Hydrostatic pressure effects on superconducting properties of the noncentrosymmetric high-entropy alloy (HfNb)0.10 (MoRuRe)0.90

Sathiskumar Mariappan; Dilip Bhoi; Thiagarajan Maran; Kapil Motla; R. P. Singh; Alka B. Garg; Arumugam Sonachalam; Yoshiya Uwatoko

doi:10.1088/1361-6668/ae011d

Hydrostatic pressure effects on superconducting properties of the noncentrosymmetric high-entropy alloy (HfNb)_0.10 (MoRuRe)_0.90

Sathiskumar Mariappan, Dilip Bhoi, Thiagarajan Maran, Kapil Motla, R. P. Singh, Alka B. Garg, Arumugam Sonachalam, Yoshiya Uwatoko

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

Abstract

We investigate the effects of hydrostatic pressure on the superconducting properties of a noncentrosymmetric high-entropy alloy (HEA) (HfNb)_0.10(MoRuRe)_0.90. Temperature-dependent resistivity (ρ(T)) and magnetization measurements were performed under pressures to assess variations in the superconducting transition temperature (T_c), upper and lower critical fields, and critical current density (J_c). Increasing pressure up to 12 GPa resulted in minor changes in T_c (∼0.3 K) and normal-state resistivity (∼2 µΩ.m), highlighting the robustness of the superconducting state. The upper critical field, H_c₂(0), remained close to the Pauli limiting field, H_p(0), up to 2.9 GPa, and the Maki parameter α_M > 1 indicates significant Pauli pair-breaking effects. Thermally activated flux flow analysis in ρ(T, H) confirmed the coexistence of single and collective vortex states. At the same time, the lower critical field, critical current density (J_c), and pinning properties exhibited minimal changes in grain boundaries and pinning behavior up to 1.2 GPa. These findings highlight the stable superconducting nature of this HEA under high pressure, offering insights into potential high-pressure applications.

Original language	English
Article number	095006
Journal	Superconductor Science and Technology
Volume	38
Issue number	9
DOIs	https://doi.org/10.1088/1361-6668/ae011d
State	Published - Sep 1 2025
Externally published	Yes

Funding

Author S.M. thanks SERB for the financial support through N-PDF (PDF/2023/001429) and acknowledges ISSP, The University of Tokyo, Japan, for providing the experimental facilities during the visit and RUSA 2.0 for the fellowship. Author YU acknowledges the JSPS KAKENHI Grant Number JP19H00648. Author SA acknowledges RUSA 2.0, SERB, DAE-BRNS, and TANSCHE. R.P.S. acknowledges the Science and Engineering Research Board, Government of India, for Research Grant Nos. CRG/2019/001028.

Keywords

high entropy alloy
high-pressure effect
noncentrosymmetric compounds
robust superconductivity

Access to Document

10.1088/1361-6668/ae011d

Cite this

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title = "Hydrostatic pressure effects on superconducting properties of the noncentrosymmetric high-entropy alloy (HfNb)0.10 (MoRuRe)0.90",

abstract = "We investigate the effects of hydrostatic pressure on the superconducting properties of a noncentrosymmetric high-entropy alloy (HEA) (HfNb)0.10(MoRuRe)0.90. Temperature-dependent resistivity (ρ(T)) and magnetization measurements were performed under pressures to assess variations in the superconducting transition temperature (Tc), upper and lower critical fields, and critical current density (Jc). Increasing pressure up to 12 GPa resulted in minor changes in Tc (∼0.3 K) and normal-state resistivity (∼2 µΩ.m), highlighting the robustness of the superconducting state. The upper critical field, Hc2(0), remained close to the Pauli limiting field, Hp(0), up to 2.9 GPa, and the Maki parameter αM > 1 indicates significant Pauli pair-breaking effects. Thermally activated flux flow analysis in ρ(T, H) confirmed the coexistence of single and collective vortex states. At the same time, the lower critical field, critical current density (Jc), and pinning properties exhibited minimal changes in grain boundaries and pinning behavior up to 1.2 GPa. These findings highlight the stable superconducting nature of this HEA under high pressure, offering insights into potential high-pressure applications.",

keywords = "high entropy alloy, high-pressure effect, noncentrosymmetric compounds, robust superconductivity",

author = "Sathiskumar Mariappan and Dilip Bhoi and Thiagarajan Maran and Kapil Motla and Singh, \{R. P.\} and Garg, \{Alka B.\} and Arumugam Sonachalam and Yoshiya Uwatoko",

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T1 - Hydrostatic pressure effects on superconducting properties of the noncentrosymmetric high-entropy alloy (HfNb)0.10 (MoRuRe)0.90

AU - Mariappan, Sathiskumar

AU - Bhoi, Dilip

AU - Maran, Thiagarajan

AU - Motla, Kapil

AU - Singh, R. P.

AU - Garg, Alka B.

AU - Sonachalam, Arumugam

AU - Uwatoko, Yoshiya

PY - 2025/9/1

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N2 - We investigate the effects of hydrostatic pressure on the superconducting properties of a noncentrosymmetric high-entropy alloy (HEA) (HfNb)0.10(MoRuRe)0.90. Temperature-dependent resistivity (ρ(T)) and magnetization measurements were performed under pressures to assess variations in the superconducting transition temperature (Tc), upper and lower critical fields, and critical current density (Jc). Increasing pressure up to 12 GPa resulted in minor changes in Tc (∼0.3 K) and normal-state resistivity (∼2 µΩ.m), highlighting the robustness of the superconducting state. The upper critical field, Hc2(0), remained close to the Pauli limiting field, Hp(0), up to 2.9 GPa, and the Maki parameter αM > 1 indicates significant Pauli pair-breaking effects. Thermally activated flux flow analysis in ρ(T, H) confirmed the coexistence of single and collective vortex states. At the same time, the lower critical field, critical current density (Jc), and pinning properties exhibited minimal changes in grain boundaries and pinning behavior up to 1.2 GPa. These findings highlight the stable superconducting nature of this HEA under high pressure, offering insights into potential high-pressure applications.

AB - We investigate the effects of hydrostatic pressure on the superconducting properties of a noncentrosymmetric high-entropy alloy (HEA) (HfNb)0.10(MoRuRe)0.90. Temperature-dependent resistivity (ρ(T)) and magnetization measurements were performed under pressures to assess variations in the superconducting transition temperature (Tc), upper and lower critical fields, and critical current density (Jc). Increasing pressure up to 12 GPa resulted in minor changes in Tc (∼0.3 K) and normal-state resistivity (∼2 µΩ.m), highlighting the robustness of the superconducting state. The upper critical field, Hc2(0), remained close to the Pauli limiting field, Hp(0), up to 2.9 GPa, and the Maki parameter αM > 1 indicates significant Pauli pair-breaking effects. Thermally activated flux flow analysis in ρ(T, H) confirmed the coexistence of single and collective vortex states. At the same time, the lower critical field, critical current density (Jc), and pinning properties exhibited minimal changes in grain boundaries and pinning behavior up to 1.2 GPa. These findings highlight the stable superconducting nature of this HEA under high pressure, offering insights into potential high-pressure applications.

KW - high entropy alloy

KW - high-pressure effect

KW - noncentrosymmetric compounds

KW - robust superconductivity

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