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Grain-boundary room-temperature low-field magnetoresistance in Sr2FeMoO6 films (2000)

Yin, H. Q. ; Zhou, J.-S. ; Dass, R. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 6761-6763

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Thin films of (001)-oriented Sr2FeMoO6 have been epitaxially deposited or LaAlO3 and SrTiO3 (001) substrates by pulsed laser deposition. The deposition conditions were optimized. Single-phase Sr2FeMoO6 was obtained in 100 mTorr 99.999% Ar gas at 825 °C. Transport and magnetic data showed a metallic temperature dependence and a saturation magnetization Ms at 10 K of 3.2μB/f.u. However, the Curie temperature TC(approximate)380 K was reduced from 415 K found for tetragonal polycrystalline best ceramics, which lowers Ms at 300 K in the thin films to 1.5μB/f.u. compared to 2.2μB/f.u. in the ceramics. A low remanence was attributed to the presence of antiphase boundaries. A Wheatstone bridge arrangement straddling a bicrystal boundary was used to verify that spin-dependent electron transfer through a grain boundary and not an antiphase boundary is responsible for the low-field magnetoresistance found in polycrystalline samples below TC. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.372833

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Digitale Medien

Effect of tolerance factor and local distortion on magnetic properties of the perovskite manganites (1999)

Zhou, J. P. ; McDevitt, J. T.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 75 (1999), S. 1146-1148

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The substitutions of rare earths for La on the magnetic properties of the perovskites La0.7−xRxA0.3MnO3 (0〈x〈0.7), R=Pr or Gd and A=Ca, Sr, or Ba have shown that small substitution of Pr slightly increases the coercive field Hc and magnetization M, and strongly improves the magnetoresistance (MR) while lowering Tc. On the other hand, the substitution of Gd lowers Hc, M and Tc, however, increases MR of the system La0.7−xGdxSr0.3MnO3 at temperature 〈Tc. Large differences in the A-site ionic radii rA of the AMnO3 perovskites proved detrimental. The optimal composition has been discussed for the half-metallic ferromagnet of a spin-switch device based on the manganese oxides. © 1999 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.124624

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Intra- versus intergranular low-field magnetoresistance of Sr2FeMoO6 thin films (1999)

Yin, H. Q. ; Zhou, J.-S. ; Zhou, J.-P. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 75 (1999), S. 2812-2814

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Thin films of (001)-oriented Sr2FeMoO6 have been epitaxially deposited on LaAlO3 and SrTiO3 (001) substrates. Comparison of their transport and magnetic properties with those of polycrystalline ceramic samples shows a metallic versus semiconductor temperature dependence and a saturation magnetization Ms at 10 K of 3.2 μB/f.u. in the film as against 3.0 for a tetragonal polycrystalline sample. However, the Curie temperature TC(approximate)389 K is reduced from 415 K found for the tetragonal ceramic, which lowers Ms at 300 K in the thin films to 2.0 μB/f.u. compared to 2.2 μB/f.u. in the ceramics. A Wheatstone bridge arrangement straddling a bicrystal boundary has been used to verify that spin-dependent electron transfer through a grain boundary is responsible for the low-field magnetoresistance found in polycrystalline samples below TC. © 1999 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.125158

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Physical and chemical properties of (Y1−xCax)(Ba2−xLax)Cu3O7−δ (1995)

Zhou, J. P. ; Zhou, J. -S. ; Goodenoug, J. B. ; [weitere]

Springer

Journal of superconductivity 8 (1995), S. 651-652

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ISSN: 1572-9605

Schlagwort(e): High-Tc superconductor ; chain conduction ; thermopower ; chemical stability

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik

Notizen: Abstract The metallic conductivity of both the CuO2 sheets and the CuOx chains of YBa2Cu3O7−δ has been established. We have used double doping in (Y1−xCax)(Ba2−xLax)Cu3O7−δ to destroy the integrity of the CuO1−δ chains while keeping constant the total oxidation state of the Cu-O array. A break-up of the chain segments allows us to establish the temperature dependence of the Seebeck coefficient, α(T), due to the CuO2 sheets and, by difference, that of the CuO1−δ chains in YBa2Cu3O7−δ. We also show that double doping enhances significantly the chemical stability of the superconductive phase. The origin of the chemical stability and of the behavior of α(T) is interpreted.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00727461

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