Quadrupling the depairing current density in the iron-based superconductor SmFeAsO1–xHx

Miura, Masashi; Eley, Serena; Iida, Kazumasa; Hanzawa, Kota; Matsumoto, Jumpei; Hiramatsu, Hidenori; Ogimoto, Yuki; Suzuki, Takumi; Kobayashi, Tomoki; Ozaki, Toshinori; Kurokawa, Hodaka; Sekiya, Naoto; Yoshida, Ryuji; Kato, Takeharu; Okada, Tatsunori; Okazaki, Hiroyuki; Yamaki, Tetsuya; Hänisch, Jens; Awaji, Satoshi; Maeda, Atsutaka; Maiorov, Boris; Hosono, Hideo

doi:10.1038/s41563-024-01952-7

Title: Quadrupling the depairing current density in the iron-based superconductor SmFeAsO1–xHx

Journal Article · 18 July 2024 · Nature Materials

DOI: https://doi.org/10.1038/s41563-024-01952-7 · OSTI ID:2404454

;

; Hanzawa, Kota; Matsumoto, Jumpei; Hiramatsu, Hidenori;

;

; Ozaki, Toshinori; Kurokawa, Hodaka; Sekiya, Naoto;

; Kato, Takeharu;

; Okazaki, Hiroyuki; Yamaki, Tetsuya;

; Awaji, Satoshi; Maeda, Atsutaka more »

Abstract Iron-based 1111-type superconductors display high critical temperatures and relatively high critical current densities J _c . The typical approach to increasing J _c is to introduce defects to control dissipative vortex motion. However, when optimized, this approach is theoretically predicted to be limited to achieving a maximum J _c of only ∼30% of the depairing current density J _d , which depends on the coherence length and the penetration depth. Here we dramatically boost J _c in SmFeAsO _{1– x} H _x films using a thermodynamic approach aimed at increasing J _d and incorporating vortex pinning centres. Specifically, we reduce the penetration depth, coherence length and critical field anisotropy by increasing the carrier density through high electron doping using H substitution. Remarkably, the quadrupled J _d reaches 415 MA cm ^–2 , a value comparable to cuprates. Finally, by introducing defects using proton irradiation, we obtain high J _c values in fields up to 25 T. We apply this method to other iron-based superconductors and achieve a similar enhancement of current densities.

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Sponsoring Organization:: USDOE

OSTI ID:: 2404454

Journal Information:: Nature Materials, Journal Name: Nature Materials Journal Issue: 10 Vol. 23; ISSN 1476-1122

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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