Anomalous behavior of CeTe under high pressures

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Abstract
The compression curve of CeTe up to 25 GPa was measured by x-ray diffraction in a diamond anvil cell. Below 8 GPa, CeTe maintains the NaCl-type structure with a bulk modulus and its first pressure derivative equal to 52.8 GPa and 13.6, respectively. These values are anomalous and indicate the presence of an extra electronic contribution to the free energy. At 8±1 GPa, the NaCl-type structure transforms into a CsCl type and the increase of the cerium-tellurium distance is larger than expected from the increase of the coordination number. At higher pressures, up to 25 GPa in the CsCl phase, the bulk modulus does not increase with pressure, and so an additive contribution to the lattice one is again present. The volume variations of CeTe with pressure are discussed assuming a valence change of the cerium ion or a strong enhancement of the Kondo interaction under pressure.

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