Zero-Field Diode Effect as a Constraint on Cuprate Superconductivity Mechanisms

Authors

• Armen Gulian, Chapman UniversityFollow
• Serafim Teknowijoyo, Chapman University
• Vahan Nikoghosyan, Chapman University

Document Type

Article

Publication Date

8-26-2026

Abstract

We present measurements demonstrating that copper-oxide high-temperature superconductors can exhibit broken time-reversal symmetry in the absence of external magnetic fields. Using Tl₂⁢Ba₂⁢CaCu₂⁢O₈ microbridges, we observe a pronounced superconducting diode effect at 100 K under strictly zero-field conditions. This nonreciprocal response remains unchanged in magnetic fields up to ±100 Oe. Our results are consistent with recent reports of zero-field diode behavior in Bi₂⁢Sr₂⁢CaCu₂⁢O_8+𝛿 and together they indicate that time-reversal symmetry breaking may be an intrinsic property of the cuprate superconducting state. These findings provide an additional experimental constraint on theoretical descriptions of high-temperature superconductivity and motivate further investigations of possible time-reversal-symmetry-breaking phenomena in cuprates.

Comments

This article was originally published in Physical Review B, volume 114, in 2026. https://doi.org/10.1103/gphc-9lhn

Recommended Citation

A. Gulian, S. Teknowijoyo, and V. Nikoghosyan, Zero-field diode effect as a constraint on cuprate superconductivity mechanisms , Phys. Rev. B 114, 094517 (2026). https://doi.org/10.1103/gphc-9lhn

Peer Reviewed

1

Copyright

American Physical Society