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J. Phys. Soc. Jpn. 77 (2008) 124713 (6 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Pressure-Induced Ferromagnetic to Nonmagnetic Transition and the Enhancement of Ferromagnetic Interaction in the Thiazyl-Based Organic Ferromagnet γ-BBDTA·GaCl4

Masaki Mito, Masatsugu Fujino, Yuki Komorida, Hiroyuki Deguchi, Seishi Takagi, Wataru Fujita1, and Kunio Awaga2

Faculty of Engineering, Kyushu Institute of Technology, Kitakyushu 804-8550
1Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397
2Graduate School of Science, Nagoya University, Nagoya 464-8602

(Received August 5, 2008; Accepted October 14, 2008; Published December 10, 2008)

A thiazyl-based ferromagnet, the γ-phase of BBDTA (i.e., benzo[1,2-d:4,5-d']bis[1,3,2]dithiazole)·GaCl4, has a high ferromagnetic ordering temperature of 7.0 K in organic radical ferromagnets. In this system, pressurization generated more compact molecular packing, resulting in that the ferromagnetic state at P = 16.2 kbar is stabilized over a temperature range of more than twice of the initial range. However, the saturation magnetic moment was reduced with increasing pressure, decreasing to about 12% of the initial value even at the low pressure level of P = 1.0 kbar. This suggests that the ferromagnetic molecular packing of the monoclinic γ-phase is easily transformed into that of the diamagnetic phase. Powder X-ray diffraction experiments revealed that the diamagnetic non-monoclinic (α- or β-) phase became stable instead of the monoclinic γ-phase across the pressure of 2.5–5.8 kbar. The increase in the temperature of onset of ferromagnetic state occurs in the surviving ferromagnetic domain surrounded by the diamagnetic domains. ©2008 The Physical Society of Japan

KEYWORDS: organic radical ferromagnet, ordering temperature, pressure effects, structural transformation
URL: http://jpsj.ipap.jp/link?JPSJ/77/124713/
DOI: 10.1143/JPSJ.77.124713


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