in the vortex-liquid state changes suddenly at a crossover field B cr . The anisotropy reduction generated by oxygen annealing leads to the increase of the crossover field. For BϽB cr , the activation energy U is weakly magnetic-field dependent. For BϾB cr , U(B,T)ϳ(1ϪT/T c0 )/B 1/2 , which corresponds to an entangled vortex fluid. The observation of vortex-liquid entanglement in the presence of relevant quenched disorder is discussed in connection with the relation between the theoretically predicted entanglement length for a clean system and the collective pinning length along the field direction. Our results suggests that, in the case of a pronounced anisotropy and significant collective pinning, the entanglement field B E ϭB cr Ϸ⌽ 0 /␥ 2 s 2 , where s is the interlayer spacing.

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Section: Sample Preparation and Characterizationmentioning

confidence: 99%

Vortex-liquid entanglement inBi2Sr2CaCu2
Miu
¹
,
Jakob
²
,
Haibach
³

et al. 1998
Phys. Rev. B
Self Cite
25
2
11
0
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“…In Bi 2 Sr 2 CaCu 2 O 8ϩ␦ films deposited onto SrTiO 3 by almost the same sputtering technique as described above, Ti was found to interdiffuse not more than 500 Å into the growing film. 12 Considering the total film thickness of 3000 Å the interface will have only a small influence on the measured properties of the whole film volume. Scanning electron microscopy of the Pr 0.5 Sr 0.5 MnO 3 films showed no trace of particles on the mirrorlike surfaces, while the average roughness of a 1 m 2 surface obtained with atomic force microscopy is 40 Å for a 3000 Å thick film.…”

Section: Sample Preparationmentioning

confidence: 99%

Magnetotransport in epitaxial thin films of the magnetic perovskitePr0.5Sr0.5
Wagner
¹
,
Metlushko
²
,
Trappeniers
³

et al. 1997
Phys. Rev. B
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Thin, c ជ -axis oriented films of the magnetic perovskite Pr 0.5 Sr 0.5 MnO 3 were prepared by dc-magnetron sputtering, structurally characterized by x-ray diffraction and their physical properties investigated by magnetization and electrical transport measurements. Ferromagnetic ordering appears in zero field at 263 K, followed by a second transition into an antiferromagnetic state at 160 K. The zero-field resistivity has a semiconducting behavior above the Curie and below the Néel temperature and is analyzed in the framework of Mott's variable range hopping concept. Quasimetallic behavior is observed within the ferromagnetic state, whose temperature range can be extended by applying an external magnetic field. The negative magnetoresistance effect increases systematically with decreasing temperature and reaches a value of 700% at 1.5 K in a field of 12 T. In the ferro-and antiferromagnetic phases, the field induced resistivity decrease scales with the Brillouin function, suggesting the existence of magnetically polarized regions with a total magnetic moment which is reduced upon entering the antiferromagnetic state.

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“…It should be pointed out that according to Rubin et al,31 the 2212 phase remains stable under annealing conditions of about 1 mbar O2 pressure at about 825 °C; therefore, CuO and (Sr,Ca)-Cu-0 secondary phases occurred in the studied films should not be produced by decomposition of the 2212 phase because the annealing conditions we used are in a favorable region. Rather, the secondary phases, as well as the very high n Bi2Sr2Can-iCun0>, phases, should be due to the post-annealing process because our previous TEM investigations on as-deposited 2212 thin films revealed only the perfect structure of the 2212 phase.…”

Section: A Formation Of the Secondary Phases And The High N Homologomentioning

confidence: 76%

Post-annealing induced defects and their influences on Bi₂Sr₂CaCu₂O_y superconducting thin films

Zhang

1995

J. Mater. Res.

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Defects in Bi2Sr2Can-iCu,,O}, superconducting thin films annealed in an oxygen atmosphere are examined by high-resolution electron microscopy (HREM). In addition to the majority 2212 (n = 2) phase, subsequent slabs of other homologous phases with n values up to n = 10 are found intergrown in the films. Large-angle tilt grain boundaries and various secondary phases such as CuO, S r -C u -0 oxides are formed in the films. The occurrence of these defects is attributed to an inhomogeneous Sr, Ca, and Cu distribution induced by the post-annealing. Superconducting transition temperature (Tc) is increased by the annealing under suitable conditions.

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Preparation and structural characterization of thin epitaxial Bi2Sr2CaCu2O8+δ films with Tc in the 90 K range

Cited by 55 publications

References 19 publications

Vortex-liquid entanglement inBi2Sr2CaCu2
Miu
¹
,
Jakob
²
,
Haibach
³

et al. 1998
Phys. Rev. B
Self Cite
25
2
11
0
View full text Add to dashboard Cite

Vortex-liquid entanglement inBi2Sr2CaCu2
Miu
¹
,
Jakob
²
,
Haibach
³

et al. 1998
Phys. Rev. B
Self Cite
25
2
11
0
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Magnetotransport in epitaxial thin films of the magnetic perovskitePr0.5Sr0.5
Wagner
¹
,
Metlushko
²
,
Trappeniers
³

et al. 1997
Phys. Rev. B
Self Cite
42
0
24
1
View full text Add to dashboard Cite

Post-annealing induced defects and their influences on Bi₂Sr₂CaCu₂O_y superconducting thin films

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Preparation and structural characterization of thin epitaxial Bi2Sr2CaCu2O8+δ films with Tc in the 90 K range

Cited by 55 publications

References 19 publications

Vortex-liquid entanglement inBi2Sr2CaCu2Miu1, Jakob2, Haibach3 et al. 1998Phys. Rev. BSelf Cite252110View full textAdd to dashboardCite

Vortex-liquid entanglement inBi2Sr2CaCu2Miu1, Jakob2, Haibach3 et al. 1998Phys. Rev. BSelf Cite252110View full textAdd to dashboardCite

Magnetotransport in epitaxial thin films of the magnetic perovskitePr0.5Sr0.5Wagner1, Metlushko2, Trappeniers3 et al. 1997Phys. Rev. BSelf Cite420241View full textAdd to dashboardCite

Post-annealing induced defects and their influences on Bi2Sr2CaCu2Oy superconducting thin films

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Vortex-liquid entanglement inBi2Sr2CaCu2
Miu
¹
,
Jakob
²
,
Haibach
³

et al. 1998
Phys. Rev. B
Self Cite
25
2
11
0
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Vortex-liquid entanglement inBi2Sr2CaCu2
Miu
¹
,
Jakob
²
,
Haibach
³

et al. 1998
Phys. Rev. B
Self Cite
25
2
11
0
View full text Add to dashboard Cite

Magnetotransport in epitaxial thin films of the magnetic perovskitePr0.5Sr0.5
Wagner
¹
,
Metlushko
²
,
Trappeniers
³

et al. 1997
Phys. Rev. B
Self Cite
42
0
24
1
View full text Add to dashboard Cite

Post-annealing induced defects and their influences on Bi₂Sr₂CaCu₂O_y superconducting thin films