Magnetic phase diagram of a molecule-based ferrimagnet: weak ferromagnetism and multiple dimensionality crossovers

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Publication Type Journal Article
School or College College of Science
Department Chemistry
Creator Miller, Joel Steven; Epstein, Arthur J.
Other Author Wynn, C. M.; Gîrtu, M. A.
Title Magnetic phase diagram of a molecule-based ferrimagnet: weak ferromagnetism and multiple dimensionality crossovers
Date 1997
Description A detailed study of the magnetic behavior of the molecule-based magnet, [MnOEP][HCBD], (OEP=mesooctaethylporphyrinato, HCBD=hexacyanobutadiene) from 1.7 to 20 K was performed. The earlier reported magnetic transition at 19.6 K, ascribed to a crossover from a one-dimensional Heisenberg-like ferrimagnet to a two-dimensional Ising-like antiferromagnet, is further probed via ac-dc magnetic studies consisting of dc magnetization as a function of field at various temperatures, and magnetization as a function of temperature with both field cooling and zero-field cooling. In addition, the ac susceptibility was measured as a function of temperature and applied dc field. The appearance of a nonzero out-of-phase component of the ac susceptibility in zero dc field at 8 K accompanied by a shoulder in the in-phase component indicates the presence of a magnetic transition near that temperature. Irreversibilities and a spontaneous moment observed below 4.2 K indicate an additional lower temperature transition. The ac and dc data allow a determination of the temperature-field phase boundaries around these transitions. Evidence of a tricritical point at 2 kOe and 19.6 K and a multicritical point at 9.5 kOe and 8 K is presented. The nature of the ordered states, along with the possible mechanisms responsible for the transitions, including dipole-dipole interactions, are analyzed. [S0163-1829(97)02446-6]
Type Text
Publisher American Physical Society
Volume 56
Issue 21
First Page 14050
Last Page 14057
Subject Transition; Temperature; Magnetization
Language eng
Bibliographic Citation Wynn, C. M, Gîrtu, M. A., Miller, J. S., & Epstein, A. J. (1997). Magnetic phase diagram of a molecule-based ferrimagnet: weak ferromagnetism and multiple dimensionality crossovers. Physical Review B, 56(21), 14050-57.
Rights Management (c) American Physical Society
Format Medium application/pdf
Format Extent 180,633 bytes
Identifier ir-main,5393
ARK ark:/87278/s6rn3s4b
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2012-06-13
ID 704130
Reference URL https://collections.lib.utah.edu/ark:/87278/s6rn3s4b
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