La.sub.2./sub.Pd.sub.2./sub.In: Superconductivity and lattice properties at ambient and elevated pressures

0563810 - FZÚ 2023 RIV GB eng J - Článek v odborném periodiku
Král, P. - Diviš, M. - Havela, L. - Proschek, P. - Doležal, P. - Kaštil, Jiří - Vondráčková, B. - Prchal, J.
La₂Pd₂In: Superconductivity and lattice properties at ambient and elevated pressures.
Journal of Physics-Condensed Matter. Roč. 34, č. 14 (2022), č. článku 145403. ISSN 0953-8984. E-ISSN 1361-648X
Grant CEP: GA MŠMT(CZ) LM2018096; GA ČR(CZ) GA21-09766S
Institucionální podpora: RVO:68378271
Klíčová slova: La₂Pd₂In * non-magnetic analogue * lattice anisotropy * high pressure * compressibility * superconductivity
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.7, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1088/1361-648X/ac4c15

Lattice and electronic properties of La2Pd2In were studied at ambient and elevated pressures so as to determine features related to a specific atomic coordination without any influence of magnetism. We describe temperature dependences of lattice parameters, heat capacity and electrical resistivity of single-crystalline La2Pd2In (s.g. P4/mbm) in a broad temperature range 0.09–300 K. Together with the anisotropic effect of hydrostatic pressure, showing that the lattice is more compressible in the basal plane, we can conclude that the lattice is affected by degrees of freedom of the La atoms with positions not imposed by symmetry. The lattice anisotropy is smaller than that found for isostructural ferromagnet Ce2Pd2In. The equilibrium bulk modulus B0 = (48 ± 3) GPa was determined on the basis of individual linear compressibilities. Measurement of electrical resistivity indicated a superconducting state below T = 0.59 K with a low critical field 0.005 T at T = 380 mK. The onset of superconducting state as a bulk property of La2Pd2In was confirmed by measurements of specific heat and AC magnetic susceptibility. Experimental data can be accounted by first-principles electronic-structure calculations based on density-functional theory. The measured Sommerfeld coefficient γ = 10.6 mJ mol−1 K−2, only marginally exceeding the calculated γ = 9.34 mJ mol−1 K−2, indicates only weak electronic correlations.
Trvalý link: https://hdl.handle.net/11104/0335601