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For Cu$_4$Cu, our data imply axial-type $g$-anisotropy with $g_{x}$ = 2.03 $\\pm$ 0.01, $g_{y}$ = 2.04 $\\pm$ 0.01, and $g_{z}$ = 2.23 $\\pm$ 0.01, yielding $g=2.10 \\pm 0.02$. No significant zero field splitting (ZFS) of the ground state mode is observed. In Co$_4$Co, we find a m$_S$ = $\\pm$3/2 ground state with $g=2.66$. The data suggest large anisotropy $D$ of negative sign."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1903.04031","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2019-03-10T18:20:59Z","cross_cats_sorted":["cond-mat.mtrl-sci"],"title_canon_sha256":"6eb4acba4f27fba6ab5b9450898985fb61e20e1c001cd12c00212a31c0c6a5f1","abstract_canon_sha256":"5125f417b4b632ddd8ec7fdd7399f43d5f41bc8a550ef86e0bdb2937295fa666"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:55.053594Z","signature_b64":"GebmIP+bmaucPJjPw7yGhELTC9nDBZHPJ6/3VkZcPQciwl6HcC6V4Y+JCdMoAnZylgnAmLNgeZMNZAiKSyspCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0ee550f0efb99cf218913b4e30faf91098cfbc3fec41abd75eff3cb81eecaee8","last_reissued_at":"2026-05-17T23:50:55.052980Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:55.052980Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"High-frequency EPR study on Cu$_4$Cu- and Co$_4$Co-metallacrown complexes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci"],"primary_cat":"cond-mat.mes-hall","authors_text":"C. Koo, E. Rentschler, J. Butscher, J. Park, R. Klingeler","submitted_at":"2019-03-10T18:20:59Z","abstract_excerpt":"High-frequency/high-field electron paramagnetic resonance studies on two homo-nuclear 12-MC-4 metallacrown complexes Cu$_4$Cu and Co$_4$Co are presented. For Cu$_4$Cu, our data imply axial-type $g$-anisotropy with $g_{x}$ = 2.03 $\\pm$ 0.01, $g_{y}$ = 2.04 $\\pm$ 0.01, and $g_{z}$ = 2.23 $\\pm$ 0.01, yielding $g=2.10 \\pm 0.02$. No significant zero field splitting (ZFS) of the ground state mode is observed. In Co$_4$Co, we find a m$_S$ = $\\pm$3/2 ground state with $g=2.66$. 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