Heat Capacity Study of the Doping Effect of Paramagnetic Radicals on the Organic Spin-Peierls System (p-CyDOV Radical Crystal)
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概要
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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 T_<sp> = 15.0 K) was studied by the heat capacity measurement down to 0.1 K. At low temperatures below 1 K, quite a sharp beat capacity peak was detected for each system with small impurity concentration (x) at the temperature T_N(x), T_N(0) = 0.135 K (±0.002 K), T_N(0.01) 0.290 K and T_N(0.07) = 0.164K. 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 T_N(x), T_N(0) < T_N(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 T_N(x) for higher impurities x = 0.07 than that for x = 0.01 may be interpreted as merely a 3D AEM transition from the paramagnetic state in the quasi-ID systems with the interchain interaction ∣ zJ'/J ∣ = 6 × 10^<-4>. Although no anomaly of the heat capacity was found around T'_<SP>(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 T'_<SP>(0) = 5.6 K and T'_<SP>(0.01) 5.3 K with magnetic entropy consumption up to 3%, suggesting that this transition may relate to SP transition.
- 社団法人日本物理学会の論文
- 2003-09-15
著者
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KAWAE Tatsuya
Department of Applied Quantum Physics, Kyushu University
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TAKEDA Kazuyoshi
Department of Applied Quantum Physics, Kyushu University
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Takagi S
Department Of Quantum Matter Graduate School Of Advanced Sciences Of Matter Hiroshima University
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Tsutsui Satoshi
Japan Synchrotron Radiation Research Institute Spring-8
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榊原 俊雄
東大物性研
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山下 護
徳島工短
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山下 護
Department Of Physics Engineering Faculty Of Engineering Mie University
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Tsutsui Satoshi
Department Of Materials Science And Technology Iwate University
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Suzuki T
Issp University Of Tokyo
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Saito T
Faculty Of Engineering Kyushu Institute Of Technology
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Sasaki T
Center For Geo-environmental Science Faculty Of Engineering And Resource Science Akita University
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TANAKA Shuichi
Department of Physics, Kyushu University
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MITO Masaki
Department of Electronics, Faculty of Engineering, Kyushu Institute of Technology
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MUKAI Kazuo
Department of Chemistry, Faculty of Science, Ehime University
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YANAGIMOYO Masanobu
Department of Chemistry, Faculty of Science, Ehime University
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Tatsuoka Sho
Graduate School Of Science Tokyo Metropolitan University
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Suzuki N
Riken (inst. Physical And Chemical Res.) Saitama
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Suzuki N
Osaka Univ. Osaka Jpn
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Suzuki Naoshi
Department Of Material Physics Osaka University
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Sugaya Takashi
Issp University Of Tokyo
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Sakon Takuo
Department Of Physics Faculty Of Science Tohoku University
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Suzuki T
Graduate School Of Science And Technology Chiba University
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Yamashita Makoto
Department Of Applied Physics Osaka University
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Kawae Tatsuya
Department Of Applied Science Faculty Of Engineering Kyusyu University
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Kawae Tatsuya
Department Of Applied Quantum Physics Kyushu University
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Tsutsui Satoshi
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Tanaka Shuichi
Department Of Physics Kyushu University
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Mitome Masanori
National Institute Of Materials Science
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Motokawa Mitsuhiro
Crest Japan Science And Technology:institute For Material Research Tohoku University
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Suzuki Taira
Department Of Mterials Science And Technology Science University Of Tokyo
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Takahashi Keita
Department Of Applied Science Faculty Of Engineering Kyushu University
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Takeda Kosei
Electro-chemical And Cancer Institute
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Mukai Kazuo
Department Of Chemistry Faculty Of Science Ehime University
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Yanagimoyo Masanobu
Department Of Chemistry Faculty Of Science Ehime University
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Mino M
Okayama Univ. Okayama
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Mukai K
Department Of Chemistry Faculty Of Science Ehime University
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Mukai Kazuo
Dep. Of Chemistry Fac. Of Sci. Ehime Univ.
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向井 和男
愛媛大・理・化学
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Tanaka Shuichi
Department Of Pediatric Surgery Central Hospital
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Takeda Kazuyoshi
Department Of Applied Quantum Physics Faculty Of Engineering Kyushu University:institute Of Environm
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Saito Takashi
Institute For Chemical Research Kyoto University
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