Heat capacity study of the doping effect of paramagnetic radicals on the organic spin-peierls system (p-CyDOV radical crystal)

The doping effect of paramagnetic organic radical impurities (p-CyDTV) on the organic spin-Peiels (SP) system of p-CyDOV (3-(4-cyanophenyl)-1,5-dimethyl-6-oxoverdazyl; the SP transition temperature TSP=15.0 K) was studied by the heat capacity measurement down to 0.1 K. At low temperatures below 1 K,...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2003-09, Vol.72 (9), p.2312-2316
Main Authors: MUKAI, Kazuo, YANAGIMOYO, Masanobu, TANAKA, Shuichi, MITO, Masaki, KAWAE, Tatsuya, TAKEDA, Kazuyoshi
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Molecular magnets
Physics
Studies of specific magnetic materials
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Summary:The doping effect of paramagnetic organic radical impurities (p-CyDTV) on the organic spin-Peiels (SP) system of p-CyDOV (3-(4-cyanophenyl)-1,5-dimethyl-6-oxoverdazyl; the SP transition temperature TSP=15.0 K) was studied by the heat capacity measurement down to 0.1 K. At low temperatures below 1 K, quite a sharp heat capacity peak was detected for each system with small impurity concentration (x) at the temperature TN(x); TN(0)=0.135 K (±0.002 K), TN(0.01)=0.290 K and TN(0.07)=0.164 K. The appearance of the peak for the system with x=0 is considered to be due to minute and inevitable impurities in the pure p-CyDOV. From the dependence of TN(x), TN(0)
ISSN:0031-9015
1347-4073
DOI:10.1143/JPSJ.72.2312