Abstract
An apparatus has been designed which measures the baric coefficient γ, defined as the relative change of a resistance under pressure: R=R0(1+γp), using a double ac method, the pressure modulation of the resistance being obtained via compressional sound waves. First results on manganites RE1−xAxMnO3 are obtained and compared with the pressure derivatives of R(p,T) as obtained with static methods. Good agreement was obtained at larger superimposed static pressure Pst, however, extra results are obtained in the limit Pst→0 and in the case of a percolation of phase separated volumes.
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