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Rev. Lett."],"accepted":{"date-parts":[[2026,8,20]]},"abstract":"<jats:p>\n                    In the heavy-fermion metal\n                    <a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <a:mrow>\n                        <a:mrow>\n                          <a:msub>\n                            <a:mrow>\n                              <a:mi>YbRh<\/a:mi>\n                            <\/a:mrow>\n                            <a:mrow>\n                              <a:mn>2<\/a:mn>\n                            <\/a:mrow>\n                          <\/a:msub>\n                        <\/a:mrow>\n                        <a:mrow>\n                          <a:msub>\n                            <a:mrow>\n                              <a:mi>Si<\/a:mi>\n                            <\/a:mrow>\n                            <a:mrow>\n                              <a:mn>2<\/a:mn>\n                            <\/a:mrow>\n                          <\/a:msub>\n                        <\/a:mrow>\n                      <\/a:mrow>\n                    <\/a:math>\n                    , quantum criticality at a suppressed antiferromagnetic order is governed by the interplay of local magnetic moments and itinerant conduction electrons. We demonstrate how this can be investigated by a new experimental approach that enables the observation of electron spin resonance (ESR) across a broad range of frequencies and fields at very low temperatures. This allowed us to cover a large part of the phase diagram from the paramagnetic Fermi-liquid phase to the phase with antiferromagnetic order and including the quantum-critical regime. Both the ESR\n                    <c:math xmlns:c=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <c:mi>g<\/c:mi>\n                    <\/c:math>\n                    factor and the linewidth present distinct behaviors in these three regimes, providing further insight into the physics across a quantum critical point. Notably, when cooling down at a field directly toward the quantum critical point, both\n                    <e:math xmlns:e=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <e:mi>g<\/e:mi>\n                    <\/e:math>\n                    factor and linewidth continuously decrease. Furthermore, we observe a very good matching of the\n                    <g:math xmlns:g=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"inline\">\n                      <g:mi>g<\/g:mi>\n                    <\/g:math>\n                    -factor behavior upon field tuning and temperature tuning toward the quantum-critical point. We analyze and discuss the results in the context of present theories on ESR in strongly correlated electron systems.\n                  <\/jats:p>","DOI":"10.1103\/y227-dk8f","type":"journal-article","created":{"date-parts":[[2026,8,20]],"date-time":"2026-08-20T15:14:29Z","timestamp":1787238869000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Evolution of Electron Spin Resonance through a Metallic Quantum Critical Phase Diagram"],"prefix":"10.1103","volume":"137","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7044-7532","authenticated-orcid":true,"given":"Marc","family":"Scheffler","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/04vnq7t77","id-type":"ROR","asserted-by":"publisher"}],"name":"Universit\u00e4t 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Moreover, a linear relation between g and magnetic susceptibility has been identified [49] which clearly is not the case for temperatures near or below T*.","type":"other"},{"key":"y227-dk8fCc67R1","doi-asserted-by":"publisher","DOI":"10.1088\/0953-8984\/20\/45\/455208","type":"journal-article"},{"key":"y227-dk8fCc68R1","doi-asserted-by":"publisher","DOI":"10.1063\/1.4921231","type":"journal-article"},{"key":"y227-dk8fCc69R1","doi-asserted-by":"publisher","DOI":"10.1038\/s41567-024-02679-7","type":"journal-article"},{"key":"y227-dk8fCc70R1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.89.107202","type":"journal-article"},{"key":"y227-dk8fCc71R1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.107.026402","type":"journal-article"},{"key":"y227-dk8fCc72R1","doi-asserted-by":"publisher","DOI":"10.1038\/nature09910","type":"journal-article"}],"container-title":["Physical Review Letters"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/link.aps.org\/article\/10.1103\/y227-dk8f","content-type":"unspecified","content-version":"vor","intended-application":"syndication"},{"URL":"http:\/\/harvest.aps.org\/v2\/journals\/articles\/10.1103\/y227-dk8f\/fulltext","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T18:33:51Z","timestamp":1790879631000},"score":1,"resource":{"primary":{"URL":"https:\/\/link.aps.org\/doi\/10.1103\/y227-dk8f"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,25]]},"references-count":72,"journal-issue":{"issue":"13","published-print":{"date-parts":[[2026,9]]}},"URL":"https:\/\/doi.org\/10.1103\/y227-dk8f","relation":{"has-preprint":[{"id-type":"doi","id":"10.48550\/arXiv.2609.03994","asserted-by":"subject"}]},"ISSN":["0031-9007","1079-7114"],"issn-type":[{"value":"0031-9007","type":"print"},{"value":"1079-7114","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,25]]},"assertion":[{"value":"2026-03-06","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"Published by the American Physical Society. All rights are reserved, including those for text and data mining, AI training, and similar technologies.","name":"copyright_statement","label":"Copyright statement","group":{"name":"copyright","label":"copyright"}},{"value":"2026","name":"copyright_year","label":"Copyright year","group":{"name":"copyright","label":"copyright"}},{"value":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/","name":"creative_commons_license","label":"Creative Commons license","group":{"name":"licenses","label":"Licenses"}},{"value":"\u00a92026 The authors","name":"copyright_holder","label":"Copyright holder","group":{"name":"copyright","label":"copyright"}}],"article-number":"136506"}}