Thermal-driven gigantic enhancement in critical current density of high-entropy alloy superconductors

Jihyun Kim; Soon Gil Jung; Yoonseok Han; Jin Hee Kim; Jong Soo Rhyee; Sunmog Yeo; Tuson Park

doi:10.1016/j.jmst.2023.11.040

Thermal-driven gigantic enhancement in critical current density of high-entropy alloy superconductors

Jihyun Kim
, Soon Gil Jung
, Yoonseok Han
, Jin Hee Kim
, Jong Soo Rhyee
, Sunmog Yeo
, Tuson Park

Department of Physics

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

18 Scopus citations

Abstract

The high-entropy alloy (HEA) superconductor, Ta_1/6Nb_2/6Hf_1/6Zr_1/6Ti_1/6 (Ta–Nb–Hf–Zr–Ti), is systematically studied to examine changes in superconducting critical properties, critical temperature (T_c), critical current density (J_c), and upper critical field (H_c2), concerning thermal treatment conditions. Annealing condition affects J_c more significantly than T_c and H_c2, with a large improvement of flux pinning force density (F_p). The J_c of bare sample is reduced to 10 A cm^–2 at an applied magnetic field of approximately 1.5 T, whereas the sample annealed at 550 °C for 12 h exhibits J_c > 100 kA cm^–2 up to around 4 T. Furthermore, the Vickers hardness (HV_IT) of the Ta–Nb–Hf–Zr–Ti HEA superconductor notably increases from ∼384 to 528 HV_IT following a 24-h annealing at 500 °C. These results demonstrate that thermal annealing is a powerful process to optimize both the superconducting and mechanical properties of high-entropy alloy superconductors.

Original language	English
Pages (from-to)	60-67
Number of pages	8
Journal	Journal of Materials Science and Technology
Volume	189
DOIs	https://doi.org/10.1016/j.jmst.2023.11.040
State	Published - 1 Aug 2024

Keywords

Annealing
Critical current density
Hardness
High-entropy alloy superconductor
Ta–Nb–Hf–Zr–Ti

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10.1016/j.jmst.2023.11.040

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title = "Thermal-driven gigantic enhancement in critical current density of high-entropy alloy superconductors",

abstract = "The high-entropy alloy (HEA) superconductor, Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 (Ta–Nb–Hf–Zr–Ti), is systematically studied to examine changes in superconducting critical properties, critical temperature (Tc), critical current density (Jc), and upper critical field (Hc2), concerning thermal treatment conditions. Annealing condition affects Jc more significantly than Tc and Hc2, with a large improvement of flux pinning force density (Fp). The Jc of bare sample is reduced to 10 A cm–2 at an applied magnetic field of approximately 1.5 T, whereas the sample annealed at 550 °C for 12 h exhibits Jc > 100 kA cm–2 up to around 4 T. Furthermore, the Vickers hardness (HVIT) of the Ta–Nb–Hf–Zr–Ti HEA superconductor notably increases from ∼384 to 528 HVIT following a 24-h annealing at 500 °C. These results demonstrate that thermal annealing is a powerful process to optimize both the superconducting and mechanical properties of high-entropy alloy superconductors.",

keywords = "Annealing, Critical current density, Hardness, High-entropy alloy superconductor, Ta–Nb–Hf–Zr–Ti",

author = "Jihyun Kim and Jung, \{Soon Gil\} and Yoonseok Han and Kim, \{Jin Hee\} and Rhyee, \{Jong Soo\} and Sunmog Yeo and Tuson Park",

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doi = "10.1016/j.jmst.2023.11.040",

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AU - Kim, Jihyun

AU - Jung, Soon Gil

AU - Han, Yoonseok

AU - Kim, Jin Hee

AU - Rhyee, Jong Soo

AU - Yeo, Sunmog

AU - Park, Tuson

PY - 2024/8/1

Y1 - 2024/8/1

N2 - The high-entropy alloy (HEA) superconductor, Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 (Ta–Nb–Hf–Zr–Ti), is systematically studied to examine changes in superconducting critical properties, critical temperature (Tc), critical current density (Jc), and upper critical field (Hc2), concerning thermal treatment conditions. Annealing condition affects Jc more significantly than Tc and Hc2, with a large improvement of flux pinning force density (Fp). The Jc of bare sample is reduced to 10 A cm–2 at an applied magnetic field of approximately 1.5 T, whereas the sample annealed at 550 °C for 12 h exhibits Jc > 100 kA cm–2 up to around 4 T. Furthermore, the Vickers hardness (HVIT) of the Ta–Nb–Hf–Zr–Ti HEA superconductor notably increases from ∼384 to 528 HVIT following a 24-h annealing at 500 °C. These results demonstrate that thermal annealing is a powerful process to optimize both the superconducting and mechanical properties of high-entropy alloy superconductors.

AB - The high-entropy alloy (HEA) superconductor, Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6 (Ta–Nb–Hf–Zr–Ti), is systematically studied to examine changes in superconducting critical properties, critical temperature (Tc), critical current density (Jc), and upper critical field (Hc2), concerning thermal treatment conditions. Annealing condition affects Jc more significantly than Tc and Hc2, with a large improvement of flux pinning force density (Fp). The Jc of bare sample is reduced to 10 A cm–2 at an applied magnetic field of approximately 1.5 T, whereas the sample annealed at 550 °C for 12 h exhibits Jc > 100 kA cm–2 up to around 4 T. Furthermore, the Vickers hardness (HVIT) of the Ta–Nb–Hf–Zr–Ti HEA superconductor notably increases from ∼384 to 528 HVIT following a 24-h annealing at 500 °C. These results demonstrate that thermal annealing is a powerful process to optimize both the superconducting and mechanical properties of high-entropy alloy superconductors.

KW - Annealing

KW - Critical current density

KW - Hardness

KW - High-entropy alloy superconductor

KW - Ta–Nb–Hf–Zr–Ti

UR - https://www.scopus.com/pages/publications/85184041076

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DO - 10.1016/j.jmst.2023.11.040

M3 - Article

AN - SCOPUS:85184041076

SN - 1005-0302

VL - 189

SP - 60

EP - 67

JO - Journal of Materials Science and Technology

JF - Journal of Materials Science and Technology

ER -

Thermal-driven gigantic enhancement in critical current density of high-entropy alloy superconductors

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