In:
Chinese Physics Letters, IOP Publishing, Vol. 39, No. 12 ( 2022-11-01), p. 127401-
Abstract:
Recently, by intercalating organic ions into bulk FeSe superconductors, two kinds of layered FeSe-based superconductors [(TBA) x FeSe and (CTA) x FeSe] with superconducting transition temperatures ( T c ) above 40 K have been discovered. Due to the large interlayer distance (∼ 15 Å), these new layered superconductors have a large resistivity anisotropy analogous to bismuth-based cuprate superconductors. Moreover, remarkable pseudogap behavior well above T c is revealed by nuclear magnetic resonance (NMR) measurements on 77 Se nuclei, suggesting a preformed pairing scenario similar to that of cuprates. Here, we report another new kind of organic-ion-intercalated FeSe superconductor, (PY) x FeSe, with a reduced interlayer distance (∼ 10 Å) compared to (TBA) x FeSe and (CTA) x FeSe. By performing 77 Se NMR and transport measurements, we observe a similar pseudogap behavior well above T c of ∼ 40 K and a large resistivity anisotropy of ∼10 4 in (PY) x FeSe. All these facts strongly support a universal pseudogap behavior in these layered FeSe-based superconductors with quasi-two-dimensional electronic structures.
Type of Medium:
Online Resource
ISSN:
0256-307X
,
1741-3540
DOI:
10.1088/0256-307X/39/12/127401
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2022
detail.hit.zdb_id:
2040565-0
SSG:
6,25
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