@article{c3b853bb2f9f4361a41a06095baa1bcb,
title = " Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr 2 VFeAsO 3-δ , a superconductor ",
abstract = " We elucidate the magnetic phases and superconducting (SC) transition temperatures (T c ) in Sr 2 VFeAsO 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 c 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. 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.",
keywords = "Sr VFeAsO, antiferromagnetism, iron-based superconductors, layered perovskite-type oxide, oxygen deficiency, phase diagram",
author = "Yujiro Tojo and Taizo Shibuya and Tetsuro Nakamura and Koichiro Shoji and Hirotaka Fujioka and Masanori Matoba and Shintaro Yasui and Mitsuru Itoh and Soshi Iimura and Hidenori Hiramatsu and Hideo Hosono and Shigeto Hirai and Wendy Mao and Shinji Kitao and Makoto Seto and Yoichi Kamihara",
note = "Funding Information: This work was supported by the research grant of Keio University, the Sumitomo foundation, and the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) through the Element Strategy Initiative to Form Core Research Center. This work used the facilities of the Institute for Integrated Radiation and Nuclear Science, Kyoto University, and was supported in part by the Collaborative Research Project of Laboratory for Materials and Structures, Tokyo Institute of Technology. We thank D Ikuta for help with the XRD experiments. This research was partially funded by the US Department of Energy (DOE), Office of Basic Energy Sciences (BES). SH and WLM are supported by DOE, Office of Basic Energy Sciences (BES), Division of Materials Sciences and Engineering, under Contact No. DE-AC02-76SF00515. H Hi was also supported by the Japan Society for the Promotion of Science (JSPS) through a Grant-in-Aid for Scientific Research on Innovative Areas {\textquoteleft}Nano Informatics{\textquoteright} (Grant Number 25106007), a Grant-in-Aid for Scientific Research (A) (grant no. 17H01318) and Support for Tokyotech Advanced Research (STAR). YK was also supported by the JSPS through a Grant-in-Aid for Scientific Research (A) (grant no. 15H01998), (B) (grant no. 17H03239, 18H01163), and Core-to-Core Program {\textquoteleft}Isotope spintronics{\textquoteright}. Publisher Copyright: {\textcopyright} 2019 IOP Publishing Ltd.",
year = "2019",
month = jan,
day = "23",
doi = "10.1088/1361-648X/aaf7e0",
language = "English",
volume = "31",
journal = "Journal of Physics Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing Ltd.",
number = "11",
}