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

Published

April 14, 2017

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

Pub Type

Journals

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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 October 25, 2025)