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  • 1995-1999  (1)
  • 1985-1989  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    NMRON studies of the quasi-2-dimensional ferromagnet 54Mn-Mn(COOCH3)2·4H2O (1997)
    Springer
    Hyperfine interactions 108 (1997), S. 443-464 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Pulsed and continuous wave NMRON, and NMR thermally detected by Nuclear Orientation have been used to investigate the magnetic properties of the quasi-2-dimensional ferromagnet 54Mn-Mn(COOCH3)·4H2O. The NMR frequencies of both the 54Mn spins and the abundant 55Mn spins have been determined for the two crystalline lattice sites Mn1 and Mn2. The line widths of the 54Mn resonances are homogeneously broadened to about 300 kHz, and the 55Mn resonances are significantly pulled down in frequency. The spin-lattice relaxation times in low applied magnetic fields are short with T1 for the Mn2 site being much less than the value for the Mn1 site. Level crossing is observed between the Mn1 and Mn2 resonances in an applied field of 2.6 T.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1012604005967
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  • 2
    Digitale Medien
    Digitale Medien
    Nuclear spin-lattice relaxation in54Mn-MnCl2.4H2O and lower dimensional magnetic systems (1989)
    Springer
    Hyperfine interactions 51 (1989), S. 1111-1118 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report on nuclear spin-lattice relaxation studies on54Mn-MnCl2.4H2O and 2-dimensional54Mn-Mn(COOCH3)2.4H2O. In the former crystal, we find that at the lowest temperatures a direct process, normally thought of as forbidden, becomes the mechanism for relaxation. In lower dimensional systems the relaxation might be expected to be relatively fast and indeed in the acetate the relaxation timeT 1 is ≈1000 s in an applied field of 0.2 T for the Mn2 site and is much shorter at lower fields. In 1-dimensional54Mn-(CH3)4NMnCl3(TMMC) a significant γ-ray anisotropy is observed on cooling indicating thatT 1 is also short in this system. The shortness ofT 1 in the lower dimensional systems suggests that they may be suitable hosts for on-line experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02407836
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  • 3
    Digitale Medien
    Digitale Medien
    Nuclear orientation and nuclear spin-lattice relaxation in insulating magnetically ordered crystals (1988)
    Springer
    Hyperfine interactions 43 (1988), S. 311-318 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The mechanism of nuclear spin-lattice relaxation in insulating magnetically ordered crystals at low temperatures is discussed. In 3-dimensional systems the relaxation time T1 is long, but in the lower dimensional systems it can be quite short making them possible candidates for hosts in on-line experiments. An experiment in 2-dimensional54Mn−Mn (COOCH3)2·4H2O is discussed with particular reference to the relatively short value of T1 in low applied fields. A preliminary experiment in the 1-dimensional system54Mn−(CH3)4NMnCl3 (TMMC) is also described. Pulsed NMRON measurements in54Mn−MnCl2·4H2O are outlined and the advant-systems with fast relaxation emphasized.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02398311
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  • 4
    Digitale Medien
    Digitale Medien
    Pulsed nuclear magnetic resonance of oriented nuclei in an insulating magnetic material:54Mn−MnCl2.4H2O (1987)
    Springer
    Hyperfine interactions 36 (1987), S. 161-170 
    Details
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The first observation of pulsed nuclear magnetic resonance of oriented nuclei in an insulating magnetic material is reported. The system studied was the ordered antiferromagnet54Mn−MnCl2.4H2O. The response of the54Mn spins to a single pulse of variable length, the free induction decay, and Hahn spin-echo have all been observed. A discussion of the transverse decoherent relaxation timeT 2 in MnCl2.4H2O is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02395349
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