Resistivity and magnetoresistance of the organic superconductor β (BEDT-TTF)2I3 at ambient pressure for current flow along the C∗ axis. Cooper, J., R., Forró, L., & Schweitzer, D. Synthetic Metals, 19(1-3):1002, 3, 1987.
Resistivity and magnetoresistance of the organic superconductor β (BEDT-TTF)2I3 at ambient pressure for current flow along the C∗ axis [link]Website  abstract   bibtex   
We have measured the resistivity from 300 to 4.2 K and the magnetoresis-tance from 25 to 4.2 K in magnetic fields (H) up to 6 Tesla for three single crystals of ~(BEDT-TTF) 2I 3 with current flow along the least conducting C ~ di-rection. There is an S shaped anomaly in p_~(T) starting near 180 K which we ascribe to the phase transition seen in X-ray studies [1,2]. From 9-1OO K pC ~ obeys an A + BT 2 low while below 9 K the three samples show broad superconduc-ting transitions with p(4.2)/p(9) values of 0.4, 0.ii and < O.O1. From the ma-gnitude and angular dependence of the magnetoresistance above 9 K we conclude that the Fermi surface is just open in the a.b plane which is in contrast to other published work. From the measured angular dependence, and taking inter and intra stack molecular spacings of 6.2 and 4.1 ~ , the ratio of transfer integrals in the a.b plane is t,,/tl = 3.5~ ± 0.12 . We also find that Kohler's b rule is obeyed from ~-25 K and using the same analysis [3] as for the Bechgaard salts, we obtain t± c ~ 2 meV and a parallel mean free path of approximately 200 intermolecular distances at 9 K. Below 8 K the angular dependence of p^e(H) is still well defined and the Pc,(T) curves are independent of current density and thermal cycling to room temperature. Therefore the smeared superconducting transitions may perhaps re-present some kind of "weak" superconductivity extending throughout the crys-tals rather than small regions of the high T phase as some authors have pro-posed, c REFERENCES 1 J.
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 title = {Resistivity and magnetoresistance of the organic superconductor β (BEDT-TTF)2I3 at ambient pressure for current flow along the C∗ axis},
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 year = {1987},
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 pages = {1002},
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 abstract = {We have measured the resistivity from 300 to 4.2 K and the magnetoresis-tance from 25 to 4.2 K in magnetic fields (H) up to 6 Tesla for three single crystals of ~(BEDT-TTF) 2I 3 with current flow along the least conducting C ~ di-rection. There is an S shaped anomaly in p_~(T) starting near 180 K which we ascribe to the phase transition seen in X-ray studies [1,2]. From 9-1OO K pC ~ obeys an A + BT 2 low while below 9 K the three samples show broad superconduc-ting transitions with p(4.2)/p(9) values of 0.4, 0.ii and < O.O1. From the ma-gnitude and angular dependence of the magnetoresistance above 9 K we conclude that the Fermi surface is just open in the a.b plane which is in contrast to other published work. From the measured angular dependence, and taking inter and intra stack molecular spacings of 6.2 and 4.1 ~ , the ratio of transfer integrals in the a.b plane is t,,/tl = 3.5~ ± 0.12 . We also find that Kohler's b rule is obeyed from ~-25 K and using the same analysis [3] as for the Bechgaard salts, we obtain t± c ~ 2 meV and a parallel mean free path of approximately 200 intermolecular distances at 9 K. Below 8 K the angular dependence of p^e(H) is still well defined and the Pc,(T) curves are independent of current density and thermal cycling to room temperature. Therefore the smeared superconducting transitions may perhaps re-present some kind of "weak" superconductivity extending throughout the crys-tals rather than small regions of the high T phase as some authors have pro-posed, c REFERENCES 1 J.},
 bibtype = {article},
 author = {Cooper, J. R. and Forró, László and Schweitzer, D.},
 journal = {Synthetic Metals},
 number = {1-3}
}
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