Charge-ordering and magnetic phase transitions in theta-(BDT-TTP)(2)Cu(NCS)(2)

Charge-ordering and magnetic phase transitions in theta-(BDT-TTP)(2)Cu(NCS)(2)
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theta-(BDT-TTP)(2)Cu(NCS)(2) 中的电荷排序和磁相变

DOI:
10.1103/physrevb.66.235102
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发表时间:
2002
期刊:
影响因子:
3.7
通讯作者:
Katsuhisa Tanaka
Katsuhisa Tanaka
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
K. Yakushi;Kaoru Yamamoto;M. Simonyan;Jianyong Ouyang;C. Nakano;Y. Misaki;Katsuhisa Tanaka

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本文报道了θ-(BDT-TTP)2Cu(NCS)2的极化拉曼光谱和磁化率。根据v2带的分裂,估算出在10 K时的电荷极化率δ为0.4。v2的线宽反映了电荷分布在T C O以上的起伏.磁化率在30 K<T<300 K时符合居里-韦斯定律,居里常数为0.154 emuK/mol,韦斯温度为-29 K。单晶ESR实验表明,在5 K下,磁性相变为自旋单重态。极化拉曼光谱和磁性表明,正电荷沿b轴沿着垂直排列。
We present the polarized Raman spectra and magnetic susceptibility of θ-(BDT-TTP) 2 Cu(NCS) 2 which undergoes a charge-ordering phase transition at T C O ∼250 K. From the splitting of the v 2 band, the charge-disproportionation ratio δ is estimated as 0.4 at ∼10 K. The linewidth of v 2 suggests the fluctuation in charge distribution above T C O . he magnetic susceptibility of 30 K<T<300 K follows the Curie-Weiss Law with the Curie constant of 0.154 emuK/mol and Weiss temperature of -29 K. The single-crystal ESR experiment shows a magnetic phase transition to a spin-singlet state at 5 K. The polarized Raman spectra and magnetic property suggest the view that the positive charge is vertically ordered along the b-axis.
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期刊:
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