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Magnetic properties of geometrically frustrated SrGd2O4
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Young, Olga, Balakrishnan, Geetha, Lees, Martin R. and Petrenko, Oleg (2014) Magnetic properties of geometrically frustrated SrGd2O4. Physical Review B (Condensed Matter and Materials Physics), Volume 90 (Number 9). 094421. doi:10.1103/PhysRevB.90.094421
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Official URL: http://dx.doi.org/10.1103/PhysRevB.90.094421
Abstract
A study of the magnetic properties of the frustrated rare-earth oxide SrGd2O4 has been completed using bulk property measurements of magnetization, susceptibility, and specific heat on single-crystal samples. Two zero-field phase transitions have been identified at 2.73 and 0.48 K. For the field H, applied along the a and b axes, a single boundary is identified that delineates the transition from a low-field, low-temperature magnetically ordered regime to a high-field, high-temperature paramagnetic phase. Several field-induced transitions, however, have been observed with H∥c. The measurements have been used to map out the magnetic phase diagram of SrGd2O4, suggesting that it is a complex system with several competing magnetic interactions. The low-temperature magnetic behavior of SrGd2O4 is very different compared to the other SrL2O4 (L = Lanthanide) compounds studied so far, even though all of the SrL2O4 compounds are isostructural, with the magnetic ions forming a low-dimensional lattice of zigzag chains that run along the c axis. The differences are likely to be due to the fact that in the ground state Gd3+ has zero orbital angular momentum and therefore the spin-orbit interactions, which are crucial for other SrL2O4 compounds, can largely be neglected. Instead, given the relatively short Gd3+–Gd3+ distances in SrGd2O4, dipolar interactions must be taken into account for this antiferromagnet alongside the Heisenberg exchange terms.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||
| Publisher: | American Physical Society | ||||||
| ISSN: | 1098-0121 | ||||||
| Official Date: | 29 September 2014 | ||||||
| Dates: |
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| Volume: | Volume 90 | ||||||
| Number: | Number 9 | ||||||
| Article Number: | 094421 | ||||||
| DOI: | 10.1103/PhysRevB.90.094421 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Open Access Version: |
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