{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T19:53:56Z","timestamp":1792785236092,"version":"4.5.0"},"reference-count":49,"publisher":"National Academy of Sciences","issue":"38","license":[{"start":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T00:00:00Z","timestamp":1789430400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100006151","name":"DOE | SC | Basic Energy Sciences","doi-asserted-by":"publisher","award":["DE-AC02-06CH11357"],"award-info":[{"award-number":["DE-AC02-06CH11357"]}],"id":[{"id":"10.13039\/100006151","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006151","name":"DOE | SC | Basic Energy Sciences","doi-asserted-by":"publisher","award":["DE-SC0014520"],"award-info":[{"award-number":["DE-SC0014520"]}],"id":[{"id":"10.13039\/100006151","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000078","name":"NSF | MPS | Division of Materials Research","doi-asserted-by":"publisher","award":["DMR-160112"],"award-info":[{"award-number":["DMR-160112"]}],"id":[{"id":"10.13039\/100000078","id-type":"DOI","asserted-by":"publisher"},{"id":"https:\/\/ror.org\/01pc7k308","id-type":"ROR","asserted-by":"crossref"}]},{"DOI":"10.13039\/100007059","name":"Northwestern University","doi-asserted-by":"publisher","award":["n\/a"],"award-info":[{"award-number":["n\/a"]}],"id":[{"id":"10.13039\/100007059","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[2026,9,22]]},"abstract":"<jats:p>\n                    The relationship between local coordination, framework connectivity, and lattice scattering, electronic structure, and quantum transport in complex pnictides remains poorly understood. Here, we show that Cu\u2013As polyhedral architecture provides a structural route to tuning scattering and quantum magnetotransport in Ba\u2013Cu\u2013As pnictide single crystals. The clearest example is BaCu\n                    <jats:sub>4<\/jats:sub>\n                    As\n                    <jats:sub>2<\/jats:sub>\n                    , which undergoes a first-order transition near 225 K from a trigonal to a triclinic structure. This symmetry lowering converts the Cu\u2013As framework into a more distorted mixed-coordination network and is accompanied by a sharp resistive anomaly, thermal hysteresis, heat-capacity feature, Hall-response changes, and reconstruction of the low-temperature electronic structure. High-field measurements further reveal light carriers associated with small three-dimensional Fermi pockets in the reconstructed phase. A broader comparison with Ba\n                    <jats:sub>2<\/jats:sub>\n                    Cu\n                    <jats:sub>18\u2212x<\/jats:sub>\n                    As\n                    <jats:sub>10<\/jats:sub>\n                    , BaCu\n                    <jats:sub>8<\/jats:sub>\n                    As\n                    <jats:sub>4<\/jats:sub>\n                    , BaCu\n                    <jats:sub>6<\/jats:sub>\n                    As\n                    <jats:sub>2<\/jats:sub>\n                    , and BaCu\n                    <jats:sub>2<\/jats:sub>\n                    As\n                    <jats:sub>2<\/jats:sub>\n                    shows that the characteristic electron\u2013phonon scattering scale extracted from Bloch\u2013Gr\u00fcneisen fits follows the dimensionality and connectivity of the Cu\u2013As polyhedral networks. BaCu\n                    <jats:sub>8<\/jats:sub>\n                    As\n                    <jats:sub>4<\/jats:sub>\n                    , a three-dimensional mixed-coordination framework, additionally exhibits low-field magnetoconductance consistent with weak-antilocalization-like behavior and symmetry-indicator evidence suggestive of nontrivial topology. These results underscore the Ba\u2013Cu\u2013As family as a platform in which Cu coordination, framework dimensionality, and metal or pnictogen bonding provide chemical handles for controlling metallic scattering, Fermi-surface reconstruction, and quantum magnetotransport.\n                  <\/jats:p>","DOI":"10.1073\/pnas.2620060123","type":"journal-article","created":{"date-parts":[[2026,9,15]],"date-time":"2026-09-15T17:55:17Z","timestamp":1789494917000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":0,"title":["Structure-controlled quantum magnetotransport in Ba\u2013Cu\u2013As pnictide single crystals"],"prefix":"10.1073","volume":"123","author":[{"given":"Souvik","family":"Sasmal","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05gvnxz63","id-type":"ROR","asserted-by":"publisher"}],"name":"Materials Science Division, Argonne National 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