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  • 2000-2004  (11)
  • 1990-1994  (42)
  • 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
    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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  • 4
    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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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    High magnetic field research: Overview of facilities and science and technology opportunities (invited) (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6812-6812 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A number of specialized facilities have been developed or are under development throughout the world to support research at high magnetic fields in a broad range of science and technology areas. These facilities provide continuous magnetic fields up to 32–35 T and pulsed fields up to 50–70 T for tens of ms periods with fields beyond 100 T for several μs. During the last several years, new laboratories have been planned and are being developed within the United States and Japan with major expansions of facilities occurring in France, The Netherlands, and other countries. The National High Magnetic Field Laboratory, presently under construction in the United States, will include superconducting magnets (B≤20 T), resistive magnets (B≤25–35 T depending on bore and power), hybrid magnet (B≤45–50 T), and pulsed fields (B≤60–70 T for 100 ms, B≤50–70 T for 10–20 ms and B≤250 T for about 10 μs). These new facilities within the United States and elsewhere will expand the research opportunities at the extremes of parameter space, i.e., magnetic field, ultralow temperatures, and high pressures, for researchers in the life and condensed matter science areas. An overview of the facilities throughout the world will be presented along with a brief discussion of the science opportunities and recent results at the extremes of high magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356841
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic properties of an isolated ferromagnetic bond embedded in Heisenberg antiferromagnets : 38th Annual Conference ion Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6748-6750 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of an isolated ferromagnetic bond of coupling constant K embedded in a layered spin-1/2 Heisenberg antiferromagnet with interplane coupling strength J⊥=αJ(parallel) (0≤α≤1.0) have been studied using linear-spin-wave (LSW) theory. In the pure lattice, the sublattice magnetization 〈Szi〉 is 0.304 at α=0 and saturates to 0.422 at α=1.0. The spin correlations 〈SxiSxj〉 decrease with increasing α within the plane and increase along the interplane direction. The introduction of an isolated ferromagnetic bond into the host lattice tends to enhance 〈Szi〉 at lattice sites joining the bond as K approaches zero. Increasing K will drastically suppress 〈SxiSxj〉 across the bond. Whereas, 〈SxiSxj〉 is enhanced between the neighboring sites close to the impurity link resulting in the suppression of 〈Szi〉. This behavior persists for all α values. The LSW theory breaks down at a certain K value. Increasing α, the critical value of K extends to a larger number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356872
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