Oxidation annealing effects on the spin-glass-like magnetism and appearance of superconductivity in T*-type La1−x=2Eu1−x=2SrxCuO4 (0.14 ≤ x ≤ 0.28)

Shun Asano, Kensuke M. Suzuki, Kota Kudo, Isao Watanabe, Akihiro Koda, Ryosuke Kadono, Takashi Noji, Yoji Koike, Takanori Taniguchi, Shunsaku Kitagawa, Kenji Ishida, Masaki Fujita

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Abstract

We investigated the magnetism and superconductivity in as-sintered (AS) and oxidation annealed (OA) T+-type La1−x=2Eu1−x=2SrxCuO4 (LESCO) with 0.14 ≤ x ≤ 0.28 by the first comprehensive muon spin rotation=relaxation (μSR), magnetic susceptibility, and electrical resistivity measurements. In OA superconducting samples, no evidence of magnetic order was observed, whereas AS semiconducting samples exhibited evidence of a disordered magnetic state in the measured temperature range between ∼4 and ∼8 K. Therefore, the ground state in LESCO drastically varies with oxidation annealing and the magnetic phase competitively exists with the superconducting (SC) phase. The magnetic phase in the AS LESCO is quite robust against Sr doping, while the SC phase degrades with increasing x. A monotonous decrease of the SC transition temperature from 24.5 K in x = 0.14 to 9.0 K in x = 0.28 suggests the disappearance of the SC phase at x ∼ 0.34. Furthermore, we clarified the simultaneous development of (quasi) static magnetism and the electrical resistivity at a low temperature in AS samples, suggesting the inducement of magnetism by the suppression of carrier mobility. The variation in magnetism due to annealing is discussed from a viewpoint of structural defects, which was previously reported from neutron diffraction measurements.

Original languageEnglish
Article number084709
Journaljournal of the physical society of japan
Volume88
Issue number8
DOIs
Publication statusPublished - 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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