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  • 1
    Electronic Resource
    Electronic Resource
    Time-resolved emission spectroscopy of the high Tc superconductor YBa2Cu3O7−x under laser ablation (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1278-1279 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved luminescence spectroscopy is described for high Tc YBa2Cu3O7−x under 8 ps/530 nm laser ablation. The emission spectrum covered most of the visible spectrum and showed emission lines from ions. The emission profiles in time consist of fast (≈25 ps) and slow (≈1 ns) decay components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101490
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  • 2
    Electronic Resource
    Electronic Resource
    Steps in the hysteresis loops of a high-spin molecule : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6031-6033 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the first observation of steps in the hysteresis loop of a high-spin molecular magnet. We propose that the steps, which occur every 0.46 T, are due to thermally assisted resonant tunneling between different quantum spin states. Magnetic relaxation increases dramatically when the field is in the neighborhood of a step. A simple model accounts for the observations and predicts a value for the anisotropy barrier consistent with that inferred from the superparamagnetic blocking temperature. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361837
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  • 3
    Electronic Resource
    Electronic Resource
    A calibration curve for room-temperature resistivity versus carrier concentration in n-type CdSe (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2703-2704 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A calibration curve is given of the room-temperature resistivity as a function of carrier concentration for n-type CdSe, where net carrier concentrations between 1017 and 3×1018 cm−3 were determined from room-temperature Hall coefficient measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348642
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of the Hall coefficient using van der Pauw method without magnetic field reversal (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1342-1343 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The van der Pauw geometry has been widely used for the measurement of resistivities and Hall coefficients. Although the measurement of a Hall coefficient requires a finite magnetic field, it should be noted that van der Pauw's expression is valid only in the limit of zero field; in addition to the Hall contribution, measurements in a finite magnetic field generally include a term associated with field-induced changes in the longitudinal resistivity. Although a simple solution to this problem entails taking the difference between readings in opposite field directions, there are circumstances where this may be impractical. In this note we present a straightforward extension of the van der Pauw calculation which allows a determination of the Hall coefficient from quantities measured in one field direction only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140990
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  • 5
    Electronic Resource
    Electronic Resource
    Transition between thermally assisted relaxation and quantum tunneling in a molecular magnet (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6802-6804 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report Hall sensor measurements of the magnetic relaxation of Mn12–acetate as a function of magnetic field applied along the easy axis of magnetization. Data taken at a series of closely spaced temperatures between 0.24 and 1.9 K provide new clues for understanding the physics of quantum tunneling of magnetization in Mn12–acetate. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1358329
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  • 6
    Electronic Resource
    Electronic Resource
    Inelastic neutron scattering study of Mn12–acetate (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5636-5638 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report zero-field inelastic neutron scattering experiments on a deuterated powder sample of Mn12–acetate consisting of a large number of nominally identical spin-10 magnetic clusters. Our resolution enables us to see a series of peaks corresponding to transitions between the anisotropy levels within the spin-10 manifold. A fit to the spin Hamiltonian H=−DSz2−μBB⋅g⋅S−ASz4+C(S+4+S−4) yields an anisotropy constant D=(0.54±0.02) K and a fourth-order diagonal anisotropy coefficient A=(1.2±0.1)×10−3 K (the other terms being negligible). Performed in the absence of a magnetic field, our experiments do not involve the g values as fitting parameters, thereby yielding particularly reliable values of D and A. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369824
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic study of carbon chars in the transition range (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 2681-2685 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using static techniques, we have measured the susceptibility and magnetization of carbon chars heat treated at temperatures between 1000 and 1500 °C, the so-called "transition range,'' where equivalent information is unavailable by electron spin resonance measurements due to severe line broadening effects. A small increase is observed in the Curie contribution to the susceptibility as a function of heat-treatment temperature, indicating the appearance of unpaired spins possibly associated with structural changes which occur in the transition range. The diamagnetism of these chars increases rapidly with increasing heat-treatment temperature, and a strong temperature dependence appears which is consistent with behavior expected for a two-dimensional gas of charged carriers. The latter can be ascribed to the formation and growth of microcrystalline graphitic regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335903
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  • 8
    Electronic Resource
    Electronic Resource
    Susceptibility of Si:P across the metal-insulator transition (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3558-3558 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have made static susceptibility measurements at temperatures down to 1.25 K on samples of phosphorus doped silicon with dopant concentrations in the range 0.75〈n/nc〈1.25, where nc is the critical concentration for the metal-insulator transition. We find that a quantitative knowledge of the diamagnetism associated with the phosphorus dopants is a necessary prerequisite for any quantitative analysis of the paramagnetism in this narrow range of concentration. The data at high temperatures (〉 70 K) indicate that the diamagnetic susceptibility in this concentration range is approximately proportional to the concentration, on the basis of which we find it possible to make an estimate of the diamagnetism associated with each dopant. Using this estimate, we show that the paramagnetism at low temperatures (1.25–10 K) exhibits no qualitative change in behavior as one crosses the metal-insulator transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338724
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of a transverse magnetic field on resonant magnetization tunneling in high-spin molecules : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3978-3980 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The recent observation of steps at regular intervals of magnetic field in the hysteresis loops of oriented crystals of the spin-10 molecular magnet Mn12O12(CH3COO)16(H2O)4 has been attributed to resonant tunneling between spin states. Here, we investigate the effect on the relaxation rate of applying the magnetic field at an angle with respect to the easy axis of magnetization. We find that the position of the resonances is independent of the transverse component of the field, and is determined solely by the longitudinal component. On the other hand, a transverse field significantly increases the relaxation rate, both on and off resonance. We discuss classical and quantum mechanical interpretations of this effect. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364912
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  • 10
    Electronic Resource
    Electronic Resource
    Novel phenomena in dilute electron systems in two dimensions (2004)
    Springer
    The European physical journal 40 (2004), S. 397-402 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Based on theory and experiments in weakly interacting electron systems, it was believed for many years that no metallic phase is possible in two dimensions. The unexpected observation of metallic-like behavior in strongly interacting electron systems has thus drawn considerable attention. Following background material and a brief history, we review the dramatic response of these 2D systems to in-plane magnetic fields, and the evidence this provides for a possible quantum phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00210-2
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