Stoichiometry Effects on the Chemical Ordering and Superconducting Properties in TiZrTaNbNx Refractory High Entropy NitridesShow others and affiliations
2024 (English)In: Annalen der Physik, ISSN 0003-3804, E-ISSN 1521-3889, Vol. 534, no 5, article id 2300470Article in journal (Refereed) Published
Abstract [en]
High-entropy materials, an exciting new class of structural materials involvingfive or more elements, are emerging as unexplored ground forsuperconductors. Here, the effects of nitrogen stoichiometry are investigatedon local chemical structure of TiZrNbTa-based thin films by variousX-ray-based techniques. Lattice distortion and short-range order of a set ofTiZrNbTaNxsamples, including bond lengths of different atomic pairs andcoordination numbers of substituting atoms are quantitatively studied. Themaximum superconducting transition temperature Tcis found at 10 K for anear-stoichiometric (TiZrNbTa)N1.08film, which is>8 K measured for ametallic TiZrNbTa film. The underlying electronic structure and chemicalbonding in these high entropy nitrides thus influence the superconductingmacroscopic properties.
Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2024. Vol. 534, no 5, article id 2300470
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-199850DOI: 10.1002/andp.202300470ISI: 001130119800001OAI: oai:DiVA.org:liu-199850DiVA, id: diva2:1822922
Note
Funding agencies: the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009 00971), the VINNOVA Competence Centre FunMat-II (grant no. 2016–05156), the Knut and Alice Wallenberg foundation through the Wallenberg Academy Fellows program (KAW-2020.0196), and the Swedish Research Council under project number 2021–03826. Financial support for the operation of the accelerator laboratory in Uppsala by VR-RFI (Contract No. 2017-00646_9) and the Swedish Foundation for Strategic Research (SSF, Contract No. RIF14-0053), the Swedish Energy Research (Grant No.43606-1) and the CarlTryggers Foundation (CTS23:2746, CTS20:272, CTS16:303, CTS14:310).The authors acknowledge the MAX IV Laboratory for beamtime on the BALDER beamline for proposal 20200219. Research conducted at MAX IV, a Swedish national user facility, was supported by the Swedish Research council under contract 2018–07152, the Swedish Governmental Agency for Innovation Systems (VINNOVA) under contract 2018–04969, and Formas under contract 2019–02496.
2023-12-282023-12-282024-10-10Bibliographically approved