Complex antiferromagnetic order in the garnet C o3 A l2 S i3 O12

Q. Cui, Q. Huang, Jose A. Alonso, Denis Sheptyakov, C. R. De La Cruz, M. T. Fernández-Díaz, N. N. Wang, Y. Q. Cai, D. Li, X. L. Dong, H. D. Zhou, J. G. Cheng

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Abstract

We studied the magnetic properties of the garnet Co3Al2Si3O12 synthesized under 5.5 GPa and 1250 °C by means of dc magnetic susceptibility, neutron powder diffraction, and specific heat. Although the magnetic Co2+ ions form a geometrically frustrated hyper-Kagome lattice, we find that Co3Al2Si3O12 exhibits a long-range antiferromagnetic order below TN=11K without showing magnetic frustration, i.e., the frustration index f|θCW/TN| is close to unity. Refinements from neutron-diffraction data show that Co3Al2Si3O12 forms a complex antiferromagnetic structure characterized by the coexistence of collinear and commensurate spiral magnetic ordering of Co2+ sublattices. Magnetic field induced spin-flop transition at μ0Hc≈4T was also observed below TN.

Original languageEnglish
Article number144424
JournalPhysical Review B
Volume101
Issue number14
DOIs
StatePublished - Apr 1 2020

Funding

Work at IOPCAS is supported by the National Key Research and Development Program of China (Grant No. 2018YFA0305700), the National Natural Science Foundation of China (Grants No. 11921004, No. 11834016, and No. 11874400), the Beijing Natural Science Foundation (Grant No. Z190008), the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (CAS, Grants No. XDB25000000 and No. QYZDB-SSW-SLH013), and the CAS Interdisciplinary Innovation Team (Grant No. JCTD-2019-001). J.A.A. gratefully acknowledges the Spanish MINECO for granting Project No. MAT2017-84496-R. Q.H. and H.D.Z. acknowledge support from NSF-DMR through Grant No. DMR-1350002. The research at HFIR/ORNL was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. We are grateful to the Institut Laue-Langevin for making neutron beam time available.

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