Abstract By using the brick-wall model we calculate the free energy and the entropy including the superradiant effect mode of the scalar field in Demianski-Newman black hole. When the radial cut-off factor $\bar{\varepsilon}$ and the angular cut-off factor $\delta$ satisfy a proper relation, the entropy can be written as S=AH/4.
Received: 22 June 1998
Revised: 08 October 1998
Accepted manuscript online:
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