Surface pinning and grain boundary formation in magnetic flux-line lattices of Bi2Sr2CaCu2O8+δ high-Tc superconductors

Hongjie Dai; Jie Liu; Charles M. Lieber

doi:10.1103/PhysRevLett.72.748

← Back to search

Surface pinning and grain boundary formation in magnetic flux-line lattices of Bi2Sr2CaCu2O8+δ high-Tc superconductors

Hongjie Dai, Jie Liu, Charles M. Lieber

DOI 10.1103/PhysRevLett.72.748 · Physical Review Letters

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

Magnetic decoration has been used to investigate the role of surface pinning on the flux-line lattice (FLL) of high-quality Bi2Sr2CaCu2O8+δ single crystals. We find that surface steps pin flux lines at the sample surface, and that strong pinning along large steps creates grain boundaries (GBs) in the FLL. Analysis of the competing energetics of pinning versus GB formation leads to a criteria for the formation of extended GBs, and also indicates that these GBs penetrate through the entire sample. Surface pinning, which should occur in all real samples, will thus significantly affect the bulk FLL structure in these materials.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown