Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr2VFeAsO3-δ, a superconductor

Tojo, Yujiro; Shibuya, Taizo; Nakamura, Tetsuro; Shoji, Koichiro; Fujioka, Hirotaka; Matoba, Masanori; Yasui, Shintaro; Itoh, Mitsuru; Iimura, Soshi; Hiramatsu, Hidenori; Hosono, Hideo; Hirai, Shigeto; Mao, Wendy; Kitao, Shinji; Seto, Makoto; Kamihara, Yoichi

doi:10.1088/1361-648x/aaf7e0

Title: Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr₂VFeAsO_3-δ, a superconductor

Journal Article · 22 January 2019 · Journal of Physics. Condensed Matter

DOI: https://doi.org/10.1088/1361-648x/aaf7e0 · OSTI ID:1502986

Tojo, Yujiro ^[1]; Shibuya, Taizo ^[2]; Nakamura, Tetsuro ^[1]; Shoji, Koichiro ^[1]; Fujioka, Hirotaka ^[1]; Matoba, Masanori ^[1]; Yasui, Shintaro ^[3]; Itoh, Mitsuru ^[3]; Iimura, Soshi ^[3];

^[3]; Hosono, Hideo ^[3]; Hirai, Shigeto ^[4]; Mao, Wendy ^[5]; Kitao, Shinji ^[6]; Seto, Makoto ^[6];

^[7]

Keio Univ., Yokohama (Japan)
Keio Univ., Yokohama (Japan); IoT Devices Research Lab., Tsukuba (Japan)
Tokyo Inst. of Technology, Yokohama (Japan). Lab.for Materials and Structures
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States); Kitami Inst. of Technology, Kitami (Japan)
Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States)
Kyoto Univ., Osaka (Japan)
Keio Univ., Yokohama (Japan)

We elucidate the magnetic phases and superconducting (SC) transition temperatures (T c) in Sr₂VFeAsO_3-δ(21113V), an iron-based superconductor with a thick-blocking layer fabricated from a perovskite-related transition metal oxide. At low temperatures (T<37.1 K), 21113V exhibited a SC phase in the range 0.031 ≤ δ ≤ 0.145 and an antiferromagnetic (AFM) iron sublattice in the range 0.267 ≤ δ ≤ 0.664. Mixed-valent vanadium exhibited a dominant AFM phase in 0.031 ≤ δ ≤ 0.088, and a partial ferrimagnetic (Ferri.) phase in the range 0.124 ≤ δ ≤ 0.664. The Ferri. phase was the most dominant at a δ value of 0.267, showing an AFM phase of Fe at T < 20 K. Increasing the spontaneous magnetic moments reduced the magnetic shielding volume fraction due to the SC phase. This result was attributed to the magnetic phase of vanadium, which dominates the superconductivity of Fe in 21113V. The T c–δ curve showed two maxima. Conclusively, the smaller and larger of T c maxima occurred at δ = 0.073 and δ = 0.145, respectively; the latter resides on the phase boundary between AFM and the partial Ferri. phases of vanadium. 21113V is a useful platform for verifing new mechanisms of T c enhancement in iron-based superconductors.

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Research Organization:: SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1502986

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 11 Vol. 31; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Local Magnetic States of the Weakly Ferromagnetic Iron-Based Superconductor Sr 2 VFeAsO 3−δ Studied by X-ray Magnetic Circular Dichroism Horio, Masafumi; Takeda, Yukiharu; Namiki, Hiromasa Journal of the Physical Society of Japan, Vol. 87, Issue 10 https://doi.org/10.7566/JPSJ.87.105001	journal	October 2018

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Sr2VFeAsO3
antiferromagnetism
iron-based superconductors
layered perovskite-type oxide
oxygen deficiency
phase diagram

Title: Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr2VFeAsO3-δ, a superconductor

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Title: Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr₂VFeAsO_3-δ, a superconductor