Preformed Cooper pairs in a triclinic iron pnictide superconductor

IF 6.4 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Science China Physics, Mechanics & Astronomy Pub Date : 2025-02-21 DOI:10.1007/s11433-024-2596-6

Zezhong Li, Wenshan Hong, Honglin Zhou, Xiaoyan Ma, Uwe Stuhr, Kaiyue Zeng, Long Ma, Ying Xiang, Huan Yang, Hai-Hu Wen, Jiangping Hu, Shiliang Li, Huiqian Luo

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引用次数: 0

Abstract

Electron pairing along with phase coherence generates superconductivity below the critical temperature (T_c). In underdoped high-T_c cuprates, these two quantum phenomena may occur at separate temperatures, which was lately confirmed in the quasi-two-dimensional (quasi-2D) iron chalcogenide superconductors. Here, we report a systematic investigation on the pre-pairing behavior in a triclinic iron pnictide superconductor (Ca_0.85La_0.15)₁₀(Pt₃As₈)(Fe₂As₂)₅ with T_c ≈ 30 K, where the superconductivity is quasi-2D manifested by the Berezinskii-Kosterlitz-Thouless behaviors. Inelastic neutron scattering experiments unambiguously reveal a spin resonance peak around E_R = 13 meV in the superconducting state, but its intensity continuously decreases when warming up across T_c, accompanied with an anomaly around T* ≈ 45 K in spin correlations, and a suppression by an in-plane magnetic field persisting to the same temperature. Below T*, a significant Nernst signal and a reduction of density of states at the Fermi level are also observed. These results suggest that the precursor of spin resonance is highly related to the preformed Cooper pairs driven by phase fluctuations, much like the pseudogap case in cuprates.

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来源期刊

Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-

CiteScore

10.30

自引率

6.20%

发文量

4047

审稿时长

3 months

期刊介绍： Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.