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Article: Experimental Identification of Electric Dipoles Induced by Magnetic Monopoles in Tb2Ti2O7

TitleExperimental Identification of Electric Dipoles Induced by Magnetic Monopoles in Tb2Ti2O7
Authors
Issue Date2020
PublisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/
Citation
Physical Review Letters, 2020, v. 124 n. 8, article no. 087601 How to Cite?
AbstractThe fundamental principles of electrodynamics allow an electron carrying both electric monopole (charge) and magnetic dipole (spin) but prohibit its magnetic counterpart. Recently, it was predicted that the magnetic 'monopoles' carrying emergent magnetic charges in spin ice systems can induce electric dipoles. The inspiring prediction offers a novel way to study magnetic monopole excitations and magnetoelectric coupling. However, no clear example has been identified up to now. Here, we report the experimental evidence for electric dipoles induced by magnetic monopoles in spin frustrated Tb2Ti2O7. The magnetic field applied to pyrochlore Tb2Ti2O7 along the [111] direction, brings out a '3-in-1-out' magnetic monopole configuration, and then induces a subtle structural phase transition at Hc∼2.3 T. The transition is made evident by the nonlinear phonon splitting under magnetic fields and the anomalous crystal-field excitations of Tb3+ ions. The observations consistently point to the displacement of the oxygen O′′ anions along the [111] axis which gives rise to the formation of electric dipoles. The finding demonstrates that the scenario of magnetic monopole having both magnetic charge and electric dipole is realized in Tb2Ti2O7 and sheds light into the coupling between electricity and magnetism of magnetic monopoles in spin frustrated systems.
Persistent Identifierhttp://hdl.handle.net/10722/286299
ISSN
2019 Impact Factor: 8.385
2015 SCImago Journal Rankings: 3.731
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorJin, F-
dc.contributor.authorLiu, C-
dc.contributor.authorChang, Y-
dc.contributor.authorZhang, A-
dc.contributor.authorWang, Y-
dc.contributor.authorLiu, W-
dc.contributor.authorWang, X-
dc.contributor.authorSun, Y-
dc.contributor.authorChen, G-
dc.contributor.authorSun, X-
dc.contributor.authorZhang, Q-
dc.date.accessioned2020-08-31T07:01:57Z-
dc.date.available2020-08-31T07:01:57Z-
dc.date.issued2020-
dc.identifier.citationPhysical Review Letters, 2020, v. 124 n. 8, article no. 087601-
dc.identifier.issn0031-9007-
dc.identifier.urihttp://hdl.handle.net/10722/286299-
dc.description.abstractThe fundamental principles of electrodynamics allow an electron carrying both electric monopole (charge) and magnetic dipole (spin) but prohibit its magnetic counterpart. Recently, it was predicted that the magnetic 'monopoles' carrying emergent magnetic charges in spin ice systems can induce electric dipoles. The inspiring prediction offers a novel way to study magnetic monopole excitations and magnetoelectric coupling. However, no clear example has been identified up to now. Here, we report the experimental evidence for electric dipoles induced by magnetic monopoles in spin frustrated Tb2Ti2O7. The magnetic field applied to pyrochlore Tb2Ti2O7 along the [111] direction, brings out a '3-in-1-out' magnetic monopole configuration, and then induces a subtle structural phase transition at Hc∼2.3 T. The transition is made evident by the nonlinear phonon splitting under magnetic fields and the anomalous crystal-field excitations of Tb3+ ions. The observations consistently point to the displacement of the oxygen O′′ anions along the [111] axis which gives rise to the formation of electric dipoles. The finding demonstrates that the scenario of magnetic monopole having both magnetic charge and electric dipole is realized in Tb2Ti2O7 and sheds light into the coupling between electricity and magnetism of magnetic monopoles in spin frustrated systems.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at https://journals.aps.org/prl/-
dc.relation.ispartofPhysical Review Letters-
dc.rightsCopyright 2020 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevLett.124.087601.-
dc.titleExperimental Identification of Electric Dipoles Induced by Magnetic Monopoles in Tb2Ti2O7-
dc.typeArticle-
dc.identifier.emailChen, G: gangchen@hku.hk-
dc.identifier.authorityChen, G=rp02491-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevLett.124.087601-
dc.identifier.pmid32167317-
dc.identifier.scopuseid_2-s2.0-85081790536-
dc.identifier.hkuros313346-
dc.identifier.volume124-
dc.identifier.issue8-
dc.identifier.spagearticle no. 087601-
dc.identifier.epagearticle no. 087601-
dc.identifier.isiWOS:000517293400015-
dc.publisher.placeUnited States-

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