{"paper":{"title":"X-ray absorption and optical spectroscopy studies of (Mg$_{1-x}$Al$_x$)B$_2$","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"C. U. Jung, H. D. Yang, H. L. Liu, J. M. Chen, J.-Y. Lin, Min-Seok Park, M. X. Kuo, P. L. Ho, Sung-Ik Lee","submitted_at":"2003-08-05T11:43:34Z","abstract_excerpt":"X-ray absorption spectroscopy and optical reflectance measurements have been carried out to elucidate the evolution of the electronic structure in (Mg$_{1-x}$Al$_{x}$)B$_{2}$ for $\\emph{x}$ = 0.0,0.1, 0.2, 0.3, and 0.4. The important role of B 2$\\emph{p}$ $\\sigma$ hole states to superconductivity has been identified, and the decrease in the hole carrier number is $\\emph{quantitatively}$ determined. The rate of the decrease in the hole concentration agree well with the theoretical calculations. On the other hand,while the evolution of the electronic structure is gradual through the doping range"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0308081","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}