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Calorimetric and transport investigations of CePd2+xGe2-x (x=0 and 0.02) up to 22 GPa

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Published in Physical Review. B, Condensed Matter. 2002, vol. 66, no. 6
Abstract The influence of pressure on the magnetically ordered CePd2.02Ge1.98 has been investigated by a combined measurement of electrical resistivity r (T) and ac calorimetry C(T), for temperatures in the range 0.3 K ,T,10 K and pressures p up to 22 GPa. Simultaneously, CePd2Ge2 has been examined by r (T) down to 40 mK. In CePd2.02Ge1.98 and CePd2Ge2 the magnetic order is suppressed at a critical pressure pc511.0 GPa and pc513.8 GPa, respectively. In the case of CePd2.02Ge1.98 the temperature coefficient A of r (T) not only indicates the loss of magnetic order but also the ac signal 1/Vac}C/T recorded at low temperature. The residual resistivity is extremely pressure sensitive and passes through a maximum and then a minimum in the vicinity of pc . The (T,p) phase diagram and the A(p) dependence of both compounds can be qualitatively understood in terms of a pressure-tuned competition between magnetic order and the Kondo effect according to the Doniach picture. The temperature-volume (T,V) phase diagram of CePd2Ge2 combined with that of CePd2Si2 shows that in stoichiometric compounds mainly the change of interatomic distances influences the exchange interaction. It will be argued that in contrast to this the much lower pc value of CePd2.02Ge1.98 is caused by an enhanced hybridization between 4 f and conduction electrons
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Other version: http://link.aps.org/doi/10.1103/PhysRevB.66.064428
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WILHELM, Heribert, JACCARD, Didier. Calorimetric and transport investigations of CePd2+xGe2-x (x=0 and 0.02) up to 22 GPa. In: Physical Review. B, Condensed Matter, 2002, vol. 66, n° 6. https://archive-ouverte.unige.ch/unige:35757

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Deposited on : 2014-04-15

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