Upper critical field five times the Clogston paramagnetic limit in the organic superconductor (ET)4Hg2.89Br8
Lyubovskaya R. N. , Lyubovskii R. B. , Makova M. K. , Pesotskii S. I.
The temperature dependence of the upper critical fields has been studied in the organic superconductor (ET) 4Hg2.89 Br8. For the longitudinal critical field, a value five times the Clogston paramagnetic limit Hp (0) = 18.5 7"c has been observed. The temperature dependence of the transverse critical field has a positive curvature. Both these facts are linked with the possibility of a strong electron-phonon coupling in this superconductor.
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![](/ps/1140/article_17261_800_head.png "The temperature dependence of the upper critical fields has been studied in the organic superconductor (ET) <sub>4</sub>Hg<sub>2</sub>.<sub>89</sub> Br<sub>8</sub>. For the longitudinal critical field, a value five times the Clogston paramagnetic limit <i>H<sub>p</sub> </i>(0) = 18.5 7"<sub>c</sub> has been observed. The temperature dependence of the transverse critical field has a positive curvature. Both these facts are linked with the possibility of a strong electron-phonon coupling in this superconductor.")