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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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
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Language:English
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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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cited_by cdi_FETCH-LOGICAL-c483t-eb76c2a42824882c74937c678ae3486844440652e5124f42bc4da4f9cc21212e3
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container_title Journal of the Physical Society of Japan
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creator MUKAI, Kazuo
YANAGIMOYO, Masanobu
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description 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)
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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)&lt;TN(0.01), and the heat capacity behavior on x, the peaks for x=0 and 0.01 are explained to be accompanied with the three-dimensional (3D) antiferromagnetic (AFM) transition in the SP phase. While the decrease of TN(x) for higher impurities x=0.07 than that for x=0.01 may be interpreted as merely a 3D AFM transition from the paramagnetic state in the quasi-1D systems with the interchain interaction |zJ'/J|=6×10-4. 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Although no anomaly of the heat capacity was found around TSP(x)=13-15 K in the present systems, where the characteristic decrease of the magnetic susceptibility is reported, we observed a distinct hump of the heat capacity at TSP'(0)=5.6 K and TSP'(0.01)=5.3 K with magnetic entropy consumption up to 3%, suggesting that this transition may relate to SP transition.</abstract><cop>Tokyo</cop><pub>Institute of Pure and Applied Physics</pub><doi>10.1143/JPSJ.72.2312</doi><tpages>5</tpages></addata></record>
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source American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
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
title Heat capacity study of the doping effect of paramagnetic radicals on the organic spin-peierls system (p-CyDOV radical crystal)
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