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They serve as archetypal model systems for condensed matter physics and constitute fundamental building blocks for next-generation nanoelectronics. However, synthesis of SMACs suitable for practical applications remains challenging. In this work, we create micrometer-long, carbon-sheathed copper SMACs at milligram scale by compressing \u03b2-copper phthalocyanine to above 21 gigapascals. The SMACs are in atom-scale ordering, are isolable through acid-assisted exfoliation, and exhibit exceptional stability, with Cu-Cu distance confined at 2.57 angstroms. Anisotropic conductance and antiferromagnetic interactions are suggested by experimental and computational results. This work establishes a universal synthetic strategy for sheathed SMACs, positioning them as a compelling platform for prospective electronic and spintronic applications.<\/jats:p>","DOI":"10.1126\/science.aeg0028","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T18:00:41Z","timestamp":1787248841000},"page":"826-830","update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":2,"title":["Ultralong sheathed single-metal-atom chains synthesized under high pressure"],"prefix":"10.1126","volume":"393","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-3148-3177","authenticated-orcid":true,"given":"Jie","family":"Zhang","sequence":"first","affiliation":[{"name":"Center for High Pressure Science and Technology Advanced Research, Beijing, P.R. 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