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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic properties of La2Cu1−xMxO4 with M=Zn and Ni (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4902-4902 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature and concentration dependence of the magnetic susceptibililty of La2Cu1−xMxO4 with M=Zn and Ni and 0≤x〈0.10 has been measured for 1.8≤T≤400 K. The 3D antiferromagnetic order in La2CuO4 is highly sensitive to doping, introducing additional holes by increasing x in La2−xSrxCuO4 from 0 to 0.02 suppresses the TN from 240 to 0 K. The Néel temperature of La2Cu1−xZnxO4 with x=0.0, 0.01, 0.02, 0.04, 0.06, 0.08, 0.10 has been determined by using the temperature derivative of the magnetic susceptibility measured on random polycrystalline and aligned polycrystalline samples. TN is depressed rapid with Zn doping with an initial depression rate dTN/dxZn≈20 K. Similar studies of Ni-doped La2CuO4 will be presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348219
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic and thermodynamic properties of nonsuperconducting (Y,Pr)Ba2Cu3O6 : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5376-5378 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The concentration dependence of the room-temperature lattice constants and the concentration and temperature dependence of the specific heat C(T) and the magnetic susceptibility have been measured on the tetragonal, nonsuperconducting phase of Y1−xPrxBa2Cu3O6. The effective paramagnetic moment μeff is independent of x and has an average value of 2.7±0.2 μB. For PrBa2Cu3O6, the Néel temperature TN for Pr moment ordering is 10.5 K as compared to TN=17 K for the orthorhombic PrBa2Cu3O7 phase. The TN is depressed rapidly with Y doping in the oxygen-depleted compound and goes to zero at x≈0.4–0.5. At low temperatures and x≤0.5, C(T)/T vs T2 is nonlinear and shows a rapid decrease of C(T)/T indicative of strong magnetic correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348037
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  • 3
    Electronic Resource
    Electronic Resource
    The operation of a uniformly insulated extraction applied-B ion diode (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 2555-2561 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the first experimental results of a uniformly insulated extraction applied-B ion diode. The diode typically attained beam generating efficiencies of 70% at the time of peak beam power. This is a significant improvement over previous extraction applied-B ion diodes, demonstrating the importance of uniform insulation as suggested by theory [J. Appl. Phys. 59, 2685 (1986)]. Furthermore, we found that the beam current is nearly independent of the ion-emitting area down to a minimum area. At the minimum area, the beam current density was enhanced by 150 times the monopolar Child–Langmuir value. This data supports a recently proposed theory [Phys. Rev. Lett. 59, 2295 (1987)] that predicts large enhancements due to the electron diamagnetic effect on the virtual cathode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346479
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic structure of UPb3 and UIn3: A 119Sn Mössbauer study (abstract) : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4825-4825 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of Mössbauer spectra and magnetic susceptibility has been measured for U(In1−xSnx)3 and U(Pb1−xSnx)3. The low temperature 119Sn Mössbauer spectra of U(Pb1−xSnx)3 for 0.02≤x≤0.85 and U(In1−xSnx)3 for 0.02≤x≤0.5 show the existence of magnetic hyperfine field at the Sn site. The results for both systems indicate that the antiferromagnetic structure for the Pb- and In-rich pseudobinary alloys is not as previously reported based on interpretation of neutron diffraction data. A magnetic structure is proposed with a magnetic unit cell of (2a,2a,2a) (where a is the lattice constant of crystal unit cell) and the U magnetic moments alternating between the eight possible (1+,1+,1+) directions for both systems. The new structure is consistent with both neutron diffraction and Mössbauer results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348243
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  • 6
    Electronic Resource
    Electronic Resource
    U(Sn,Pb)3: A specific heat study of the magnetic-nonmagnetic transition (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4827-4829 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: USn3 is a highly enhanced paramagnet and close to a magnetic instability. Whereas UPb3 has an antiferromagnetic transition at 31 K and the 5f electrons appear to be more localized. Both USn3 and UPb3 crystallize in the Cu3Au structure and complete pseudobinary alloys can be prepared. The temperature dependence of the specific heat C(T) for 1.5≤T≤50 K and magnetic susceptibility χ(T) for 1.8≤T≤ 400 K has been measured on U(Sn1−xPbx)3 for 0≤x≤1.0. Both χ(T) and C(T) data indicate that the substitution of Sn for Pb in UPb3 (i.e., decreasing x) causes the Neel temperature TN to increase initially to 38 K for x≈0.7 then decrease with TN→0 for x=0.07. The electronlike contribution to C(T) as T→0 remains high in the magnetically ordered state with the electronic specific heat coefficient γ for UPb3 ≈173 mJ/mol K2. The magnetic entropy removal below TN for UPb3 is ∼2−3 J/mol K, i.e., is smaller than expected for a U3+ or U4+ free ions and even for U3+ with a doublet ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344750
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties of some tetravalent rare-earth perovskites : 35 th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4874-4876 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the magnetic susceptibility for 1.5〈T〈300 K, the field dependence of the magnetization M(H), for 0〈H〈23 T and 1.5〈T〈15 K, and the temperature dependence of the heat capacity C(T), for 5〈T〈95 K are reported for the insulating distorted-perovskite systems PrBaO3, TbBaO3, TbSrO3, and CeBaO3, and the pseudoternary system (Pr,Ce)BaO3. X-ray analysis at room temperature indicates single-phase structures for all materials. PrBaO3 shows magnetic ordering below TN=11.7 K, possibly due to a canted antiferromagnetic structure. TN is nearly independent of applied field up to about 12 T. High-field M(H) isotherms show a well-defined upward sloping kink at 12.7 T, which is independent of temperature for T〈9.5 K. This is indicative of a spin-reorientation transition. The pressure dependence of TN is negligible: dTN/dP〈0.1 K/kbar. TbBaO3 and TbSrO3 both show antiferromagnetic ordering, but with low- field hysteresis effects below 34 K. Clear C(T) anomalies at TN=11.7 and 34 K are seen for PrBaO3 and TbBaO3, respectively. CeBaO3 is paramagnetic, but shows no magnetic order down to 1.8 K, although M(H) is field dependent at 4.2 K. The results in the Pr-based system are compared with previous work in high-Tc-related Pr-based systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348209
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  • 8
    Electronic Resource
    Electronic Resource
    Wire-guided transport of intense ion beams (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 639-655 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Light ion inertial confinement fusion requires beam transport over distances of a few meters for isolation of the diode hardware from the target explosion and for power compression by time-of-flight bunching. This paper evaluates a wire-guided transport system that uses the azimuthal magnetic field, produced by a current driven through a thin wire, to radially confine the ion beam. Ion orbits are studied to determine the injection efficiency (i.e., the fraction of the beam which is transported) under various conditions. Some ions hit the wire because of too small angular momentum at injection; others hit the wire or are lost to large radius during transport because of chaotic orbit behavior induced by a small number of return-current wires close to the beam envelope. For a multimodular scheme (10–30 beams), individual transport system are packed around the target at some standoff distance. The fraction of the beam which is lost in this field-free standoff region is also evaluated under various conditions. The standoff efficiency is then combined with the injection efficiency to give the dependence of the total transport efficiency, ηt, on diode, focusing, transport, and standoff parameters. It is found that ηt can be as large as about 60% for parameter values which appear to be achievable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347344
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic ordering in (Y1−xPrx)Ba2Cu3O7 as evidenced by muon spin relaxation (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5061-5063 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the zero-field-muon-spin-relaxation (μSR) technique clear evidence has been found for antiferromagnetic ordering of Cu moments within the CuO planes of (Y1−xPrx)Ba2Cu3O7. The Néel temperatures are approximately 285, 220, 35, 30, and 20 K for x=1, 0.8, 0.6, 0.58, and 0.54, respectively. For x=0.50 we observe a fast-relaxing component of the muon polarization in addition to a long-time tail, reminiscent of spin-glass behavior. This region of the phase diagram (0.5≤x≤0.54) corresponds to the existence of both superconductivity and magnetism. The fully developed local magnetic field for x〉0.54 is found to be ∼16 mT, but decreases to ∼12 mT at T=17 K for the x=1 sample, presumably due to the onset of Pr-ion ordering. Magnetic ordering also occurs in PrBa2Cu3O6; the Néel temperature is ∼325 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344670
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  • 10
    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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