Soft-mode enhanced type-I superconductivity in LiPd2Ge - Publikacja - MOST Wiedzy

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Soft-mode enhanced type-I superconductivity in LiPd2Ge

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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.

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Copyright (2020 American Physical Society)

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuły w czasopismach
Opublikowano w:
PHYSICAL REVIEW B nr 102, strony 1 - 13,
ISSN: 1098-0121
Język:
angielski
Rok wydania:
2020
Opis bibliograficzny:
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:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1103/physrevb.102.024507
Weryfikacja:
Politechnika Gdańska

wyświetlono 41 razy

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