Anisotropic lattice compression of α- and β-CePdZn
Abstract
The lattice constants of ZrNiAl type α-CePdZn and TiNiSi type β-CePdZn were measured at high pressure up to 14 GPa at room temperature using X-ray diffraction (XRD) and a diamond anvil cell. The pressure dependence of lattice constants and volume of α-CePdZn were found to be smooth without any discontinuity, and having a bulk modulus, B0, and its pressure derivative, B0‧, of 67 GPa and 5.1, respectively. On the other hand, the a and b axes as well as volume of β-CePdZn were found to show anomalous pressure dependence at around 8 GPa. B0 and B0‧ of β-CePdZn were 90 GPa and 2.1, respectively. These results suggest that a crossover in the electronic states is induced by applying pressure to β-CePdZn. The origins of these anomalous behaviors are discussed in connection with crossover and change in the topology of Fermi surface.
- Publication:
-
Physica B Condensed Matter
- Pub Date:
- May 2018
- DOI:
- 10.1016/j.physb.2017.10.044
- Bibcode:
- 2018PhyB..536..293O
- Keywords:
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- Crossover;
- Lattice constants and volume;
- Bulk modulus;
- High pressure;
- Fermi surface topology