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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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Authors (8)
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B. Wiendlocha
- . .
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M. Muras
- . .
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C. Zvoriste-Walters
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J. C. Griveau
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S. Heathman
- . .
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/PhysRevB.91.024509
- License
- Copyright (2015 American Physical Society)
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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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