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Cited by 39Topological Materials and PhenomenaHigh Entropy Alloys StudiesPhysics of Superconductivity and Magnetism

Discovery of the High‐Entropy Carbide Ceramic Topological Superconductor Candidate (Ti0.2Zr0.2Nb0.2Hf0.2Ta0.2)C

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Zeng, Lingyong, Wang, Zequan, Song, Jing, Lin, Gaoting, Guo, Ruixin, Luo, Si‐Chun, Guo, Shu, Li, Kuan +6 more·2023·Advanced Functional Materials
DOI 10.1002/adfm.202301929
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Abstract

High‐entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near‐equal atomic ratios of multi‐principal elements. Material design and property tailoring possibilities emerge from this new class of materials. Herein, the discovery of superconductivity 2.35 K and topological properties in the (Ti 0.2 Zr 0.2 Nb 0.2 Hf 0.2 Ta 0.2)C high‐entropy carbide ceramic (HECC) is reported, which is not observed before in any of the investigated HECC. Density functional theory calculations show that six type‐II Dirac points exist in (Ti 0.2 Zr 0.2 Nb 0.2 Hf 0.2 Ta 0.2)C, which mainly contributed from the t2g orbitals of transition metals and the p orbitals of C. Due to the stability of the structure, robust superconductivity (SC) under pressure in this HEC superconductor is also observed. This study expands the physical properties of HECs, which may become a new material platform for SC research, especially for studying the coupling between SC and topological physics.

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  • Topological properties are reported in many high-entropy carbide superconductors.

    “Currently, topological properties are reported in many high-entropy carbide superconductors 44 -46 .”

    From Recent advances in high-entropy superconductors (2024) · cites this paper as [44]

    The Abstract reports topological properties in one high-entropy carbide superconductor, (Ti₀.₂Zr₀.₂Nb₀.₂Hf₀.₂Ta₀.₂)C, and says they had not previously been observed in the investigated high-entropy carbide ceramics. The Introduction likewise says there were no prior reports of superconductivity in such ceramics; its examples of other topological carbides are binary compounds, not high-entropy carbides. (LLM, conf=0.88)

    Checked by a reasoning model — may be wrong.

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  • The specific heat jump value is close to the theoretical BCS value of 1.43.

    “The speci fi c heat jump value is close to the theoretical BCS value of 1.43.”

    From Recent advances in high-entropy superconductors (2024) · cites this paper as [44]

    The Experimental Section (page unavailable) reports a normalized heat-capacity jump of 1.25, which is reasonably close to 1.43. Our copy does not identify 1.43 as the theoretical BCS value, so that part of the attributed comparison is not established by this source. (LLM, conf=0.83)

    Experimental — accuracy not yet measured

  • The discovered high-entropy carbide superconductors are type II superconductors, with μ0Hc2(0) values between 0.5 and 5 T.

    “The discovered high-entropy carbide superconductors are type II superconductors, with μ 0Hc2(0) values between 0.5 and 5 T.”

    From Recent advances in high-entropy superconductors (2024) · cites this paper as [44]

    The Experimental Section (page unavailable) reports upper critical fields of 0.39 T and 0.51 T, depending on the calculation, for one high-entropy carbide. Thus one estimate falls within the claimed 0.5–5 T range, but the other falls below it, and the paper does not establish that range for multiple carbide superconductors. The copy mentions type-II Dirac points, not an explicit classification of the carbide as a type-II superconductor. (LLM, conf=0.88)

    Experimental — accuracy not yet measured

  • The observed increase in Tc in NaCl-type high-entropy carbide superconductors is relatively less pronounced than that in crystalline alloys, exhibiting a monotonically increasing trend akin to that observed in amorphous superconductors.

    “The observed increase in T c in NaCl-type high-entropy carbide superconductors is relatively less pronounced than that in crystalline alloys, exhibiting a monotonically increasing trend akin to that observed in amorphous superconductors.”

    From Recent advances in high-entropy superconductors (2024) · cites this paper as [44]

    The Results and Discussion (page unavailable) report that Tc rises from non-superconducting carbides at 4 electrons per atom to 2.35 K for the studied high-entropy carbide at 4.2. The paper does not establish that this increase is smaller than in crystalline alloys or follows an amorphous-like monotonic trend; it reports that Tc decreases above 4.8 electrons per atom in related NaCl-type compounds. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

  • Experimental evidence has indicated that the VEC of HEA and HEC superconductors is critical in determining their superconducting Tc and material stability.

    “Experimental evidence has indicated that the VEC of HEA and HEC superconductors is critical in determining their superconducting T c and material stability.”

    From Recent advances in high-entropy superconductors (2024) · cites this paper as [44]

    The Introduction reports a strong correlation between VEC and Tc in a specified HEA system and proposes studying that relationship in high-entropy carbides. The Results and Discussion mention lattice instability near 4.8 electrons per atom in pseudo-binary systems, but attribute improved stability in high-entropy carbides to configurational entropy. The paper does not establish that VEC determines both Tc and material stability across HEA and HEC superconductors. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Authors
Zeng, L., Wang, Z., Song, J., Lin, G., Guo, R., Luo, S., Guo, S., Li, K., Yu, P., Zhang, C., Guo, W., Ma, J., Hou, Y., & Luo, H.
Affiliations
  • Sun Yat-sen University (CN)
  • Chinese Academy of Sciences (CN)
  • Shanghai Jiao Tong University (CN)
  • Southern University of Science and Technology (CN)
  • Guangdong University of Technology (CN)
Corresponding author
  • Hou, Yusheng
  • Luo, Huixia
ORCID
Venue
Advanced Functional Materials
Publisher
Wiley
Published
2023-05-31
Volume
33
Issue
40
ISSN
  • 1616-301X (ISSN-L)
  • 1616-3028
DOI
10.1002/adfm.202301929
OpenAlex
W4378983455
Semantic Scholar
75cfe4731742f0752394b2f8da97024d3fd5323d
Cited by
39
References
53
Citations by year
2026: 7 · 2025: 17 · 2024: 11 · 2023: 4
FWCI
4.53
Type
journal article
Language
en
Open access
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations
Advanced Functional Materials (publishedVersion)
Funders
National Natural Science Foundation of China (12274471, 11922415, 12104518, 22205091, 12204514)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Engineering › Mechanical Engineering › High Entropy Alloys Studies
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
Keywords
high-entropy carbide ceramics, topological superconductivity, superconductivity, high-pressure superconductivity, transition metal carbides, t2g orbitals, density functional theory

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