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Article: Upper branch magnetism in quantum magnets: Collapses of excited levels and emergent selection rules

TitleUpper branch magnetism in quantum magnets: Collapses of excited levels and emergent selection rules
Authors
Issue Date2019
PublisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/
Citation
Physical Review B: covering condensed matter and materials physics, 2019, v. 99 n. 22, article no. 224407, p. 1-9 How to Cite?
AbstractIn many quantum magnets, especially the rare-earth ones, the low-lying crystal-field states are not well separated from the excited ones and thus they are insufficient to describe the low-temperature magnetic properties. Inspired by this simple observation, we develop a microscopic theory to describe the magnetic physics due to the collapses of the weak crystal-field states. We find two cases in which the excited crystal-field states should be seriously included in the theory. One case is when the bandwidth of the excited crystal-field states is comparable to the crystal-field gap. The other case is when the exchange-energy gain between the low-lying and the excited crystal-field states overcomes the crystal-field gap. Both cases could drive a phase transition and result in magnetic orders by involving the excited crystal-field states. We dub the above physics 'upper branch magnetism and phase transition.' We discuss the multitude of magnetic phases and the emergent selection rules for the detection of the underlying excitations. We expect that our results will help improve the understanding of many rare-earth magnets with weak crystal-field gaps such as Tb2Ti2O7 and Tb2Sn2O7, and will also provide a complementary perspective to the prevailing local 'J' physics in 4d/5d magnets.
Persistent Identifierhttp://hdl.handle.net/10722/272295
ISSN
2017 Impact Factor: 3.813
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLiu, C-
dc.contributor.authorLi, F-
dc.contributor.authorChen, G-
dc.date.accessioned2019-07-20T10:39:28Z-
dc.date.available2019-07-20T10:39:28Z-
dc.date.issued2019-
dc.identifier.citationPhysical Review B: covering condensed matter and materials physics, 2019, v. 99 n. 22, article no. 224407, p. 1-9-
dc.identifier.issn2469-9950-
dc.identifier.urihttp://hdl.handle.net/10722/272295-
dc.description.abstractIn many quantum magnets, especially the rare-earth ones, the low-lying crystal-field states are not well separated from the excited ones and thus they are insufficient to describe the low-temperature magnetic properties. Inspired by this simple observation, we develop a microscopic theory to describe the magnetic physics due to the collapses of the weak crystal-field states. We find two cases in which the excited crystal-field states should be seriously included in the theory. One case is when the bandwidth of the excited crystal-field states is comparable to the crystal-field gap. The other case is when the exchange-energy gain between the low-lying and the excited crystal-field states overcomes the crystal-field gap. Both cases could drive a phase transition and result in magnetic orders by involving the excited crystal-field states. We dub the above physics 'upper branch magnetism and phase transition.' We discuss the multitude of magnetic phases and the emergent selection rules for the detection of the underlying excitations. We expect that our results will help improve the understanding of many rare-earth magnets with weak crystal-field gaps such as Tb2Ti2O7 and Tb2Sn2O7, and will also provide a complementary perspective to the prevailing local 'J' physics in 4d/5d magnets.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/-
dc.relation.ispartofPhysical Review B: covering condensed matter and materials physics-
dc.rightsCopyright 2019 by The American Physical Society. This article is available online at https://doi.org/10.1103/PhysRevB.99.224407.-
dc.titleUpper branch magnetism in quantum magnets: Collapses of excited levels and emergent selection rules-
dc.typeArticle-
dc.identifier.emailLiu, C: cliuphy@hku.hk-
dc.identifier.emailLi, F: lifeiye@hku.hk-
dc.identifier.emailChen, G: gangchen@hku.hk-
dc.identifier.authorityChen, G=rp02491-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.99.224407-
dc.identifier.scopuseid_2-s2.0-85067200497-
dc.identifier.hkuros298365-
dc.identifier.volume99-
dc.identifier.issue22-
dc.identifier.spagearticle no. 224407, p. 1-
dc.identifier.epagearticle no. 224407, p. 9-
dc.identifier.isiWOS:000470827900002-
dc.publisher.placeUnited States-

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