Stoichiometry Effects on the Chemical Ordering and Superconducting Properties in TiZrTaNbNx Refractory High Entropy Nitrides
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High‐entropy materials, an exciting new class of structural materials involving five or more elements, are emerging as unexplored ground for superconductors. Here, the effects of nitrogen stoichiometry are investigated on local chemical structure of TiZrNbTa‐based thin films by various X‐ray‐based techniques. Lattice distortion and short‐range order of a set of TiZrNbTaN x samples, including bond lengths of different atomic pairs and coordination numbers of substituting atoms are quantitatively studied. The maximum superconducting transition temperature T c is found at 10 K for a near‐stoichiometric (TiZrNbTa)N 1.08 film, which is >8 K measured for a metallic TiZrNbTa film. The underlying electronic structure and chemical bonding in these high entropy nitrides thus influence the superconducting macroscopic properties.
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High μ0Hc2(0) values that surpass the Pauli paramagnetic field are observed in the TiNbMoTaWNx system.
“High μ 0Hc2(0) values that surpass the Pauli paramagnetic fi eld are also observed in this system.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [104]
The Results and Discussion section reports extrapolated zero-temperature upper critical fields of 13.7 and 13.5 T, but for TiZrNbTa-based films, not TiNbMoTaWNx. Our copy does not compare those fields with the Pauli paramagnetic field, so it does not support the claimed exceedance. (LLM, conf=0.82)
Experimental — accuracy not yet measuredSuperconductivity in these HEA nitride films is bulky in nature, confirmed by point-contact spectroscopy and heat capacity measurements.
“Further investigations via pointcontact spectroscopy and heat capacity measurements con fi rmed that the superconductivity in these HEA nitride fi lms is bulky in nature.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [104]
The Results and Discussion section reports superconducting transitions in the films based on resistivity and magnetotransport measurements. It does not report point-contact spectroscopy or heat-capacity measurements, so it does not support the claim that those methods confirmed the superconductivity was bulk in nature. (LLM, conf=0.84)
Experimental — accuracy not yet measuredTiNbMoTaWNx HEA films have a dome-shaped Tc on x, with the highest Tc reaching approximately 5 K at an optimal x value of 0.74, where Tc is 0.6 K for x = 0 and 1 K for x = 0.97.
“The TiNbMoTaWN x HEA fi lms have a dome-shaped T c on x , with the highest T c reaching approximately 5 K at an optimal x value of 0.74, where T c is 0.6 K for x = 0 and 1 K for x = 0.97.”
From Recent advances in high-entropy superconductors (2024) · cites this paper as [104]
The Results and Discussion section reports superconductivity for TiZrNbTaNₓ films, including a maximum Tc of 10 K at x = 1.08 and approximately 8 K at x = 0. Those measurements concern a different composition and do not contradict the claim about TiNbMoTaWNₓ. Searches for TiNbMoTaW, x = 0.74 and 0.97, and the claimed Tc values found no passage addressing that system. (LLM, conf=0.77)
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- Authors
- Shu, R., Zhang, X., Tasnádi, F., Olovsson, W., Rao, S. G., Greczynski, G., le Febvrier, A., Magnuson, M., & Eklund, P.
- Affiliations
- Linköping University (SE)
- Chinese Academy of Sciences (CN)
- Thin Film Physics Division Department of Physics Chemistry, and Biology (IFM) Linköping University Linköping SE‐581 83 Sweden
- Corresponding author
- Shu, Rui
- Eklund, Per
- Venue
- Annalen der Physik
- Publisher
- Wiley
- Published
- 2023-12-20
- Volume
- 536
- Issue
- 5
- ISSN
- 0003-3804 (ISSN-L)
- 1521-3889
- OpenAlex
- W4389988291
- Cited by
- 7
- References
- 47
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 2
- FWCI
- 0.69
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Annalen der Physik (publishedVersion, cc-by)
- KTH Publication Database DiVA (KTH Royal Institute of Technology) (submittedVersion, other-oa)
- Uppsala University Publications (Uppsala University) (submittedVersion, other-oa)
- Funders
- Svenska Forskningsrådet Formas (2019‐02496)
- Carl Tryggers Stiftelse för Vetenskaplig Forskning (CTS23:2746, CTS20:272, CTS16:303, CTS14:310)
- Energimyndigheten (43606‐1)
- Stiftelsen för Strategisk Forskning (RIF14‐0053)
- Vetenskapsrådet (2022‐06725)
- Knut och Alice Wallenbergs Stiftelse (KAW‐2020.0196)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › High Entropy Alloys Studies
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
- Physical Sciences › Chemistry › Inorganic Chemistry › Inorganic Chemistry and Materials
- Keywords
- high-entropy nitrides, nitrogen stoichiometry, superconductivity, superconducting transition temperature, atomic ordering, short-range order, lattice distortion, bond lengths, coordination number, thin films, electronic structure, chemical bonding
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