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  • 75.30.Ds  (1)
  • neutron scattering  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Spin dynamics and spin correlations in the spinS=1 two-dimensional square-lattice Heisenberg antiferromagnet La2NiO4 (1995)
    Springer
    The European physical journal 96 (1995), S. 479-489 
    Details
    ISSN: 1434-6036
    Keywords: 75.10.Jm ; 75.25.tZ ; 75.40.−S ; 75.30.Ds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The static and dynamic spin fluctuations in the spinS=1, two-dimensional (2D) square-lattice antiferromagnet La2NiO4 have been studied over a wide temperature range using neutron scattering techniques. The spin correlations in La2NiO4 exhibit a crossover from two- to three-dimensional (3D) behavior as the Néel temperature is approached from above. Critical slowing down of the low-energy spin fluctuations is also observed just aboveT N . The correlation length, ξ(T), and the static structure factor,S(0), have been measured and are compared with recent theoretical calculations for the quantum 2D Heisenberg antiferromagnet using microscopic parameters determined from previous spin-wave measurements. Good agreement for ξ(T) is found with the exact low-temperature result of Hasenfratz and Niedermeyer provided that 2π p s is renormalized by ≈20% from the spin-wave value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313845
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  • 2
    Electronic Resource
    Electronic Resource
    Local structural instability of high-T c oxide superconductors studied by inelastic neutron scattering (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 415-418 
    Details
    ISSN: 1572-9605
    Keywords: Oxide superconductors ; structural instability ; neutron scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The scattering function,S(Q, E), of superconducting La1.85Sr0.15CuO4 and YBa2Cu3O7 was measured over a wide range ofQ-E space by inelastic neutron scattering. Fine structures in their phonon density of states as well as theQ-dependences ofS(Q, E) were observed. TheQ-dependence ofS(Q, E) is very susceptive atT c , with an anomalous behavior similar to a critical phenomenon. We have found that the anomalous behavior is related to the local structural instability, i.e., the 〈110〉 buckling motion of the Cu-O plane and the shortening of the distance between the apical oxygen and the copper atom in the plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00724579
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