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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic ordering of Pr in Pb2Sr2PrCu3O8 : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7124-7126 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic ordering of the Pr ions in Pb2Sr2PrCu3O8 has been studied using neutron-diffraction and ac-suspectibility measurements. An imperfect three-dimensional magnetic ordering of the Pr spins was observed at a temperature well below its Neel temperature of TN≈7 K. The magnetic intensities observed at T=1.4 K can be explained by assuming long-range order in the ab plane with short-range correlations, of correlation length ξc=20 A(ring), along the c axis and a moment directed along the c-axis direction. The magnetic ordering is 2D in nature, and the basic magnetic structure consists of nearest-neighbor spins that are aligned antiparallel along all three crystallographic directions. The magnetic transition is also evident in the ac-susceptibility versus temperature measurements, where a cusp that is typical of antiferromagnetic ordering is clearly observed, which matches the TN obtained by neutron diffraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358051
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  • 2
    Electronic Resource
    Electronic Resource
    Anomalous perpendicular magnetoanisotropy in Mn4N films on Si(100) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6582-6584 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferrimagnetic Mn4N films were deposited on Si (100) substrate by dc reactive magnetron sputtering from sintered Mn target. Highly (002) textured Mn4N ordered phase is formed in situ at studied substrate temperatures of 150–250 °C without further annealing. Anomalous perpendicular magnetoanisotropy exists in these face-centered cubic films with larger coercivity measured perpendicular to the film (2000–3000 Oe) than that parallel (1100–1300 Oe), as is the remanence. Coercivity in either direction decreases, while the saturation flux density (from 240 to 610 G) increases with increasing substrate temperature. The anomalous perpendicular magnetoanisotropy is attributed to (1) the stress-induced anisotropy due to in-plane tensile stress coupled with a reverse magnetostriction, and (2) the shape anisotropy due to columnar grain structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358200
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  • 3
    Electronic Resource
    Electronic Resource
    Systematic variation of TN(Pr) for the two-CuO2-layer cuprate m212 (m=1, 2, 3) systems : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5866-5868 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The systematic variation of anomalous Pr antiferromagnetic ordering temperature TN(Pr) for the two-CuO2-layer cuprate system MA2PrCu2Oy (M=Cu, Hg, Tl, Pb; A=Ba, Sr) was verified through the observation of a new Hg-1212 HgSr2PrCu2O6+δ tetragonal compound with a TN(Pr) of 6 K and a Pr—O bond length of 2.492 A(ring) between Pr and oxygen in the adjacent CuO2 layers. For the tetragonal/orthorhombic 1212 compounds including the PrBa2Cu3O7−y system, TN(Pr) was found to decrease monotonically with increasing Pr—O distance. The importance of Pr-O-Pr superexchange magnetic coupling is expected for all two-CuO2-layer MmA2PrCu2Oy m212-type (m=1, 2, 3) compounds. A similar Pr anomaly in the 2212-type system was first observed on the new tetragonal (Pb0.5Cu0.5)2(Ba0.5Sr0.5)2PrCu2O8 compound with a high TN(Pr) of 9 K. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362153
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  • 4
    Electronic Resource
    Electronic Resource
    Cu spin reorientation in Tl(BaSr)PrCu2O7 : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6568-6570 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Cu spins in TlBa2PrCu2O7 order at TN≈370 K with a spin structure that is collinear and is characterized by the {1/21/21} wave vector, where the nearest neighbor spins are aligned antiparallel along all three crystallographic directions. If 50% of the Ba atoms are randomly replaced by the smaller Sr atoms to form Tl(BaSr)PrCu2O7, the TN of the Cu spins reduces to 350 K but the magnetic structure that forms below TN is the same. However, at T≈20 K the Cu spins undergo a change in structure, and the spin arrangement is then characterized by the {1/21/21/2} wave vector below T≈12 K. The ground state spin structure of the Cu ions in Tl(BaSr)PrCu2O7 is hence noncollinear, where the spin directions of the nearest neighbor Cu ions in the ab plane remain collinear and antiparallel while along the c axis they are orthogonal. These results demonstrate that the atoms in the BaO layers are also actively participating in the coupling between the Cu ions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361883
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  • 5
    Electronic Resource
    Electronic Resource
    Field dependence of magnetic transitions for magnetic superconductors RNi2B2C (R=Dy, Ho) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5863-5865 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High field (up to 5 T) magnetization measurements were performed on both bulk and field-aligned powder samples of RNi2B2C (R=Dy, Ho) magnetic superconductors. For Tc=3.8 K, a DyNi2B2C superconductor with antiferromagnetic Néel temperature TN of 10–11 K, and anomalous field-induced weak-ferromagnetic transitions were observed above the superconducting upper critical field Hc2(2 K) of 1.75 kG. The aligned powders show distinct hysteresis characteristics for both fields applied parallel and perpendicular to the tetragonal basal plane. For Tc=7.8 K, HoNi2B2C has an incommensurate magnetic ordering temperature Tm of 6 K and TN of 5.2 K. Anomalous field-induced weak-ferromagnetic transitions were also observed below TN. No hysteresis can be detected for TN〈T〈Tm. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362152
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  • 6
    Electronic Resource
    Electronic Resource
    Non-s-wave behavior of c-axis aligned Pr1.85Ce0.15CuO3.97 superconducting powder (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7660-7662 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The tetragonal c-axis alignment of Tc=23 K Pr1.85Ce0.15CuO3.97 superconducting powder was achieved in a 1 T alignment field with rotating powder/epoxy holder perpendicular to the alignment field. The in-plane penetration depth λab for this electron-doped superconductor was derived using zero-field-cooled Meissner diamagnetic data with low applied field (Ba〈Hc1ab) parallel to the c-axis aligned powder. A small Pr paramagnetic contribution was subtracted. The temperature dependence of Δλab(T)=λab(T)−λab(0) [with λab(0)∼133 nm] up to ∼0.5 Tc can be fitted well with a non-s-wave or d-wave-like power law Δλab(T)=AT2+CT4, where the T2 law is dominated at low temperature. The present result agrees with recent phase-sensitive experiment, which indicates d-wave nature for these electron-doped 214 cuprates. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1356052
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic properties of Bi-doped Gd2−xBixCuO4 cuprates (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5362-5364 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural and magnetic properties of the new Bi-doped Gd2−xBixCuO4 system are reported. With the doping of larger trivalent Bi3+ ions, the T′ phase solubility region is retained in the range of 0≤x≤0.1. Weak ferromagnetic or canted antiferromagnetic ordering temperature TN(Cu) of Cu moments decreases from 282 K for Gd2CuO4 to 258 K for Gd1.93Bi0.07CuO4 and 256 K for Gd1.9Bi0.1CuO4. Due to small internal field Hint associated with weak ferromagnetic order, the spin reorientation temperature Tsr(Cu) is field dependent and decreases from 24 K in 1 G to 12 K in 1 kG for Gd1.95Bi0.05CuO4. Preliminary powder x-ray Rietveld refinement analysis using the T′ phase ideal oxygen position indicates a large temperature factor B for the oxygen sites in the Cu–O plane and suggests that the degree of oxygen structural distortion may be closely related to the strength of weak ferromagnetic order. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370253
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  • 8
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of pseudoternary Nd2(Fe1−xCux)14B compounds (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2739-2741 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and crystallographic measurements have been made on new pseudoternary compounds Nd2(Fe1−xCux)14B in order to study the systematic variation of magnetic properties with Cu substitution. X-ray powder diffraction data indicate that the tetragonal Nd2Fe14B-type phase exists only for x≤0.05. Partial replacement of Fe by nonmagnetic Cu significantly decreases the saturation magnetization value with little change in ferromagnetic Curie temperature TC. Low-temperature spin orientation temperature (Tsr) decreases from 135 K for x=0.00 to 130 K for x=0.03, and 122 K for x=0.05, and the tilt angle of the easy magnetization direction from the tetragonal c axis decreases accordingly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340969
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic properties of high-oxygen pressure prepared PrBa2Cu3O7−y cuprates (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7484-7486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High oxygen pressure annealed PrBa2Cu3O7−y (y∼0) cuprates were prepared in order to study the effect of oxygen stoichiometric parameter y on the unusual Pr/Cu magnetic properties and/or recently reported superconductivity. The oxygen-rich orthorhombic 123-chain phase is highly unstable under high-oxygen pressure synthesis and decomposes completely in 10 bar pressure. For a smaller 2 bar prepared sample a relatively clean phase was preserved with an oxygen parameter y=0.05, as compared with y=0.11 from a conventional 1 bar flowing oxygen method. No superconductivity can be detected for all high-oxygen pressure prepared samples. Instead, Mott-insulator behavior with anomalous high Pr ordering TN(Pr)=19 K was observed for PrBa2Cu3O6.95. Comparison with other Pr/Ba intersubstituted Pr1−xBa2−xCu3O7−y cuprates is discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1357859
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic and crystallographic properties of the permanent magnet systems (R1−xScx)2Fe14B (R=Y, Nd, Dy, Er, Lu) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5546-5548 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and crystallographic measurements have been made on the rare-earth iron boride systems (R1−xScx)2Fe14B (R=Y, Nd, Dy, Er, Lu). Powder x-ray diffraction data indicate that a Nd2Fe14B-type single phase persists up to x=0.2 with lattice parameters decreasing slightly due to the smaller metallic radius of the Sc3+ ions. The variation of magnetic moments per formula unit with nonmagnetic Sc substitution depends on the smaller Sc size and the nature of the magnetic alignment of the rare-earth sublattice (nonmagnetic in Y and Lu, ferromagnetic axial in Nd, ferromagnetic planar in Er, and antiferromagnetic axial in Dy) with respect to the iron sublattice. The Curie temperature TC decreases monotonically with progressive addition of Sc atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342331
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