Synthesis of large FeSe superconductor crystals via ion release/introduction and property characterization

• 作者: 倪顺利 周放 周花雪 张广铭 毛义元 胡卫 苑冬娜 董晓莉 袁洁 金魁 黄裕龙
• 来源期刊: 中国物理B（英文版）
• 关键词: FeSe superconductor hydrothermal growth via ion release/introduction upper critical field spin frustrations
• 年，卷（期）: 2016,（7）
• 页码范围: 077401-1-077401-4
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/25/7/077404

摘要

Large superconducting FeSe crystals of (001) orientation have been prepared via a hydrothermal ion re-lease/introduction route for the first time. The hydrothermally derived FeSe crystals are up to 10 mm×5 mm×0.3 mm in dimension. The pure tetragonal FeSe phase has been confirmed by x-ray diffraction (XRD) and the composition de-termined by both inductively coupled plasma atomic emission spectroscopy (ICP-AES) and energy dispersive x-ray spec-troscopy (EDX). The superconducting transition of the FeSe samples has been characterized by magnetic and transport measurements. The zero-temperature upper critical field Hc2 is calculated to be 13.2–16.7 T from a two-band model. The normal-state cooperative paramagnetism is found to be predominated by strong spin frustrations below the characteris-tic temperature Tsn, where the Ising spin nematicity has been discerned in the FeSe superconductor crystals as reported elsewhere.