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Superconductivity in a breathing kagome metals ROs2 (R = Sc, Y, Lu).

Authors :
Górnicka, Karolina
Winiarski, Michał J.
Walicka, Dorota I.
Klimczuk, Tomasz
Source :
Scientific Reports; 11/18/2023, Vol. 13 Issue 1, p1-11, 11p
Publication Year :
2023

Abstract

We have successfully synthesized three osmium-based hexagonal Laves compounds ROs<subscript>2</subscript> (R = Sc, Y, Lu), and discussed their physical properties. LeBail refinement of pXRD data confirms that all compounds crystallize in the hexagonal centrosymmetric MgZn<subscript>2</subscript>-type structure (P6<subscript>3</subscript>/mmc, No. 194). The refined lattice parameters are a = b = 5.1791(1) Å and c = 8.4841(2) Å for ScOs<subscript>2</subscript>, a = b = 5.2571(3) Å and c = 8.6613(2) Å for LuOs<subscript>2</subscript> and a = b = 5.3067(6) Å and c = 8.7904(1) Å for YOs<subscript>2</subscript>. ROs<subscript>2</subscript> Laves phases can be viewed as a stacking of kagome nets interleaved with triangular layers. Temperature-dependent magnetic susceptibility, resistivity and heat capacity measurements confirm bulk superconductivity at critical temperatures, T<subscript>c</subscript>, of 5.36, 4.55, and 3.47 K for ScOs<subscript>2</subscript>, YOs<subscript>2</subscript>, and LuOs<subscript>2</subscript>, respectively. We have shown that all investigated Laves compounds are weakly-coupled type-II superconductors. DFT calculations revealed that the band structure of ROs<subscript>2</subscript> is intricate due to multiple interacting d orbitals of Os and R. Nonetheless, the kagome-derived bands maintain their overall shape, and the Fermi level crosses a number of bands that originate from the kagome flat bands, broadened by interlayer interaction. As a result, ROs<subscript>2</subscript> can be classified as (breathing) kagome metal superconductors. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20452322
Volume :
13
Issue :
1
Database :
Complementary Index
Journal :
Scientific Reports
Publication Type :
Academic Journal
Accession number :
173738610
Full Text :
https://doi.org/10.1038/s41598-023-43621-w