Phys. Rev. B 66, 212412 (2002) [4 pages]Dielectric behavior of manganese(III) spin-crossover complex [Mn(taa)] |
Motohiro Nakano * and Gen-etsu Matsubayashi †
Department of Molecular Chemistry & Frontier Research Center, Graduate School of Engineering, Osaka University, Toyonaka, Osaka 560-0043, Japan
Takasuke Matsuo ‡
Department of Chemistry & Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
Received 29 July 2002; published 31 December 2002
Paraelectric behavior due to a dynamic Jahn-Teller (JT) effect is reported for the manganese(III) spin-crossover complex [Mn(taa)] [H3taa=tris(1-(2-azolyl)-2-azabuten-4-yl)amine] in the high-spin (HS) phase above Tc=48 K. The dielectric constant obeys the Curie-Weiss law with an asymptotic Curie temperature 26 K, suggesting competition between a low-spin (LS) phase and a ferrodistortively ordered (FO) phase at low temperatures. A phase diagram based on a four-state Ising-Potts model incorporating both a virtual cooperative JT transition (HS↔FO) and a spin-crossover transition (HS↔LS) is proposed to elucidate the interrelation of the HS, LS, and FO phases.
©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v66/e212412
DOI: 10.1103/PhysRevB.66.212412
PACS: 77.22.-d, 31.70.Ks, 64.70.Kb, 71.70.Ej
* Email address: moto@ch.wani.osaka-u.ac.jp
† Email address: matsu@ch.wani.osaka-u.ac.jp
‡ Email address: matsuo@chem.sci.osaka-u.ac.jp
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