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利用电化学结晶的方法制备了高质量的(BEDT-TTF)[FeBr4]单晶, 通过四圆单晶衍射确定了其晶体结构为三斜晶系. 在高温区, 晶体电阻率与电子的热激发效率以及载流子受电离杂质散射的强弱有关. 在低温区, 晶体的导电性只依赖体内杂质缺陷等的电离. 由于电子受到Lorentz力的作用增加了与晶格的碰撞次数, 晶体的磁阻率表现为正值. 晶体的磁性主要由三价铁离子决定, 晶体中三价铁离子之间不具有铁磁耦合或反铁磁耦合. 电子顺磁共振谱中同时发现电子和d电子的共振信号, 温度降低可使电子和d电子的耦合作用增强, 晶体沿着不同轴旋转, 其共振信号随旋转角度的变化存在着巨大的差异.
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关键词:
- (BEDT-TTF)[FeBr4]晶体 /
- 导电性 /
- 磁共振
(BEDT-TTF)[FeBr4] single crystal is grown with electrochemical crystallization method, and its crystal structure is determined by four-circle single crystal diffraction. From 300 K to 185 K, the crystal resistivity is related to the efficiency of electronic thermal excitation and the strength of the electron scattering by ionized impurities, while from 185 K to 10 K, the conductivity depends mainly on the ionization of the impurities and defects in crystal. Because of electron scattering increased by the effect of Lorentz force, the magnetic reluctance has positive value. The magnetism of the crystal is determined mainly by magnetic ferric ions, and neither ferrromagnetic coupling nor antiferromagnetic coupling between the ferric ions in crystalis induced. The resonance signals of the electrons and the d electrons are found in the electron paramagnetic resonance spectra, and the -d coupling is enhanced as the temperature is decreased. When the crystal rotates along different axes, the resonance signal changed with the angle of rotation, is greatly different.-
Keywords:
- (BEDT-TTF)[FeBr4] crystal /
- conductivity /
- magnetic resonance
[1] Han W, Chang S Q, Dai Y D, Chen D, Huang Y J 2008 Acta Phys.Sin. 57 2493 (in Chinese) [韩薇, 常树全, 戴耀东, 陈达, 黄彦君 2008 物理学报 57 2493]
[2] Coronado E, Galan-Mascaros J R, Gimenez-Saiz C, Gomez-Garcia C J, Laukhin V N 1996 Adv. Mater. 8 801
[3] Sano K, Sasaki T, Yoneyama N, Kobayashi N 2010 Phys. Rev.Lett. 104 217003
[4] Marsden I R, Allan M L, Friend R H, Kurmoo M, Kanazawa D,Day P, Bravic G, Chasseau D, Ducasse L, Hayes W 1994 Phys.Rev. B 50 2118
[5] Houzet M, Buzdin A, Bulaevskii L, Maley M 2002 Phys. Rev.Lett. 88 227001
[6] Coronado E, Galan-Mascaros J R, Gomez-Garcia C J, Laukhin V2000 Nature 408 447
[7] Waerenborgh J C, Rabaca S, Almeida M, Lopes E B, KobayashiA, Zhou B, Brooks J S 2010 Phys. Rev. B 81 060413
[8] Xin X G, Chen X, Zhou J J, Shi S Q 2011 Acta Phys. Sin. 60028201 (in Chinese) [忻晓桂, 陈香, 周晶晶, 施思齐 2011 物理学报 60 028201]
[9] Day P, Kurmoo M, Mallaht T, Marsden I R, Friend R H, Pratt FL, Hayes W, Chasseau D, Gaultier J, Bravic G, Ducasse L 1992 J.Am. Chem. Soc. 114 10722
[10] Mallah T, Hollis C, Bott S 1990 J. Chem. Soc. Dalton. Trans. 859
[11] Kobayashi H, Tomita H, Naito T, Kobayashi A, Sakai F,WatanabeT, Cassoux P 1996 J. Am. Chem. Soc. 118 368
[12] Mansfield R 1956 Proc. Phys. Soc. B 69 76
[13] Olson R, Rodriguez S 1957 Phys. Rev. 108 1212
[14] Chambers R G 1952 Proc. Phys. Soc. London. Sect. A 65 903
[15] Matsushita M M, Kawakami H, Kawada Y, Sugawara T 2007Chem. Lett. 36 1
[16] Yan Y G, Tang X F, Liu H J, Yin L L, Zhang Q J 2007 Acta Phys.Sin. 56 3473 (in Chinese) [鄢永高, 唐新峰, 刘海君, 尹玲玲,张清杰 2007 物理学报 56 3473]
[17] Umeya M, Kawata S, Matsuzaka H, Kitagawa S, Nishikawa H,Kikuchi K, Ikemoto I 1998 J. Mater. Chem. 8 295
[18] Seehra M S, Gupta R P 1974 Phys. Rev. B 9 197
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[1] Han W, Chang S Q, Dai Y D, Chen D, Huang Y J 2008 Acta Phys.Sin. 57 2493 (in Chinese) [韩薇, 常树全, 戴耀东, 陈达, 黄彦君 2008 物理学报 57 2493]
[2] Coronado E, Galan-Mascaros J R, Gimenez-Saiz C, Gomez-Garcia C J, Laukhin V N 1996 Adv. Mater. 8 801
[3] Sano K, Sasaki T, Yoneyama N, Kobayashi N 2010 Phys. Rev.Lett. 104 217003
[4] Marsden I R, Allan M L, Friend R H, Kurmoo M, Kanazawa D,Day P, Bravic G, Chasseau D, Ducasse L, Hayes W 1994 Phys.Rev. B 50 2118
[5] Houzet M, Buzdin A, Bulaevskii L, Maley M 2002 Phys. Rev.Lett. 88 227001
[6] Coronado E, Galan-Mascaros J R, Gomez-Garcia C J, Laukhin V2000 Nature 408 447
[7] Waerenborgh J C, Rabaca S, Almeida M, Lopes E B, KobayashiA, Zhou B, Brooks J S 2010 Phys. Rev. B 81 060413
[8] Xin X G, Chen X, Zhou J J, Shi S Q 2011 Acta Phys. Sin. 60028201 (in Chinese) [忻晓桂, 陈香, 周晶晶, 施思齐 2011 物理学报 60 028201]
[9] Day P, Kurmoo M, Mallaht T, Marsden I R, Friend R H, Pratt FL, Hayes W, Chasseau D, Gaultier J, Bravic G, Ducasse L 1992 J.Am. Chem. Soc. 114 10722
[10] Mallah T, Hollis C, Bott S 1990 J. Chem. Soc. Dalton. Trans. 859
[11] Kobayashi H, Tomita H, Naito T, Kobayashi A, Sakai F,WatanabeT, Cassoux P 1996 J. Am. Chem. Soc. 118 368
[12] Mansfield R 1956 Proc. Phys. Soc. B 69 76
[13] Olson R, Rodriguez S 1957 Phys. Rev. 108 1212
[14] Chambers R G 1952 Proc. Phys. Soc. London. Sect. A 65 903
[15] Matsushita M M, Kawakami H, Kawada Y, Sugawara T 2007Chem. Lett. 36 1
[16] Yan Y G, Tang X F, Liu H J, Yin L L, Zhang Q J 2007 Acta Phys.Sin. 56 3473 (in Chinese) [鄢永高, 唐新峰, 刘海君, 尹玲玲,张清杰 2007 物理学报 56 3473]
[17] Umeya M, Kawata S, Matsuzaka H, Kitagawa S, Nishikawa H,Kikuchi K, Ikemoto I 1998 J. Mater. Chem. 8 295
[18] Seehra M S, Gupta R P 1974 Phys. Rev. B 9 197
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