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  • American Institute of Physics (AIP)  (3)
  • 1
    Electronic Resource
    Electronic Resource
    ac magnetic susceptibility of tetramethylammonium copper chloride (TMCuC): S=(1)/(2), Heisenberg one-dimensional ferromagnet (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5481-5482 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ac susceptibility of powder sample TMCuC, a S= (1)/(2) , 1D Heisenberg ferromagnet, was measured in the temperature range 4.2 K≤T≤20 K and in the fields 1, 1.5, and 2 T. The data are compared with the theory of Johnson and Bonner [J. D. Johnson and J. C. Bonner, Phys. Rev. B 22, 251 (1980)], which includes the spin-wave and bound spin-wave excitations. Preliminary fittings yield parameters J/k=45 K, average g value=2.1, and γ=0.955 (anisotropy 4.5%), and show that the bound-state excitations have a significant effect on the magnetic behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345857
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic susceptibility in the spin glass system, [(CH3)3NH]CO1−xNixCl3 2H2O (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4357-4357 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pseudo-one-dimensional mixed system [(CH3)3NH]Co1−xNixCl3 2H2O was found to exhibit spin-glass behavior below a characteristic temperature evidenced by the onset of time-dependent thermoremanent magnetization. In order to confirm the spin-glass behavior we now have studied the ac susceptibility of this series in zero field using an ac SQUID susceptometer. Along the weak ferromagnetic axis (a axis), the ac susceptibility shows a cusp at the spin-glass transition temperature. Increasing the measurement frequency from 80 to 160 Hz increases the slope of the susceptibility below the transition temperature but no significant shift in the transition temperature itself is seen for this small frequency range. Spin-glass behavior is seen only along the a axis and a typical antiferromagnetic transition is seen along the c axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340174
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic tricritical behavior of ethylammonium tetrachlorocuprate (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3031-3033 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to investigate the prediction by Tuthill that a tricritical point may exist in the phase diagram of spin-flop antiferromagnets with intermediate anisotropy, an experimental reexamination of the phase diagram of the quasi-two-dimensional system (C2H5NH3)2CuCl4 was performed. Measurements were made of the differential magnetic susceptibility, dM/dH, vs dc field and temperature in the (10 K, 100 Oe) region of the proposed tricritical point. A low amplitude, low frequency, ac biphase SQUID susceptometer was used. The sample was a single crystal with field along the antiferromagnetic easy (orthorhombic a-axis) direction. The data show some evidence of the existence of at least one tricritical point, but the results are not definitive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340883
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