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  • 1
    Electronic Resource
    Electronic Resource
    Anomalous heat capacity of antiferromagnet FeBr2 in a magnetic field : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 4396-4398 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Heat capacity measurements in external magnetic fields (H) have been performed on the Ising antiferromagnet FeBr2. The temperature dependence of the magnetic heat capacity shows two anomalies for 1.4 T≤H≤2.9 T. The anomaly at a higher temperature indicates the phase transition from the paramagnetic to antiferromagnetic phase. The anomaly at a lower temperature is formed by a sharp peak superposed on a broad shoulder. The existence of two peaks shows the occurrence of a new phase transition in addition to the antiferromagnetic transition in magnetic fields. A Monte Carlo simulation for the heat capacity reproduces the peak indicating the antiferromagnetic transition and the broad shoulder. The nonuniform spin configurations in the layers with negative moment, which is caused by the competition between the nearest-neighbor ferromagnetic and the next-nearest-neighbor antiferromagnetic interactions in the triangular Fe-planes, is shown to produce the broad shoulder. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364836
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  • 2
    Electronic Resource
    Electronic Resource
    Itinerant electron metamagnetism and related phenomena in Co-based intermetallic compounds (invited) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6682-6687 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Susceptibility and high field magnetization have been measured for Y(Co1−xMx)2 (M=Al, Fe, and Ni). YCo2 exhibits a metamagnetic transition at 69 T. Ni doping in YCo2 increases the critical field (Bc), while Fe doping decreases it. These changes can be elucidated with the band picture of metamagnetism. Bc of YCo2 exhibits a positive shift proportional to the square of temperature. In the paramagnetic region of Y(Co1−xAlx)2 with x≤0.11, the susceptibility is enhanced with Al and a sharp metamagnetic transition with lower Bc is observed. The susceptibility becomes maximum at a finite temperature Tmax. Bc in the ground state is proportional to Tmax. These experimental results are discussed with a new theory based on a spin fluctuation model. The susceptibility and the metamagnetic transition are found to be very sensitive to pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358167
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  • 3
    Electronic Resource
    Electronic Resource
    Neutron scattering study of transverse magnetism in the metamagnet (2000)
    Springer
    The European physical journal 15 (2000), S. 35-40 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) - 75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) - 75.50.Ee Antiferromagnetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In order to clarify the nature of the additional phase transition at H 1 ( T ) 〈 H c ( T ) of the layered antiferromagnetic (AF) insulator FeBr 2 as found by Aruga Katori et al. (1996) we measured the intensity of different Bragg-peaks in different scattering geometries. Transverse AF ordering is observed in both AF phases, AF I and AF II. Its order parameter exhibits a peak at T 1 = T ( H 1 ) in temperature scans and does not vanish in zero field. Possible origins of the step-like increase of the transverse ferromagnetic ordering induced by a weak in-plane field component when entering AF I below T1 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011034
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