{"paper":{"title":"Heterometallic spin-1/2 quantum magnet under hydrostatic pressure","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Hydrostatic pressure on a copper-vanadium spin dimer confirms an unusual oxygen-mediated exchange path.","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"A. Chmeruk, B.M. Huddart, D. Graf, D. Kamenskyi, H. Nojiri, H. Ohta, J.L. Manson, J.P. Tidey, M.J. Coak, P.A. Goddard, S.J. Clark, S. Kimura, S. Okubo, S.P.M. Curley, T. Lancaster, T. Sakurai, Z.E. Manson","submitted_at":"2025-12-01T18:52:41Z","abstract_excerpt":"We investigate the properties of CuVOF$_4$(H$_2$O)$_6$$\\cdot$H$_2$O, in which two different spin species, Cu(II) and V(IV), form antiferromagnetic spin-1/2 dimers with weak interdimer coupling provided via hydrogen bonding. Using radio-frequency susceptometry and electron-spin resonance (ESR), we show how the temperature-magnetic field spin-dimer phase diagram evolves as a function of applied hydrostatic pressure and correlate this with pressure-induced changes to the crystal structure. These results, coupled with pressure-tuned DFT calculations, confirm the prior prediction that the primary e"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"These results, coupled with pressure-tuned DFT calculations, confirm the prior prediction that the primary exchange interaction is mediated via an unusual mechanism in which the V(IV) ions provide considerable spin density to the oxygen that joins the two spins in each dimer and which lies along the Jahn-Teller axis of the Cu(II) ion.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the DFT calculations correctly capture the pressure-induced structural distortions and resulting spin-density distribution without significant functional or parameter choices that could alter the identified mediation path.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Pressure-dependent experiments on a heterometallic Cu-V spin-1/2 dimer magnet confirm an unusual exchange mechanism mediated by vanadium spin density on the linking oxygen along the Cu Jahn-Teller axis.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Hydrostatic pressure on a copper-vanadium spin dimer confirms an unusual oxygen-mediated exchange path.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"19bf4e01fbc492ed991f41b1f64d70965ec8bb36552b66a3be1c19c71daa3253"},"source":{"id":"2512.01994","kind":"arxiv","version":2},"verdict":{"id":"7b255aaf-f415-4d34-bd1a-01336ffaac9b","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-17T02:26:04.720680Z","strongest_claim":"These results, coupled with pressure-tuned DFT calculations, confirm the prior prediction that the primary exchange interaction is mediated via an unusual mechanism in which the V(IV) ions provide considerable spin density to the oxygen that joins the two spins in each dimer and which lies along the Jahn-Teller axis of the Cu(II) ion.","one_line_summary":"Pressure-dependent experiments on a heterometallic Cu-V spin-1/2 dimer magnet confirm an unusual exchange mechanism mediated by vanadium spin density on the linking oxygen along the Cu Jahn-Teller axis.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the DFT calculations correctly capture the pressure-induced structural distortions and resulting spin-density distribution without significant functional or parameter choices that could alter the identified mediation path.","pith_extraction_headline":"Hydrostatic pressure on a copper-vanadium spin dimer confirms an unusual oxygen-mediated exchange path."},"references":{"count":39,"sample":[{"doi":"","year":2023,"title":"D. C. Krakauer, Interface Focus13, 20220075 (2023)","work_id":"73b2b088-f7e7-45e5-9d00-c283909f2400","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2012,"title":"L. Canetti, M. Drewes, and M. Shaposhnikov, New Jour- nal of Physics14, 095012 (2012)","work_id":"3b8ce95d-5a74-4f44-b4ec-b16a0522bdde","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1964,"title":"P. W. Higgs, Phys. Rev. Lett.13, 508 (1964)","work_id":"c924dd09-6ea5-4477-8192-dabd2e32f96c","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2005,"title":"Sandars, International Journal of Astrobiology4, 49–61 (2005)","work_id":"25fd79d2-482d-4833-96e1-4e7c2992cd02","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1997,"title":"P. W. Anderson,Basic Notions of Condensed matter Physics, 2nd ed. (Westview Press, 1997)","work_id":"70fa6c18-c698-4454-91c2-be25b713d53c","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":39,"snapshot_sha256":"ebf7d276dc41f0ca48c7ea15434e4f8d1a96c551e4c298607f61b47aa368b30c","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"}