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NMR study of magnetic order, metamagnetic transitions, and low-temperature spin freezing in Ca_{3}Co_{2}O_{6}
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Allodi, G., De Renzi, R., Agrestini, Stefano, Mazzoli, Claudio and Lees, Martin R. (2012) NMR study of magnetic order, metamagnetic transitions, and low-temperature spin freezing in Ca_{3}Co_{2}O_{6}. Physical Review B (Condensed Matter and Materials Physics), Volume 83 (Number 10). p. 104408. doi:10.1103/PhysRevB.83.104408 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.83.104408
Abstract
We report on a (59)Co NMR investigation of the trigonal cobaltate Ca(3)Co(2)O(6) carried out on a single crystal, providing precise determinations of the electric field gradient and chemical shift tensors, and of the internal magnetic fields at the nonmagnetic Co I sites, unavailable from former studies on powders. The magnetic-field-induced ferri-and ferromagnetic phases at intermediate temperature (e.g., 10 K) are identified by distinct internal fields, well accounted for by purely dipolar interactions. The vanishing transferred hyperfine field at the Co I site indicates that the Co(3+) (I) orbitals do not participate in the intrachain superexchange, in disagreement with a previous theoretical model. The strong Ising character of the system is confirmed experimentally by the field dependence of the resonance lines, indicating that local moments are saturated even at the phase boundaries. In the vicinity of the critical fields, nuclear spin-spin relaxations detect the spin-reversal dynamics of large magnetic assemblies, either Ising chain fragments or finite-size domains, which drive the metamagnetic transitions. Such collective excitations exhibit a glassy behavior, slowing down to subacoustic frequencies and freezing at low temperature. The relevance of such slow-fluctuation modes for the low-temperature multistep behavior reported in the magnetization is discussed.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Nuclear magnetic resonance, Cobalt compounds -- Magnetic properties, Spin temperature, Thermoelectric materials, Ising model | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 14 February 2012 | ||||
| Dates: |
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| Volume: | Volume 83 | ||||
| Number: | Number 10 | ||||
| Page Range: | p. 104408 | ||||
| DOI: | 10.1103/PhysRevB.83.104408 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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