Extracting intrinsic superconducting properties in intercalated layered superconductors using an extended 2D Tinkham model

Yue Liu; Yuhang Zhang; Zouyouwei Lu; Dong Li; Yuki M. Itahashi; Zhanyi Zhao; Jiali Liu; Jihu Lu; Feng Wu; Kui Jin; Hua Zhang; Ziyi Liu; Xiaoli Dong; Zhongxian Zhao

doi:10.1103/PhysRevMaterials.9.L041001

Extracting intrinsic superconducting properties in intercalated layered superconductors using an extended 2D Tinkham model

Yue Liu, Yuhang Zhang, Zouyouwei Lu, Dong Li, Yuki M. Itahashi, Zhanyi Zhao, Jiali Liu, Jihu Lu, Feng Wu, Kui Jin, Hua Zhang, Ziyi Liu, Xiaoli Dong, Zhongxian Zhao

DOI 10.1103/PhysRevMaterials.9.L041001 · Physical Review Materials

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Bulk two-dimensional (2D) superconductivity has gained considerable attention due to its intricate interplay between symmetry breaking, nontrivial topology, 2D phase fluctuations, and unconventional superconductivity. However, certain intercalated layered superconductors, despite their short c-axis superconducting coherence length, have been misclassified as anisotropic three-dimensional (3D) superconductors. Here, we investigate (Li,Fe)OHFeSe superconductors with varying degrees of interlayer misalignment, revealing sample-dependent superconducting dimensionality while consistently observing Berezinskii–Kosterlitz–Thouless (BKT) transitions. To resolve this discrepancy, we develop an extended 2D Tinkham model that quantitatively captures the blurring effects induced by interlayer misalignment. We further demonstrate the validity of this model in both (Li,Fe)OHFeSe and cetyltrimethyl ammonium (CTA+)-intercalated (CTA)0.5SnSe2 superconductors, highlighting its broad applicability. This work provides valuable insights into bulk 2D superconductivity and establishes an extended 2D Tinkham model for quantitatively extracting intrinsic superconducting properties in intercalated layered superconductors, particularly those exhibiting significant interlayer misalignments.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(Li,Fe)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	41.8	Pressure not reported	midpoint
(Li,Fe)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43.2	Pressure not reported	midpoint
(CTA)0.5SnSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
(V2Sr4O6)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ba6Nb11S28 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
KCa2Fe4As4F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown