Abstract
In this contribution, we report that CaY2Co2Ge3O12 exhibits an unusual anisotropic and chainlike antiferromagnetic arrangement of spins despite crystallizing in the highly symmetric garnet structure. Using low-temperature powder neutron diffraction and symmetry analysis, we identify a magnetic structure consisting of chainlike motifs oriented along the body diagonals of the cubic unit cell with moments pointing parallel to the chain direction due to the strong Ising character of the Co ions. Antiferromagnetic order sets in below 6 K and exhibits both temperature- and field-induced magnetic transitions at high fields. Combining the results, we present a magnetic phase diagram that suggests CaY2Co2Ge3O12 undergoes a quantum phase transition at low temperatures and moderate fields.
| Original language | English |
|---|---|
| Article number | 144419 |
| Journal | Physical Review B |
| Volume | 95 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 14 Apr 2017 |
Bibliographical note
Funding Information:A.J.N., J.M.G., J.S., and B.C.M. gratefully acknowledge support from the Office of Naval Research Grant No. N00014-15-1-2411 and fruitful discussions with Stephen Wilson at UC Santa Barbara. Computational work in this paper used the UCL Grace HPC Facility and the Archer UK National Supercomputing Service, which was accessed through the UK's HEC Materials Chemistry Consortium, funded by EPSRC (EP/L000202). The work at UCL was supported by EPSRC (EP/N01572X/1). D.O.S. and A.A.S. acknowledge J. A. B. Buckeridge and C. R. A. Catlow for many useful discussions. We acknowledge the support of the National Institute of Standards and Technology,U. S. Department of Commerce, in providing the neutron research facilities used in this work.
Publisher Copyright:
© 2017 American Physical Society.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics