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  • 1
    Electronic Resource
    Electronic Resource
    Role of lattice distortions in the transport property of R0.7Me0.3MnO3 (R=Pr,Nd,La and Me=Ba,Sr,Ca) (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4552-4552 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There are different models which to try to explain the transport properties of the manganese oxides in terms of magnetic polarons, Zener double exchange and Jahn-Teller distortions of the lattice which is temperature dependent. Using Rutherford backscattering techniques (2–3 MeV He ions) we are measuring the presence of lattice distortions by studying the angular scans in the channeling mode. The angular widths (FWHM) can be used to extract both dynamic and static displacements of the atoms from their equilibrium sites. The technique is extremely powerful in the sense that local uncorrected displacements as small as 0.01 A(ring) from the equilibrium position can be detected. The extraction of the physics from the data is relatively straight forward compared to other techniques such as XRD or neturon scattering. Using a variable temperature backscattering system at our center (one of three or four systems around the world) the angular width (FWHM) is found to exhibit a dramatic change with temperature increasing with decreasing temperature showing a possible correlation with both the transport and magnetic properties. The results suggest a decrease in the lattice disorder with reduced temperature far in excess of what one would predict on the basis of a simple Debye behavior. The reduction in the lattice disorder correlates very well with the resistance vs temperature dependence. A variety of manganese oxide epitaxial thin films grown by pulsed laser deposition have been studied and the data suggests a role for structural distortions in any mechanism to explain the transport properties of these materials. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361720
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  • 2
    Electronic Resource
    Electronic Resource
    Response to an electric field of Nd0.7Sr0.3MnO3 films in a MOSFET configuration (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4545-4545 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of an electric field on GMR oxide films was studied in a MOSFET configuration where the gate dielectric was a layer of SrTiO3 epitaxially grown on an underlying layer of the manganate which served as the source/drain. The response of the manganate channel was studied for different gate voltages. The following significant features were observed. The peak resistance temperature shifted to lower temperature for both polarities of the field. The resistance change varied quadratically with the field indicating the dominance of strain or polarization effects. In dynamical studies of the system using the gate voltage as an excitation the system showed anomalous slowing down near the peak of the resistivity. These results are understood on the basis of a stress effect on the film due to electro-elastic effects in the SrTiO3 layer, which introduces a tensile stress in the manganate layer upon the application of a gate voltage. The anomalous slowing down of the system near the ferromagnetic phase transition suggests a strong coupling between the spins, transport and structural distortions in the system. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361718
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of epitaxial La0.7Ba0.3MnO3 structures using ferromagnetic resonance (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 2334-2338 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have compared a single layer of La0.7Ba0.3MnO3 and a trilayer structure of SrTiO3/La0.7Ba0.3MnO3/SrTiO3, both grown epitaxially on a LaAlO3 substrate, using information obtained by ferromagnetic resonance (FMR). The trilayer samples have a more uniform magnetization and are not susceptible to environmental degradation. This may be due to the strain relief that the buffer SrTiO3 layer provides for the La0.7Ba0.3MnO3 layer. We have also studied the magnetic homogeneity of the trilayer structure as a function of the deposition temperature. The perpendicular FMR linewidth, Γ⊥, shows a clear window in the deposition temperature where the linewidth is 〈50 Oe. However, the parallel linewidth, Γ(parallel), is nearly ten times larger than Γ⊥ with only a weak dependence on the deposition temperature. This broadening of the parallel linewidth compared to the perpendicular linewidth can be explained by invoking a local unidirectional anisotropy in the plane of the film. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363066
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  • 4
    Electronic Resource
    Electronic Resource
    Crystalline to amorphous transformation in GaAs during Kr ion bombardment: A study of elastic behavior (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 152-155 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A marked softening in the shear elastic properties of GaAs following 1.5-MeV Kr ion irradiation is observed. Ion channeling and Raman scattering are used to monitor the accumulation of damage, which for 1.5-MeV incident energy extends to a depth of ∼8000 A(ring). Both techniques show that the sample is amorphized by a dose of 2×1014 ions/cm2. Brillouin scattering reveals that a shear elastic modulus of this near-surface irradiated region decreases by 43% as the material transforms from crystalline to amorphous. The observed results are discussed and compared with similar measurements on Si and intermetallic compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343895
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructural properties of (Ba, Sr)TiO3 films fabricated from BaF2/SrF2/TiO2 amorphous multilayers using the combinatorial precursor method (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 2474-2478 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the microstructure of (Ba, Sr)TiO3 films fabricated from BaF2/SrF2/TiO2 amorphous multilayers. Rutherford backscattering spectroscopy and x-ray diffraction studies show that a controlled thermal treatment can interdiffuse the multilayers so as to create predominantly single-phase epitaxial (Ba, Sr)TiO3 films. A high resolution cross-sectional transmission electron microscopy investigation of the processed films shows that they consist of large epitaxial grains of (Ba, Sr)TiO3 with atomically sharp interfaces with the LaAlO3 substrates. In addition, we have identified regions where polycrystalline and transient phases exist in small pockets in the film matrix. The results here indicate that the combinatorial thin-film synthesis using precursors can produce (Ba, Sr)TiO3 films in combinatorial libraries which exhibit properties similar to those films made by conventional techniques. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1388563
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  • 6
    Electronic Resource
    Electronic Resource
    Transient filaments formation by nonlinear kinetic Alfvén waves and its effect on solar wind turbulence and coronal heating (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3759-3765 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear dynamical equation for the propagation of kinetic Alfvén waves has been derived in two dimensions using the two-fluid model of the plasma and by taking the adiabatic response for the background density in the presence of nonlinear electron heating and the ponderomotive force. Dynamically evolving filamentary structures are predicted. The effect of these filaments on solar wind turbulence and coronal heating has also been pointed out. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1385172
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of pump depletion and self-focusing on stimulated Brillouin scattering process in laser-plasma interactions (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 927-931 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper presents the study of the stimulated Brillouin scattering (SBS) process when the self-focusing effects of the pump and scattered laser beams are taken into account in three dimensions within the paraxial ray approximations. Integrated SBS reflectivity is found to exhibit a maximum value at an optimum SBS gain. The reflectivity with pump depletion is less than without pump depletion and several orders of magnitude lower than the usual three-wave interaction case. The effect of the statistical distribution of the laser beam on the SBS reflectivity has also been discussed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873332
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  • 8
    Electronic Resource
    Electronic Resource
    Excitation of electron Bernstein and ion Bernstein waves by extraordinary electromagnetic pump: Kinetic theory (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 522-527 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the present paper, parametric decay instability of an extraordinary electromagnetic (EM) wave into a high-frequency electron Bernstein wave and a low-frequency ion Bernstein wave is studied. The guiding center formalism is followed to obtain the coupling coefficients including kinetic effects. The momentum space integrals in the coupling coefficients are solved in the dipole approximation of the pump wave and in the limits, k⊥ρe〈1 for electron Bernstein wave and k⊥ρi〈1 for ion Bernstein wave. Analytical expressions for homogeneous growth rate and threshold are given explicitly. Applications of the present investigation are pointed out to ionospheric modification experiment and fusion plasmas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870796
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  • 9
    Electronic Resource
    Electronic Resource
    Relativistic self-focusing and its effect on stimulated Raman and stimulated Brillouin scattering in laser plasma interaction (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3419-3426 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper presents the effect of relativistic electron mass variation on a very high-power laser beam propagating in unmagnetized plasma. By choosing the laser beam and plasma parameters, the laser beam could be propagated without convergence or divergence (self-trapped mode). When the laser power exceeds the critical power, the laser beam can undergo periodic self-focusing due to relativistic nonlinearity. The stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) processes in the presence of this relativistic nonlinearity are discussed. The effect of finite laser beam size and that of scattered beam and relativistic self-focusing of the pump laser beam on SRS and SBS back-reflectivity have also been studied, including pump depletion. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1377048
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  • 10
    Electronic Resource
    Electronic Resource
    Some parametric instabilities which arise during ion-Bernstein wave heating in fusion plasmas (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2397-2403 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In the present paper, the parametric decay instability of an ion-Bernstein wave (ωci〈ω0(approximately-less-than)2ωci) into a scattered ion-Bernstein wave and a low-frequency wave (either an ion-acoustic wave or a kinetic-Alfvén wave) has been examined. It has been demonstrated that this parametric process may be one of the possible sources of ion heating in tokamaks. In addition to this, the possibility of oscillating two-stream instability (OTSI) of an ion-Bernstein wave (ωci〈ω0(approximately-less-than)2ωci) or a cold plasma ion-Bernstein wave (ω0(approximately-less-than)ωci) has also been discussed. The explicit expressions for threshold and convective threshold of the decay processes are given. For OTSI, the expressions for maximum growth rate have also been given explicitly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859174
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