{"paper":{"title":"Indirect and direct energy gaps in the Kondo semiconductor YbB12","license":"","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"F. Iga, H. Okamura, S. Kimura, T. Michizawa, T. Nanba, T. Takabatake","submitted_at":"2005-03-31T08:19:24Z","abstract_excerpt":"Optical conductivity [$\\sigma(\\omega)$] of the Kondo semiconductor YbB$_{12}$ has been measured over wide ranges of temperature ($T$=8$-$690 K) and photon energy ($\\hbar \\omega \\geq$ 1.3 meV). The $\\sigma(\\omega)$ data reveal the entire crossover of YbB$_{12}$ from a metallic electronic structure at high $T$ into a semiconducting one at low $T$. Associated with the gap development in $\\sigma(\\omega)$, a clear onset is newly found at $\\hbar\\omega$=15 meV for $T \\leq$ 20 K. The onset energy is identified as the gap width of YbB$_{12}$ appearing in $\\sigma(\\omega)$. This gap in \\sigma(\\omega)$ is"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"cond-mat/0503738","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/cond-mat/0503738/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"}