Modulated magnetism and anomalous electronic transport in Ce3Cu4As4O2

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dc.citation.articleNumber64430en_US
dc.citation.issueNumber6en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber94en_US
dc.contributor.authorWang, Jiakui K.en_US
dc.contributor.authorWu, Shanen_US
dc.contributor.authorQiu, Yimingen_US
dc.contributor.authorRodriguez-Rivera, Jose A.en_US
dc.contributor.authorHuang, Qingzhenen_US
dc.contributor.authorBroholm, C.en_US
dc.contributor.authorMorosan, E.en_US
dc.date.accessioned2016-12-01T17:29:09Zen_US
dc.date.available2016-12-01T17:29:09Zen_US
dc.date.issued2016en_US
dc.description.abstractThe complex magnetism and transport properties of tetragonal Ce3Cu4As4O2 were examined through neutron scattering and physical property measurements on polycrystalline samples. The lamellar structure consists of alternating layers of CeCu4As4 with a single square Ce lattice and Ce2O2 bilayers. Peaks in the specific heat at the Néel temperature TN=24 K, T2=16 K, and T3=1.9 K indicate three magnetic phase transitions or distinct crossover phenomena. For T<TNneutron diffraction indicates the development of ferromagnetic ab sheets for both Ce sites, with alternating polarization along c, and a wave vector k1=c∗. For T<T2, quasi-two-dimensional low-energy spin fluctuations with k2=12a∗ and polarized perpendicular to k2 are suppressed. The data are consistent with quasi-two-dimensional antiferromagnetic order in the CeCu4As4 planes polarized along the k2 wave vector. T3 marks a spin-flop transition where the k1 staggered magnetization switches to in-plane polarization. There are significant transport anomalies associated with the transitions, in particular a substantial reduction in resistivity for T<TN. At T=100 mK the magnetic correlation length exceeds 75Å and the k1 modulated staggered moment is 0.85μB, which matches the 0.8μB saturation magnetization achieved for μ0H=7 T at T=2 K. We trace the unusual sequence of magnetic transitions to competing interactions and anisotropies in the alternating quasi-two-dimensional magnetic layers.en_US
dc.identifier.citationWang, Jiakui K., Wu, Shan, Qiu, Yiming, et al.. "Modulated magnetism and anomalous electronic transport in Ce3Cu4As4O2." <i>Physical Review B,</i> 94, no. 6 (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevB.94.064430.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.94.064430en_US
dc.identifier.urihttps://hdl.handle.net/1911/92731en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleModulated magnetism and anomalous electronic transport in Ce3Cu4As4O2en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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