<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Pb</mml:mi><mml:mn>9</mml:mn></mml:msub><mml:mi>Cu</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>PO</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>6</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>OH</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: Phonon bands, localized flat-band magnetism, models, and chemical analysis
Yi Jiang, S. Lee, Jonah Herzog-Arbeitman, Jiabin Yu, Xiaolong Feng, Haoyu Hu, Dumitru Călugăru, Parker S. Brodale, Eoghan L. Gormley, Maia G. Vergniory, Claudia Felser, S. Blanco-Canosa, Christopher H. Hendon, Leslie M. Schoop, B. Andrei Bernevig
Abstract
Doped lead apatite (LK-99) has been proposed as a candidate ambient temperature and pressure superconductor, a dramatic claim requiring careful investigation from experiment and theory. Here, the authors synthesize an LK-99 sample and find a multiphase, transparent material that does not support high-temperature superconductivity. This is in agreement with $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculations here that suggest the copper dopant does not meaningfully enter the structure and that the flat bands they generate at the Fermi level are largely unhybridized, with no quantum geometry to support a superfluid state.