Pressure effects on the superconductivity of the HfPd2Al Heusler compound: Experimental and theoretical study - Publication - Bridge of Knowledge

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Pressure effects on the superconductivity of the HfPd2Al Heusler compound: Experimental and theoretical study

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 450 °C. 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)×10−5K−1, and the bulk modulus derived from the fit to the third-order Birch-Murnaghan equation of state is B0=97(2) GPa. Resistivity studies under applied pressure (p≤7.49GPa) showed a linear decrease of superconducting critical temperature with increasing pressure and the slope dTc/dp=−0.13(1)KGPa−1. The same behavior is observed for the electron-phonon coupling constant λep(p) that changes from 0.67 to 0.6, estimated for p=0.05 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 λep and its evolution with pressure. Theoretical results explain the experimentally observed decrease in Tc due to considerable lattice stiffening.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
PHYSICAL REVIEW B no. 91, edition 2, pages 1 - 10,
ISSN: 2469-9950
Language:
English
Publication year:
2015
Bibliographic description:
Wiendlocha B., Winiarski M., Muras M., Zvoriste-Walters C., Griveau J., Heathman S., Gazda M., Klimczuk T.: Pressure effects on the superconductivity of the HfPd2Al Heusler compound: Experimental and theoretical study// PHYSICAL REVIEW B. -Vol. 91, iss. 2 (2015), s.1-10
DOI:
Digital Object Identifier (open in new tab) 10.1103/physrevb.91.024509
Verified by:
Gdańsk University of Technology

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