Please use this identifier to cite or link to this item:
|Title:||Pressure effects on the superconductivity of the HfPd2Al Heusler compound - Experimental and theoretical study|
|Authors:||WIENDLOCHA B.; WINIARSKI M. J.; MURAS M.; ZVORISTE CARMEN ELENA; GRIVEAU Jean-Christophe; HEATHMAN STEPHEN; GAZDA M.; KLIMCZUK Tomasz|
|Citation:||PHYSICAL REVIEW B vol. 91 no. 02 p. 024509|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||Polycrystalline HfPd2Al has been synthesized using the arc-melting method and studied under ambient pressure conditions by x-ray diffraction from room temperature up to 450oC. High pressure x-ray diffraction up to 23 GPa was also performed using Diacell-type membrane diamond anvil cells. The estimated linear thermal expansion coefficient was found to be α = 1.40(3)·10-5 K-1, and the bulk modulus derived from the fit to the 3rd order Birch-Murnaghan EOS (BMEOS) is B0 = 97(2) GPa. Resistivity studies under applied pressure (p ≤ 7.49 GPa) showed a linear decrease of superconducting critical temperature with increasing pressure and the slope dTc/dp = -0.13(1) K GPa-1. The same behavior is observed for the electron-phonon coupling constant ep(p) that changes from 0.67 to 0.6, estimated for p = 0.05 GPa and 7.49 GPa, respectively. First principles electronic structure and phonon calculation results are presented and used to estimate the magnitude of electron-phonon interaction ep and its evolution with pressure. Theoretical results explain the experimentally observed decrease in Tc due to considerable lattice stiffening.|
|JRC Directorate:||Nuclear Safety and Security|
Files in This Item:
There are no files associated with this item.
Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.