Abstract
The hexagonal layered compound, EuPtP, exhibits two valence transitions, atT1 = 235 K andT2 = 190 K, and anantiferromagnetic order at TN = 8.6 K. We have examined the effects of magnetic field and pressure, and thespecific heat. Analysis of the high-field experiments confirms that half of Euare in a divalent state at the lowest temperature, and that the number ofEu2 + increasesdiscontinuously at T2 and T1 with increasing temperature. The magnetic entropy reaches ∼ 22 J K − 1 mol − 1 at room temperature, which is larger than that expected forJ = 7/2 ofEu2 + (17.3 J K − 1 mol − 1). This is in good agreement with the magnetic entropy deduced from theinterconfigurational fluctuation model, which explains the valence transition inEu(Pd1 − xPtx)2Si2. The applicationof pressure shifts T1 and T2 higher and suppresses the intermediate phase (β phase,T2 < T < T1), whereas it does not change the properties of the low-temperature phase (γ phase,T < T2) andthe TN.
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