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  • American Institute of Physics (AIP)  (187)
  • 2020-2020
  • 1995-1999  (90)
  • 1990-1994  (69)
  • 1985-1989  (28)
  • 1975-1979
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic transitions in Pr2NiO4 single crystal : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6329-6331 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of a stoichiometric Pr2NiO4 single crystal have been examined by means of the temperature dependence of the complex ac susceptibility and the isothermal magnetization in fields up to 200 kOe at T=4.2 K. Three separate phases have been identified and their anisotropic character has been analyzed. A collinear antiferromagnetic phase appears first between TN = 325 K and Tc1 = 115 K, where the Pr ions are polarized by an internal magnetic field. At Tc1 a first modification of the magnetic structure occurs in parallel with a structural phase transition (Bmab to P42/ncm). This magnetic transition has a first-order character and involves both the out-of-plane and the in-plane spin components (magnetic modes gx and gxcyfz, respectively). A second magnetic transition having also a first-order character is also clearly identified at Tc2 = 90 K which corresponds to a spin reorientation process (gxcyfz to cxgyaz magnetic modes). It should be noted as well that the out-of-phase component of χac shows a peak around 30 K which reflects the coexistence of both magnetic configurations in a wide temperature interval. Finally, two field-induced transitions have been observed at 4.2 K when the field is directed along the c axis. We propose that the high-field anomaly arises from a metamagnetic transition of the weak ferromagnetic component, similarly to La2CuO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349958
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  • 2
    Electronic Resource
    Electronic Resource
    A spectrometer for the measurement of reflectance-difference spectra (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2147-2152 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We describe a spectrometer (visible-ultraviolet photon energy range) for the measurement of reflectance-difference spectra of cubic semiconductors. The spectrometer employs a photoelastic modulator to modulate the polarization of the light incident on the sample and allows for a simple procedure to correct the measured spectra for parasitic components associated with such modulation. The instrument reported has a higher throughput than more conventional setups. To illustrate the spectrometer performance we report on reflectance-difference spectra of (001) oriented GaAs single crystals doped with silicon donors at a level of 1018/cm3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143952
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of a novel molecular-based magnetic compound containing a copper (II) monomer, a copper (II) dimer, and a ladder-like copper (II) chain (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 1918-1921 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent results concerning synthetic, structural, and magnetic work on 3,4,9,10-perylenetetracarboxylic acid complexes of copper (II) are discussed. To date, the Cu(II)/PTCA/dien system has yielded two compositionally different crystalline products. Compound 1, [Cu3(dien)3(PTCA)(H2O)3](ClO4)22H2O represents the extremely rare case of three different molecular complexes of Cu(II), bound to the same ligands but with different stoichiometries, in the same compound. The magnetic lattice is comprised of three molecular substructures: complex 1a is a monomeric cation, [Cu(dien)(H2O)2]2+; complex 1b is a charge-neutral dimer, [Cu2(dien)2-(PTCA)(H2O)2]; and complex 1c a charge-neutral, infinite ladder-like chain structure, ∞1[Cu2(dien)2(PTCA)]n. Single crystal x-ray analysis of compound 2, [Cu2(dien)2(PTCA)(H2O)2]12H2O, reveals its structure simply consists of isolated, neutral dimers similar in structure to complex 1b. Magnetic susceptibility data in the temperature range 1.7–300 K shows the dimeric unit in 2 to be a weakly exchange-coupled antiferromagnetic dimer (−0.6 cm−1) and suggests that exchange interactions are indeed propagated through the PTCA anion over a Cu.....Cu separation of 15.7 A(ring). This result, in addition to the expected Curie paramagnetism of monomer 1a, affords the ladder-like chain 1c to be characterized as a chain of antiferromagnetically exchange-coupled ferromagnetic dimers (+12 cm−1). Long range ordering is not observed down to 1.7 K. Compound 1 is the first example of a molecular-based magnetic material that contains three different homonuclear magnetic molecules; a monomer, a dimer, and a ladder-like chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354774
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis, crystal structure, and magnetic properties, of a Cu(II) solid state compound derived from the 3,4,9,10-perylenetetracarboxylate anion and diethylenetriammine (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5397-5397 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Several strategies have been used to develop novel magnetic materials. One of these is the simultaneous use of at least two different ligands, one an oxygen donor and the other a nitrogen donor. With this approach, using the optically interesting oxygen donor, 3,4,9,10-perylenetetracarboxylate anion (petca), and the tridentate nitrogen donor ligand, diethylenetriamine (dien), we recently reported1 the synthesis of the solid state Cu(II) compound, [Cu5(dien)5(petca)2H2O4] (ClO4)2⋅2H2O (1). This compound contains three different copper species, a chain [Cu2 (dien)2(petca)n, a dimer [Cu2(dien)2(petca)(H2O)2] and a monomer [Cu(dien)(H2O)2] and several exchange pathways. We wish to report, that the dimeric units in 1 have been isolated. The structure of the compound [Cu2(dien)2(petca)H2O)2]⋅13H2O (2), has been determined by an x-ray single-crystal diffraction study. Two different dimers are present in the unit cell: isolated dimer units, surrounded by water molecules; and dimers connected through hydrogen bonds in a way that resembles the chains in 1. In both cases, the Cu(II) ion is coordinated to one oxygen from the petca anion, the three nitrogen atoms of the dien, and a water molecule, in a nearly square planar geometry. The magnetic properties of this compound relate to these structural features.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353693
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  • 5
    Electronic Resource
    Electronic Resource
    Cation distribution and magnetization of BaFe12−2xCoxSnxO19 (x=0.9,1.28) single crystals (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4608-4614 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution of Sn4+ cations within the five crystallographic sites of the magnetoplumbite (M) -like compound BaFe12−2xCoxSnxO19 has been analyzed using single-crystal x-ray-diffraction data. The species Fe3+ and Co2+ cannot be distinguished using x rays because of their very similar atomic numbers; however, the calculation of the apparent valencies for the different sites allows an insight into the Co2+ cation segregation. The use of previous data from neutron powder diffraction allows a precise picture of the cation distribution, which indicates a pronounced site selectivity for both Sn4+ and Co2+ cations. The Sn4+ cations prefer the 4f2 sites and to a much lower extent the 12k sites, while they do not enter the octahedral 2a sites at all. Co2+ cations are distributed among tetrahedral and octahedral sites displaying a clear preference for the tetrahedral 4f1 sites. Magnetic measurements indicate that the compound still exhibits uniaxial anisotropy with the easy direction parallel to the c axis. Nevertheless, the magnetic structure shows a considerable degree of noncolinearity. A strong reduction of the magnetic anisotropy regarding that of the undoped compound is also detected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352359
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  • 6
    Electronic Resource
    Electronic Resource
    Ion channeling study of strained ErAs films on (001) GaAs (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4890-4893 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial thin films of ErAs were grown by molecular beam epitaxy on (100) GaAs. The lattice mismatch induced strain and subsequent lattice relaxation were studied using Rutherford backscattering spectrometry and ion channeling. The channeling results showed a strong thickness dependence for the backscattered minimum yield. Channeled angular scans showed the thin films to be fully strained up to 15 nm in thickness. Thicker films were found to relax with full relaxation not being reached until the 100-nm thickness range. The thick films were found to tilt up to 0.26° with respect to the crystal axes of the substrate. The tilt is apparently a result of the strain relaxation mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349032
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  • 7
    Electronic Resource
    Electronic Resource
    Tin diffusion and segregation in GaAs processed with a pulsed ruby laser (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3832-3837 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Tin-diffused GaAs layer samples, with mean concentrations larger than 1019 cm−3, were obtained by irradiating with a ruby laser GaAs substrates covered with thin tin layers. Mobilities between 100 and 200 cm2/V s were obtained. Both carrier concentration and mobility decrease with increasing energy density. Strong segregation effects were observed in the samples processed with large energy densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346267
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of thin CdS films grown by the gradient recrystallization and growth technique (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1375-1377 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For the first time the growth of polycrystalline CdS films by the gradient recrystallization and growth technique on silicon, quartz, and glass substrates is reported. X-ray diffraction, photoluminescence, scanning electron microscopy, and microprobe studies were used for their characterization. This preliminary study shows that this technique is suitable for growing CdS films with larger grain sizes than those obtained by conventional evaporation methods. The photoluminescence studies show that the emission spectrum of the films deposited on silicon is comparable to single-crystal CdS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346689
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  • 9
    Electronic Resource
    Electronic Resource
    Two-dimensional damage distribution induced by ion implantation in Si under arbitrarily shaped mask edges: Simulations and cross-sectional transmission electron microscopy observations (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 5117-5123 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A method is presented to calculate two-dimensional defect distributions induced by ion implantation through openings in a masking layer. It is shown that a realistic description of this model requires depth-dependent lateral standard deviations to describe the dopant and the damage point response functions. Further refinements of the theory include arbitrary shapes for the mask edges and different materials in the masking layer and in the substrate. Cross-sectional electron microscopy observations have been carried out to visualize the two-dimensional extension of amorphous layers created by As implantation in silicon for different mask edge angles. It is shown that the theory fits well the cross-sectional transmission electron microscopy observations. More generally, this study shows that for abrupt mask edges, the lateral extension of the two-dimensional defect profile beneath the mask edge is directly governed by scattering of the ions and of the subsequent recoil atoms and, as a direct consequence, by the lateral standard deviation of the damage point response function. For tapered mask edges, however, the contribution of ions that pass through the mask edge region before damaging the substrate may be very high with respect to scattering effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352041
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  • 10
    Electronic Resource
    Electronic Resource
    Transport critical current densities of partially aligned bulk samples of YBa2Cu3O7−x superconductors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4178-4182 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Temperature and magnetic field dependence of critical current densities (Jc) of partially oriented bulk YBa2Cu3O7−x samples are presented. A series of partially oriented samples has been fabricated by repeating the steps of the solid-state reaction method. X ray and Raman studies detect the orientation of the grains on the surface and in the bulk of the samples. Jc increases with the degree of alignment of the microcrystals, up to a factor of three. The effect of partial bulk-preferred orientation on the critical current anisotropy is also studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346232
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