{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T05:28:20Z","timestamp":1790141300342,"version":"4.0.1"},"reference-count":42,"publisher":"American Physical Society (APS)","issue":"6","license":[{"start":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T00:00:00Z","timestamp":1708041600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","award":["DE-SC-0018660"],"award-info":[{"award-number":["DE-SC-0018660"]}],"id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006151","name":"Basic Energy Sciences","doi-asserted-by":"publisher","award":["DE-SC-0018660"],"award-info":[{"award-number":["DE-SC-0018660"]}],"id":[{"id":"10.13039\/100006151","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000700","name":"Royal Commission for the Exhibition of 1851","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000700","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100006228","name":"Oak Ridge National Laboratory","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100006228","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["ECCS-2025462"],"award-info":[{"award-number":["ECCS-2025462"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.aps.org"],"crossmark-restriction":true},"short-container-title":["Phys. Rev. B"],"accepted":{"date-parts":[[2024,1,5]]},"abstract":"<jats:p><a:math xmlns:a=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><a:mrow><a:msub><a:mi>MgCr<\/a:mi><a:mn>2<\/a:mn><\/a:msub><a:msub><a:mi mathvariant=\"normal\">O<\/a:mi><a:mn>4<\/a:mn><\/a:msub><\/a:mrow><\/a:math> is one of the best-known realizations of the pyrochlore-lattice Heisenberg antiferromagnet. The strong antiferromagnetic exchange interactions are perturbed by small further-neighbor exchanges such that this compound may in principle realize a spiral spin liquid (SSL) phase in the zero-temperature limit. However, a spin Jahn-Teller transition below <c:math xmlns:c=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><c:mrow><c:msub><c:mi>T<\/c:mi><c:mi mathvariant=\"normal\">N<\/c:mi><\/c:msub><c:mo>\u2248<\/c:mo><c:mn>13<\/c:mn><\/c:mrow><\/c:math>\u00a0K yields a complicated long-range magnetic order with multiple coexisting propagation vectors. We present neutron scattering and thermomagnetic measurements of <e:math xmlns:e=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><e:mrow><e:msub><e:mi>MgCr<\/e:mi><e:mn>2<\/e:mn><\/e:msub><e:msub><e:mi mathvariant=\"normal\">O<\/e:mi><e:mn>4<\/e:mn><\/e:msub><\/e:mrow><\/e:math> samples under applied hydrostatic pressure up to <g:math xmlns:g=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><g:mrow><g:mi>P<\/g:mi><g:mo>=<\/g:mo><g:mn>1.7<\/g:mn><\/g:mrow><\/g:math>\u00a0GPa demonstrating the existence of multiple close-lying nearly degenerate magnetic ground states. We show that the application of hydrostatic pressure increases the ordering temperature by around 0.8\u00a0K per GPa and increases the bandwidth of the magnetic excitations by around 0.5\u00a0meV per GPa. We also evidence a strong tendency for the preferential occupation of a subset of magnetic domains under pressure. In particular, we show that the <h:math xmlns:h=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><h:mrow><h:mi mathvariant=\"bold-italic\">k<\/h:mi><h:mo>=<\/h:mo><h:mo>(<\/h:mo><h:mn>0<\/h:mn><h:mo>,<\/h:mo><h:mn>0<\/h:mn><h:mo>,<\/h:mo><h:mn>1<\/h:mn><h:mo>)<\/h:mo><\/h:mrow><\/h:math> magnetic phase, which is almost negligible at ambient pressure, dramatically increases in spectral weight under pressure. This modifies the spectrum of magnetic excitations, which we interpret unambiguously as spin waves from multiple magnetic domains. Moreover, we report that the application of pressure reveals a feature in the magnetic susceptibility above the magnetostructural transition. We interpret this as the onset of a short-range ordered phase associated with <j:math xmlns:j=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><j:mrow><j:mi mathvariant=\"bold-italic\">k<\/j:mi><j:mo>=<\/j:mo><j:mo>(<\/j:mo><j:mn>0<\/j:mn><j:mo>,<\/j:mo><j:mn>0<\/j:mn><j:mo>,<\/j:mo><j:mn>1<\/j:mn><j:mo>)<\/j:mo><\/j:mrow><\/j:math>, previously not observed in magnetometry measurements.<\/jats:p>\n          <jats:sec>\n            <jats:title\/>\n            <jats:supplementary-material>\n              <jats:permissions>\n                <jats:copyright-statement>Published by the American Physical Society<\/jats:copyright-statement>\n                <jats:copyright-year>2024<\/jats:copyright-year>\n              <\/jats:permissions>\n            <\/jats:supplementary-material>\n          <\/jats:sec>","DOI":"10.1103\/physrevb.109.064415","type":"journal-article","created":{"date-parts":[[2024,2,16]],"date-time":"2024-02-16T16:25:02Z","timestamp":1708100702000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["Pressure control of magnetic order and excitations in the pyrochlore antiferromagnet \n<mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mml:mrow><mml:msub><mml:mi>MgCr<\/mml:mi><mml:mn>2<\/mml:mn><\/mml:msub><mml:msub><mml:mi mathvariant=\"normal\">O<\/mml:mi><mml:mn>4<\/mml:mn><\/mml:msub><\/mml:mrow><\/mml:math>"],"prefix":"10.1103","volume":"109","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7517-2865","authenticated-orcid":true,"given":"L. S.","family":"Nassar","sequence":"first","affiliation":[{"name":"School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.","family":"Lane","sequence":"additional","affiliation":[{"name":"School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA"},{"name":"School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7391-6031","authenticated-orcid":true,"given":"B.","family":"Haberl","sequence":"additional","affiliation":[{"name":"Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, Tennessee 37831, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Graves-Brook","sequence":"additional","affiliation":[{"name":"Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, Tennessee 37831, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B.","family":"Winn","sequence":"additional","affiliation":[{"name":"Neutron Scattering Division, Oak Ridge National Lab, Oak Ridge, Tennessee 37831, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. M.","family":"Koohpayeh","sequence":"additional","affiliation":[{"name":"Institute for Quantum Matter and Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA"},{"name":"Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, USA"},{"name":"Ralph O'Connor Sustainable Energy Institute, The Johns Hopkins University, Baltimore, Maryland 21218, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2772-8440","authenticated-orcid":true,"given":"M.","family":"Mourigal","sequence":"additional","affiliation":[{"name":"School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"16","published-online":{"date-parts":[[2024,2,16]]},"reference":[{"key":"PhysRevB.109.064415Cc1R1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRev.102.1008"},{"key":"PhysRevB.109.064415Cc2R1","doi-asserted-by":"crossref","DOI":"10.1007\/978-3-642-10589-0","volume-title":"Introduction to Frustrated Magnetism","author":"C. 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