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17 May 2004

Volume 84, Issue 20, pp. 3957-4121

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Appl. Phys. Lett. 84, 4104 (2004); http://dx.doi.org/10.1063/1.1753068 (3 pages)

Tetsuya Akasaka, Toshio Nishida, Toshiki Makimoto, and Naoki Kobayashi
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Superconductivity in La-doped strontium titanate thin films

David Olaya, Feng Pan, Charles T. Rogers, and Jonn C. Price

Appl. Phys. Lett. 84, 4020 (2004); http://dx.doi.org/10.1063/1.1751213 (3 pages) | Cited 3 times

Online Publication Date: 5 May 2004

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We report on the superconductivity of lanthanum-doped SrTiO3 thin films grown by off-axis laser ablation on LaAlO3, SrTiO3, and NdGaO3 substrates in oxygen partial pressures ranging from 10−8 T to 21 mTorr. The La/Sr doping ratio of the ablation target was 1%. The resulting films have carrier densities measured in the range of 6.5–30×1019 cm−3 independent of temperature from room temperature to 4 K and low-temperature mobilities as high as 130 cm2/V s. Critical temperatures range between 356 down to about 48 mK depending on oxygen partial pressure during growth. Measurements of superconductive transitions in a magnetic field suggest a value of the electronic effective mass around 4.5 times the free electron mass. © 2004 American Institute of Physics.
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74.78.-w Superconducting films and low-dimensional structures
74.70.Dd Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)

Surface effects in Mn L3,2 x-ray absorption spectra from (Ga,Mn)As

K. W. Edmonds, N. R. S. Farley, R. P. Campion, C. T. Foxon, B. L. Gallagher, T. K. Johal, G. van der Laan, M. MacKenzie, J. N. Chapman, and E. Arenholz

Appl. Phys. Lett. 84, 4065 (2004); http://dx.doi.org/10.1063/1.1751619 (3 pages) | Cited 45 times

Online Publication Date: 5 May 2004

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We have identified a Mn-rich layer on the surface on (Ga,Mn)As thin films which significantly influences soft x-ray absorption measurements. The Mn L3,2 x-ray absorption spectra of the untreated films show a strong multiplet structure, consistent with earlier observations and characteristic of MnO. After removal of the surface layer, the multiplet structure is less pronounced and the spectrum is shifted to ∼0.5 eV lower photon energy. Comparison with calculated spectra imply a localized Mn ground state for the untreated sample and a hybridized ground state after etching. In addition, a large x-ray magnetic circular dichroism is observed at the Mn L3,2 edge in the etched film. These results may explain several peculiarities of previously reported x-ray absorption studies from (Ga,Mn)As. © 2004 American Institute of Physics.
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78.70.Dm X-ray absorption spectra
81.65.Cf Surface cleaning, etching, patterning
75.70.Ak Magnetic properties of monolayers and thin films

The normal-state resistivity of grain boundaries in YBa2Cu3O7−δ

J. H. T. Ransley, S. H. Mennema, K. G. Sandeman, G. Burnell, E. J. Tarte, J. E. Evetts, M. G. Blamire, J. I. Kye, and B. Oh

Appl. Phys. Lett. 84, 4089 (2004); http://dx.doi.org/10.1063/1.1753055 (3 pages) | Cited 7 times

Online Publication Date: 5 May 2004

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Using an optimized bridge geometry, we have been able to make accurate measurements of the properties of YBa2Cu3O7−δ grain boundaries above Tc. The results show a strong dependence of the change of resistance with temperature on grain boundary angle. Analysis of our results in the context of band bending at the boundary allows us to estimate the height of the potential barrier present at the grain boundary interface. © 2004 American Institute of Physics.
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61.72.Mm Grain and twin boundaries
74.25.F- Transport properties
74.62.Bf Effects of material synthesis, crystal structure, and chemical composition
74.72.-h Cuprate superconductors
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