Superconductivity at 4.8 K and Violation of Pauli Limit in La2IRu2 Comprising Ru Honeycomb Layer

Autor:	Yosuke Matsumoto, Mohammad Pakdaman, T. Takayama, Jürgen Nuss, Ulrich Wedig, Kentaro Kitagawa, Hajime Ishikawa, Marian Blankenhorn, Reinhard K. Kremer, Robert E. Dinnebier, Hidenori Takagi
Rok vydání:	2019
Předmět:	Superconductivity Condensed matter physics Chemistry Electron Inorganic Chemistry symbols.namesake Pauli exclusion principle Oxidation state Lattice (order) symbols Hexagonal lattice Physical and Theoretical Chemistry Electronic band structure Critical field
Zdroj:	Inorganic Chemistry. 58:12888-12894
ISSN:	1520-510X 0020-1669
Popis:	We discovered superconductivity at 4.8 K in the hexagonal layered compound La2IRu2 comprising a triangular lattice of the La and a honeycomb lattice of the Ru atoms. First-principles calculations reveal a two-dimensional band structure made up of La 5d and Ru 4d electrons and formal oxidation states +1.5 for the La and the uncommon oxidation state −1 for the Ru atoms. The temperature dependence of the specific heat indicates fully gapped superconductivity. Nevertheless, the upper critical field of this compound violates the Pauli limit. We argue that the high upper critical field is ascribed to an antisymmetric spin–orbit coupling in the unique multilayer structure.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::980013cb80e69e67862bcc92605eb24b https://doi.org/10.1021/acs.inorgchem.9b01825 Zobrazit plný text záznamu