Search
Abstract
The synthesis, crystal structure, and physical properties (magnetization, resistivity, heat capacity) in combination with theoretical calculations of the electronic structure and phonon properties are reported for intermetallic compounds LiPd2X (X = Si, Ge, and Sn). LeBail refinement of powder x-ray diffraction data confirms that all compounds belong to the Heusler family (space group Fm-3m, No. 225). The lattice parameter increases with atomic size of X, and its value varies from a = 5.9059(4) Å for LiPd2Si and a = 6.0082(3) Å for LiPd2Ge, to a = 6.2644(1) Å for LiPd2Sn. The first compound, LiPd2Si, has apparently not been previously reported. All measured quantities demonstrate that LiPd2Ge exhibits superconductivity below Tc = 1.96 K and the normal and superconducting-state data indicate that it is a weak-strength type-I superconductor (C/γ Tc = 1.38) with electron-phonon coupling constant λe−p = (0.53 − 0.56). LiPd2Si and LiPd2Sn are not superconducting above 1.68 K. The experimental observations are supported by theoretical calculations which show that LiPd2Ge has the highest computed λe−p and Tc of the group. A strong softening of the acoustic phonon mode is calculated, and in the case of X = Ge and Sn, imaginary phonon frequencies were computed. The soft mode is most pronounced in the case of LiPd2Ge, which suggests its correlation with superconductivity.
Citations
-
1 7
CrossRef
-
0
Web of Science
-
1 7
Scopus
Authors (7)
-
Gabriel Kuderowicz
-
Elizabeth M. Carnicom
-
Kamil Kutorasiński
-
Bartlomiej Wiendlocha
-
Robert J. Cava
Cite as
Full text
- Publication version
- Accepted or Published Version
- License
- Copyright (2020 American Physical Society)
Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
PHYSICAL REVIEW B
no. 102,
pages 1 - 13,
ISSN: 2469-9950 - Language:
- English
- Publication year:
- 2020
- Bibliographic description:
- Górnicka K., Kuderowicz G., Carnicom E., Kutorasiński K., Wiendlocha B., Cava R., Klimczuk T.: Soft-mode enhanced type-I superconductivity in LiPd2Ge// PHYSICAL REVIEW B -Vol. 102,iss. 2 (2020), s.1-13
- DOI:
- Digital Object Identifier (open in new tab) 10.1103/physrevb.102.024507
- Verified by:
- Gdańsk University of Technology
seen 195 times
Recommended for you
Rattling-enhanced superconductivity in MV2Al20 (M = Sc, Lu, Y) intermetallic cage compounds
- M. J. Winiarski,
- B. Wiendlocha,
- M. Sternik
- + 4 authors
Superconductivity in LiGa2Ir Heusler type compound with VEC = 16
- K. Górnicka,
- G. Kuderowicz,
- M. Winiarski
- + 2 authors
Absence of superconductivity in fluorine-doped neptunium pnictide NpFeAsO
- A. Walters,
- H. Walker,
- R. Springell
- + 10 authors
Pressure effects on the superconductivity of the HfPd2Al Heusler compound: Experimental and theoretical study
- B. Wiendlocha,
- M. Winiarski,
- M. Muras
- + 5 authors