Browsing by Author "Gopal, E.S.R."

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    Specific heat study of the transition from ferromagnetism to antiferromagnetism in terbium
    (Journal of Magnetism and Magnetic Materials, 1984) Jayasuriya, K.D.; Campbell, S.J.; Stewart, A.M.; Gopal, E.S.R.
    The specificheat of single crystal terbium has been measured over the range 200?400 K. A value for the latent heat of (13.6 � 0.6) J mol?1 is obtained at the first order antiferromagnetic to ferromagnetic transition temperature Tc = (221.45 � 0.03) K. A temperature hysteresis of (0.24 � 0.03) K is observed in the transition.
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    The critical specific heat of terbium
    (Journal of Physics F: Metal Physics, 1983) Jayasuriya, K.D.; Gopal, E.S.R.; Campbell, S.J.; Stewart, A.M.
    Specific heat measurements have been carried out on a high-purity single crystal of terbium of mass 3.734 g between temperatures of 200 and 400K. The data around the Neel temperature TN, have been analysed in terms of the equation C+or-=(A+or-/ alpha +or-) mod t mod - alpha +or-(1+E+or- mod t mod x+or-)+B+or-+D+or-t where t=(T-TN+or-)/TN+or-. The parameters obtained from our best fit are alpha += alpha =-0.20+or-0.03, A+/A-=0.58+or-0.34, B+=B-=21.68+or-13.93 J mol-1 K-1, E+/E-=-2.06+or-4.12, D+=D-=4.99 J mol-1 K-1 and TN+=TN-=229.9503+or-0.0035K. This fit is valid in the critical regions -3.4