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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic and transport properties of Na doped SrRuO3 and CaRuO3 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4821-4823 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic susceptibility χ(T) (2≤T≤400 K) and electrical resistivity ρ(T) (2≤T≤300 K) of undoped and Na doped SrRuO3 and CaRuO3 single crystals were measured. These two perovskites are orthorhombic with space group Pbnm. While both of the undoped systems exhibit metallic conductivity, SrRuO3 is ferromagnetic with Tc≤160 K, but CaRuO3 is paramagnetic. When a small concentration of Na (≤12%) replaces Sr in the structure, SrRuO3 becomes an insulator with a depressed ferromagnetic response. In contrast, Na doped CaRuO3 (≤5%) remains metallic with the appearance of antiferromagnetism below 70 K. The dramatic changes in magnetic and transport properties resulting from Na replacement of Sr and Ca reflects the very subtle differences driving the magnetism in SrRuO3 and CaRuO3. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361619
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Pr, Tb, and Zn doping into YBa2Cu3O7 on magnetoresistivity and magnetic phase boundaries : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5876-5878 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transverse AB-plane magnetoresistivity ρAB (C axis (parallel)H) of (Y1−XPrX)Ba2Cu3O7−δ and YBa2(Cu1−XZnX)3O7−δ thin films and (Y1−XTbX)Ba2Cu3O7−δ thin films and single crystals has been measured as a function of 0.0〈X〈XC, 2 K〈T〈300 K, and 0 T〈H〈20 T. Mean-field upper critical field HC2 and irreversibility field HI phase boundaries have been determined and are discussed in terms of proposed theories. Tb doping of YBa2Cu3O7 reflects an enhanced pinning or "stiffening'' of the vortex system without apparent alteration to TC or the slope of the mean-field normal phase-mixed phase boundary line, dHC2/dT||T=Tc. However, Pr and Zn doping of YBa2Cu3O7 tends to depress both TC and dHC2/dT||T=Tc and shows a "softening'' of the vortex system. This behavior may be understood in terms of the magnitude of the superconducting pair coherence length, which is controlled by doping, and the divergence of the vortex-glass correlation length as it relates to flux line coupling of vortices in the CuO2 planes. These systems are compared with other high TC superconducting systems which possess similar phase boundary properties. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362158
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of a high Tc superconductivity related system Y1−xPrxBa2Fe3O8 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6001-6003 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We studied Pr substitution for Y in a 123 high Tc superconductor related system, Y1−xPrxBa2Fe3O8 using of x-ray diffraction, magnetization, and 57Fe transmission Mössbauer spectroscopy. The Fe sublattices are magnetically ordered through the whole system. The Pr substitution, however, suppressed the Fe ordering temperature. The low temperature susceptibility across the system increases with increased Pr concentration x, and an additional antiferromagnetic ordering at 24 K is observed for x=1, indicating a possible Pr ordering. The averaged magnetic hyperfine field at Fe sites measured at 15 K is also reduced as x increases. The dramatic effect of Pr substitution for Y in this system, which is not observed in studies of Y substitution by other rare-earth elements, is interpreted as the effect of the hybridization between the Pr 4-f electrons and the electrons in the Fe(2)O2 layers, similar to the Pr hybridization in Y1−xPrxBa2Cu3O7−y system. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361894
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  • 4
    Electronic Resource
    Electronic Resource
    Growth of {100} textured diamond films by the addition of nitrogen (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1357-1364 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Localized {100} fiber textured diamond films were grown by addition of 20–200 ppm nitrogen into the gas phase during hot-filament chemical-vapor deposition (CVD). Cathodoluminescence indicates the presence of the nitrogen-vacancy system in the {100} textured diamond, whereas a blue "band A'' luminescence is normally observed in diamond films grown without nitrogen addition. The results demonstrate that the nature of the substrates used for growth has no appreciable influence on the {100} texture, which implies that this fiber texture is obtained by competitive growth and selection of facets. The interaction of nitrogen with the {100} surface is a highly important factor in this process. Homoepitaxial growth shows that the addition of a small amount of nitrogen greatly enhances the growth rate of the {100} faces, making 〈100〉 the fastest growth direction in comparison with the 〈110〉 and 〈111〉 directions. This is attributed to breaking of a part of the dimers on the (2×1) reconstructed {100} surface by nitrogen compounds. The {100} texture in narrow, ring-shaped areas on diamond layers grown by the flame technique can also be attributed to the occurrence of a certain amount of nitrogen in the gas phase. It is demonstrated that the flame grown polycrystalline diamond layers have morphologies and cathodoluminescence features that are consistent with those observed in the hot-filament CVD diamond films grown with the addition of nitrogen. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361033
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  • 5
    Electronic Resource
    Electronic Resource
    Unusual transport and magnetic properties of Tb-doped YBa2Cu3O7 single crystals and epitaxial thin films : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6328-6330 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical resistivity ρ(T) and magnetic susceptibility χ(T,H) (1.8≤T≤350 K and 0≤H≤5.5 T) have been measured on single crystals and epitaxial thin films of Y1−xTbxBa2Cu3O7. The Tc is 92 K and irrespective of Tb doping up to x=0.50. For T(approximately-greater-than)Tc, ρ(T) has a linear dependence, i.e., ρ(T)≈A+BT, with the reduced resistivity ρ(T)/ρ(250 K) for x=0.10, 0.25, and 0.50, being independent of Tb doping. The results of magnetic susceptibility along with the computation of effective moment of Tb in the presence of crystal electric fields (CEF) tend to suggest that the Tb is mixed valent. The insensitivity of Tc to the Tb doping and the possibility that Tb may be mixed valent are in sharp contrast to the case of Pr and Ce doping which have been shown to be very deleterious to superconductivity. The magnetic susceptibility χ(T) is extremely anisotropic, and this anisotropy cannot be explained by simple models with CEF effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355389
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  • 6
    Electronic Resource
    Electronic Resource
    Anomalous low dimensional system: Study of magnetism and electrical conductivity in Na2Ru4O9−δ : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4567-4569 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic susceptibility χ(parallel)(H(parallel)b), χ⊥(H⊥b) (2≤T≤700 K) and electrical resistivity ρ(T) (2≤T≤300 K) of single crystal Na2Ru4O9−δ (δ≥0) with various oxygen content were measured. The crystal structure of this compound is monoclinic with single, double, and triple chains along the b axis. The most striking feature of this compound is the drastically large anisotropy reflected in the resistivity which exhibits metallic behavior along chains and semiconducting behavior perpendicular to the chains. The resistivity ratio for these two directions (ρ⊥/ρ(parallel)) is larger than 105. This ratio is exceptionally large, indicating that the anisotropy of the bandwidth is substantial. It is remarkable that, after reduction of oxygen content in the system, the magnetic susceptibility undergoes a drastic change, whereas the electrical resistivity along the conducting chains is altered only slightly. It is argued that the different sensitivity to oxygen content reflected in magnetic and transport properties may be attributed to the complexity of the crystal structure. The striking observations presented here may suggest a one-dimensional system that possesses unique physical properties. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361727
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  • 7
    Electronic Resource
    Electronic Resource
    Homoepitaxial diamond films codoped with phosphorus and nitrogen by chemical-vapor deposition (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 3125-3131 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Homoepitaxial diamond films codoped with phosphorus and nitrogen have been grown on natural diamond substrates using phosphine and nitrogen as doping sources by hot-filament chemical-vapor deposition. The experiments show that the incorporation of nitrogen enhances both the phosphorus incorporation and the film growth rate. The former is attributed to the local lattice dilatation caused by nitrogen, while the latter can be explained by defects induced on the surface of diamond by nitrogen or by a change in gaseous composition. The highest concentrations of phosphorus and nitrogen in the epitaxial films are approximately 3×1019 and 6×1019 atoms/cm3, respectively, determined by secondary-ion-mass spectrometry; however, these epilayers are highly resistive. Furthermore, cathodoluminescence and photoluminescence studies show that despite the variety of luminescence features related to nitrogen, no indication of phosphorus induced luminescence is found in the infrared to visible range. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359998
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  • 8
    Electronic Resource
    Electronic Resource
    Itinerant to localized electron transition in ferromagnetic (Ca, Sr)1−xNaxRuO3 (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6223-6225 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: SrRuO3 is an itinerant ferromagnet with TC=165 K and CaRuO3 is a metallic paramagnet down to at least 30 mK. These materials are known to be narrow d-band metals, the physical properties of which are highly sensitive to small perturbations such as chemical doping. In this article, we report results of resistivity, specific heat, and magnetic susceptibility measurements on Na doped SrRuO3 and CaRuO3. Resistivity measurements show a change from metallic to nonmetallic behavior for Na concentration of 12% with the ferromagnetic ordering temperature depressed in Sr1−xNaxRuO3. The nonmetallic behavior in the x=0.12 sample is supported by specific heat measurements which are suggestive of a partial opening of an energy gap and brings into question the role of itineracy in the magnetic ground state. Ca1−xNaxRuO3, with x=0.00, 0.05, and 0.09, remains metallic and shows no evidence of long range magnetic order for all x. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370228
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  • 9
    Electronic Resource
    Electronic Resource
    Thermodynamic and magnetic properties of the tetravalent rare-earth perovskite system BaPrO3 : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6332-6334 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the magnetic susceptibility χ(T) and heat capacity C(T), the temperature and field dependence of the magnetization M(T,H), and neutron diffraction have been measured in the tetravalent perovskite system BaPrO3. A clear anomaly, observed in C(T), χ(T), and neutron scattering data at 11.7 K is attributed to antiferromagnetic alignment of Pr. Magnetization indicates that this ordering is insensitive to magnetic fields with TN being independent of H for H〈12 T. High-field isotherms show an upward kink in slope at 12.7 T independent of temperature for T〈9.5 K, suggestive of a spin reorientation transition. 119Sn Mössbauer data for BaPr0.95Sn0.05O3 indicate a quadrupole splitting at 300 K that broadens below TN due to a hyperfine field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349959
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  • 10
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of perovskite ARuO3 (A=Ca, Sr, and Ba) single crystals : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4978-4980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic susceptibility, transport properties (including magnetoresistivity and the Hall effect), and specific heat of perovskite ARuO3 (A=Ca, Sr, and Ba) single crystals were measured. These compounds, particularly CaRuO3 (paramagnetic conductor) and SrRuO3 (ferromagnetic conductor) are believed to have a narrow π* band and their thermodynamic properties depend in an extremely sensitive way on the degree of the band filling and band width. This study reveals that the π* bandwidth of these compounds is largely determined by the ionic radii of the alkaline-earth A cations, i.e., the interaction between A s and O 2p orbitals and the electron correlation becomes progressively stronger in the series BaRuO3, SrRuO3, and CaRuO3. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365018
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