Absence of gross inhomogeneity in HTS cuprates
Abstract
Recent scanning tunnelling microscopy (STM) studies on Bi2Sr2CaCu2O8+δ (Bi-2212) revealed the presence of severe inhomogeneity with length scale L0 ≈ 0, the coherence length. Other studies have been interpreted in terms of mesoscale or nanoscale phase segregation. Here we analyze heat capacity and NMR data on Bi-2212 and (Y,Ca)Ba2Cu3O7-δ and find no evidence for phase segregation or gross inhomogeneity. For Bi-2212 the coherence scale L0 increases with doping from 5 to 170 and the hole density inhomogeneity decreases from 0.028 to 0.005 holes/Cu. We conclude that STM measurements considerably overstate the inhomogeneity in bulk Bi-2212.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.