Work

Intrinsic Local Structure Anisotropy of Bi 2 Sr 2 CaCu 2 O 8+δ Superconductor Probed by Polarized X‐Ray Absorption Spectroscopy

Year: 2026

Type: article

Abstract: ABSTRACT We have investigated the local structure of superconductor by Cu K‐edge extended x‐ray absorption fine structure (EXAFS) spectroscopy to explore the temperature‐dependent local displacements and their possible relationship with the charge ordering, nematicity, and superconductivity. We have used x‐ray polarization dependence of the EXAFS signal to unravel a clear local structure anisotropy, indicating a deviation from the average tetragonal symmetry. This distortion is associated with charge ordering and stripe formation in the plane. Anomalies in the Debye–Waller factor at both the charge‐ordering and superconducting transition temperatures suggest a strong coupling between the local displacements and electronic degrees of freedom. The local structure anisotropy appears stronger in the interlayer, highlighted by the Cu─Sr bond correlations. These findings provide further insight into the interplay between atomic displacements, charge ordering, and superconductivity in , emphasizing the importance of local structural effects in shaping the electronic phase diagram of high‐ cuprates.

Source: Chemistry - A European Journal

DOI: 10.1002/chem.71578

Authors: G. Tomassucci, F. Minati, F. Vergari, L. Simonelli, T. Mizokawa, N. L. Saini

Institutions: Sapienza University of Rome, ALBA Synchrotron (Spain), Waseda University

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: European Commission, Sapienza Università di Roma

Awards: G4807752964, G5035860685