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  • 1985-1989  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Linear-chain ordering in a spin-3/2 system: magnetic susceptibilities of trichlorotris(pyridine)chromium (1989)
    s.l. : American Chemical Society
    Inorganic chemistry 28 (1989), S. 4125-4128 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00321a017
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Large paramagnetic anisotropy of NaMg[Cr(oxalate)3]⋅9H2O (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 1546-1548 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The magnetic susceptibilities of single crystals of NaMg[Cr(oxalate)3]⋅9H2O are reported over the temperature interval 40 mK–4.2 K. Large anisotropy is observed due to the large zero-field splitting of the 4A2 ground state; the parameters that fit the data are 2D/k =−2.45(3) K, g(parallel)=1.985(5), g⊥=2.035(10), and an exchange correction of zJ/k =0.006(1) K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453266
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetochemistry of chromium (III) (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3575-3575 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There are relatively few superexchange-coupled antiferromagnets of chromium (III), largely because the exchange interactions are so weak. We have begun a program to study these materials and present magnetic susceptibility measurements on several new systems. We find that a polycrystalline sample of [Cr(NH3)5Cl]Cl2 behaves as a magnetic linear chain, and orders antiferromagnetically at about 600 mK, and that single crystals of [Cr(en)3]X3⋅3H2O order at 130 mK when X is chloride. The analogous bromide orders at 112 mK. The chloride exhibits an easy axis, parallel to the longitudinal axis, while the bromide exhibits an easy plane. The data have been successfully fitted by several different procedures which result in much the same parameters. In addition to the exchange, it is necessary to include in the analysis the zero-field splitting of the chromium ions. The zero-field splitting in paramagnetic NaMg[Cr(oxalate)3]⋅9H2O has also been measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340698
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Single-crystal ac susceptibility measurements on [Co(NH3)6][CuCl5], a 3D, S=1/2 Heisenberg antiferromagnet (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3566-3568 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-crystal ac magnetic susceptibilities of [Co(NH3)6][CuCl5] along the three crystallographic axes in the temperature range from 1.1 to 90 K are presented. The magnetic behavior is characteristic of a three-dimensional antiferromagnet, its ordering temperature being at Tc=3.8 K. Susceptibilty data can be fit to a Heisenberg S=1/2 simple cubic model using high-temperature series expansions extrapolated with Pade approximants. Good agreement is found for an exchange constant J/kB=−3.13 K and values of g factor ga=2.09, gb=gc =2.04, a,b, and c being the crystallographic axes. This result makes [Co(NH3)6][CuCl5] one of the few examples of a 3D antiferromagnetic Heisenberg S=1/2 model. The magnetic behavior below Tc indicates the existence of crystallographic domains due to the structural transition from cubic to tetragonal symmetry that the system has at about 280 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340720
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    Paper (German National Licenses)
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