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Ising-Like Antiferromagnetism on the Octahedral Sublattice of a Cobalt-Containing Garnet and the Potential for Quantum Critically

Published

Author(s)

Abbey J. Neer, Joanna Milam-Guerrero, Justin E. So, Brent C. Melot, Kate Ross, Zeric Hulvey, Craig Brown, Alexey A. Sokol, David O. Scanlon

Abstract

In this letter, we report the observation of quasi-one-dimensional magnetism in the garnet CaY2Co2Ge3O12. Using low-temperature powder neutron diffraction and symmetry analysis, we identify a magnetic structure consisting of chain-like motifs oriented along the body diagonals of the cubic unit cell with moments pointing parallel to the chain direction due to the strong magnetocrystalline anisotropy of the Co ions. Antiferromagnetic order sets in below 6 K and exhibits complex temperature- and field-induced magnetic transitions at high fields. Combining the results, we present a magnetic phase diagram that suggests CaY2Co2Ge3O12 exhibits a quantum critical phase transition at low temperatures and moderate fields, indicating that despite the cubic nuclear symmetry the magnetic ions clearly behave as a chain of Ising moments.
Citation
Physical Review B
Volume
95
Issue
14

Keywords

Neutron diffraction, structure, garnet

Citation

Neer, A. , Milam-Guerrero, J. , So, J. , Melot, B. , Ross, K. , Hulvey, Z. , Brown, C. , Sokol, A. and Scanlon, D. (2017), Ising-Like Antiferromagnetism on the Octahedral Sublattice of a Cobalt-Containing Garnet and the Potential for Quantum Critically, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921706 (Accessed April 21, 2024)
Created April 13, 2017, Updated October 12, 2021