Superconducting ground state and electronic properties of σ-Phase Ta–W–Mo-Re-Os high entropy alloys

Manikandan Krishnan; Jiao Jiao Meng; Bai Zhuo Li; Yanmei Ma; Cao Wang; Dilip Bhoi; Yoshiya Uwatoko; Qiang Jing; Bo Liu

doi:10.1016/j.jpcs.2025.112630

Superconducting ground state and electronic properties of σ-Phase Ta–W–Mo-Re-Os high entropy alloys

Manikandan Krishnan
, Jiao Jiao Meng
, Bai Zhuo Li
, Yanmei Ma
, Cao Wang
, Dilip Bhoi
, Yoshiya Uwatoko
, Qiang Jing
, Bo Liu

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

We report on a new member of superconducting high entropy alloys, Ta₇W_10+xMo_30-xRe₃₃Os₂₀, 0≤x ≤ 12 (σ-phase), which was synthesized and its superconducting properties were investigated. It was found that bulk superconductivity with a maximum T_c of 5.9 K observed at x = 0. The superconducting T_c decreases with the increase of x, which is directly associated with a reduction in electron-phonon interactions. At low temperatures, the specific heat demonstrates the presence of conventional, fully gapped superconductivity with weak coupling. The collective pinning of vortices is more dominant because point defects play a significant role, as observed from the thermally activated flux flow behaviour. The electronic parameters in these compounds fall within a conventional range on the Uemura plot, suggesting that σ-phase high entropy alloys have a conventional superconducting ground state.

Original language	English
Article number	112630
Journal	Journal of Physics and Chemistry of Solids
Volume	202
DOIs	https://doi.org/10.1016/j.jpcs.2025.112630
State	Published - Jul 2025
Externally published	Yes

Funding

The authors express gratitude to Shandong University of Technology, Zibo, Shandong for providing the post-doctoral fellowship. The authors acknowledge Institute of solid-State physics, The University of Tokyo for providing the low-temperature facilities during the short-term visit. This work was supported by the Natural Science Foundation of Shandong Province, China (ZR2023MF035, ZR2022ME010). The authors express gratitude to Shandong University of Technology, Zibo, Shandong for providing the post-doctoral fellowship. The authors acknowledge Institute of solid-State physics, The University of Tokyo for providing the low-temperature facilities during the short-term visit. The authors acknowledge the Natural Science Foundation of Shandong Province, China (ZR2023MF035, ZR2022ME010).

Keywords

High entropy alloys
Superconductivity
Thermal activation flux flow
Uemura plot
Valence electron concentration
σ-phase structure

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10.1016/j.jpcs.2025.112630

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title = "Superconducting ground state and electronic properties of σ-Phase Ta–W–Mo-Re-Os high entropy alloys",

abstract = "We report on a new member of superconducting high entropy alloys, Ta7W10+xMo30-xRe33Os20, 0≤x ≤ 12 (σ-phase), which was synthesized and its superconducting properties were investigated. It was found that bulk superconductivity with a maximum Tc of 5.9 K observed at x = 0. The superconducting Tc decreases with the increase of x, which is directly associated with a reduction in electron-phonon interactions. At low temperatures, the specific heat demonstrates the presence of conventional, fully gapped superconductivity with weak coupling. The collective pinning of vortices is more dominant because point defects play a significant role, as observed from the thermally activated flux flow behaviour. The electronic parameters in these compounds fall within a conventional range on the Uemura plot, suggesting that σ-phase high entropy alloys have a conventional superconducting ground state.",

keywords = "High entropy alloys, Superconductivity, Thermal activation flux flow, Uemura plot, Valence electron concentration, σ-phase structure",

author = "Manikandan Krishnan and Meng, \{Jiao Jiao\} and Li, \{Bai Zhuo\} and Yanmei Ma and Cao Wang and Dilip Bhoi and Yoshiya Uwatoko and Qiang Jing and Bo Liu",

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year = "2025",

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doi = "10.1016/j.jpcs.2025.112630",

language = "English",

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T1 - Superconducting ground state and electronic properties of σ-Phase Ta–W–Mo-Re-Os high entropy alloys

AU - Krishnan, Manikandan

AU - Meng, Jiao Jiao

AU - Li, Bai Zhuo

AU - Ma, Yanmei

AU - Wang, Cao

AU - Bhoi, Dilip

AU - Uwatoko, Yoshiya

AU - Jing, Qiang

AU - Liu, Bo

PY - 2025/7

Y1 - 2025/7

N2 - We report on a new member of superconducting high entropy alloys, Ta7W10+xMo30-xRe33Os20, 0≤x ≤ 12 (σ-phase), which was synthesized and its superconducting properties were investigated. It was found that bulk superconductivity with a maximum Tc of 5.9 K observed at x = 0. The superconducting Tc decreases with the increase of x, which is directly associated with a reduction in electron-phonon interactions. At low temperatures, the specific heat demonstrates the presence of conventional, fully gapped superconductivity with weak coupling. The collective pinning of vortices is more dominant because point defects play a significant role, as observed from the thermally activated flux flow behaviour. The electronic parameters in these compounds fall within a conventional range on the Uemura plot, suggesting that σ-phase high entropy alloys have a conventional superconducting ground state.

AB - We report on a new member of superconducting high entropy alloys, Ta7W10+xMo30-xRe33Os20, 0≤x ≤ 12 (σ-phase), which was synthesized and its superconducting properties were investigated. It was found that bulk superconductivity with a maximum Tc of 5.9 K observed at x = 0. The superconducting Tc decreases with the increase of x, which is directly associated with a reduction in electron-phonon interactions. At low temperatures, the specific heat demonstrates the presence of conventional, fully gapped superconductivity with weak coupling. The collective pinning of vortices is more dominant because point defects play a significant role, as observed from the thermally activated flux flow behaviour. The electronic parameters in these compounds fall within a conventional range on the Uemura plot, suggesting that σ-phase high entropy alloys have a conventional superconducting ground state.

KW - High entropy alloys

KW - Superconductivity

KW - Thermal activation flux flow

KW - Uemura plot

KW - Valence electron concentration

KW - σ-phase structure

UR - https://www.scopus.com/pages/publications/86000171837

U2 - 10.1016/j.jpcs.2025.112630

DO - 10.1016/j.jpcs.2025.112630

M3 - Article

AN - SCOPUS:86000171837

SN - 0022-3697

VL - 202

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

M1 - 112630

ER -

Superconducting ground state and electronic properties of σ-Phase Ta–W–Mo-Re-Os high entropy alloys

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