Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1995-1999  (5)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Finite temperature effects in the S=1/2 Heisenberg chain Cu(C6D5COO)2⋅3D2O (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5391-5391 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quasi-one-dimensional magnetic materials provide important test beds for rigorous models of interacting many-body systems. Nevertheless, there have been few studies of finite temperature effects on spin correlations in low-spin systems, though these are most likely to exhibit quantum effects. Copper benzoate, Cu(C6D5COO)2⋅3D2O, is a good realization of the S=1/2 Heisenberg antiferromagnetic chain (HAFC). We have performed ac susceptibility and inelastic neutron scattering experiments on this material which establish the Hamiltonian and an excitation spectrum which is consistent with the spinon continuum ansatz of Müller et al. We present inelastic neutron scattering measurements of the temperature evolution of the dynamic spin–spin correlation function Szz(π,ω). Comparison will be made to the classical prediction and to a finite temperature field theory of Schulz as applied to this S=1/2 HAFC. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362314
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Strong magnetic fluctuations in transition metal oxides (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5023-5028 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Most magnets have long-range magnetic order when the thermal energy is less than the local magnetic exchange energy (T〈||aitch-thetaCW||). Effects such as reduced dimensionality and frustration, however, can suppress the ordering transition and lead to unusual cooperative paramagnetic phases at low temperatures. We review neutron scattering experiments exploring such short-range-ordered phases in insulating transition metal oxides. We discuss (V1−xCrx)2O3, in which orbital fluctuations appear to limit spin correlations to within small "molecular'' clusters, SrCr9pGa12−9pO19, in which geometrical frustration allows local anitferromagnetic constraints to be fulfilled without long-ranged order, and Y2BaNiO5, in which magnetic interactions occur only within chains of spins which are unable to order because of the Haldane effect. Emphasis is placed on the common features of exchange interactions in these oxides and the important role which magnetic neutron scattering has played in understanding the unusual magnetic phenomena. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361564
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Temperature-dependent magnetism in transition metal films observed by magnetic force microscopy and classical magnetometry (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4607-4609 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pure Co and Pd–Co alloy films were prepared using electron beam evaporation and sputtering. They were characterized by superconducting quantum interference device magnetometry and magnetic force microscopy (MFM). The magnetic hysteresis curves for the Co film show that the magnetization direction is in the plane of the film. The magnetization data reveal a Curie temperature for the alloy of 370 K, and a preference for the moments to orient perpendicular to the film. MFM images of magnetic domains were obtained for 298 and 323 K. In the Pd–Co film, the phase contrast between the oppositely magnetized domains decreases by 35% as the temperature of the film is raised, even though the dominant length scale of the domains (about 0.25 μm) remains unchanged. A very different result was obtained for the pure Co film: Over the same temperature range the phase contrast in the magnetic images in the Co film decreased only by 10%. This indicates that the observed behavior in the Pd–Co film is mainly due to the much more rapid change in magnetic properties as a function of temperature. We also observe that, while less temperature dependent, the contrast of the magnetic domain images of the Co film is smaller than that of the Pd–Co, a result most likely due to the reorientation of the moments on going from the pure Co film to the Pd–Co film. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370423
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Spin gap and magnetic coherence in a clean high-temperature superconductor (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 43-46 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A notable aspect of high-temperature superconductivity in the copper oxides is the unconventional nature of the underlying paired-electron state. A direct manifestation of the unconventional state is a pairing energy—that is, the energy required to remove one electron from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/21840
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Spin fluctuations in YBa 2 Cu 3 O 6.6 (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 395 (1998), S. 580-582 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] An important feature of the high-transition-temperature (high-Tc) copper oxide superconductors is the magnetism that results from the spins associated with the incomplete outer electronic shells (3d9) of the copper ions. Fluctuations of these spins give rise to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/26931
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...