J. Phys. IV France
Volume 131, December 2005
Page(s) 265 - 268
Publié en ligne 18 janvier 2006
International Workshop on Electronic Crystals
S. Brazovskii, P. Monceau and N. Kirova
J. Phys. IV France 131 (2005) 265-268

DOI: 10.1051/jp4:2005131067

Incoherent versus coherent interlayer transport in layered conductors under a magnetic field

M. Kartsovnik1, S. Simonov2, D. Andres1, W. Biberacher1, N. Kushch3, H. Müller4 and I. Sheikin5

1  Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Strasse 8, 85748 Garching, Germany
2  Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russian Federation
3  Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russian Federation
4  European Synchrotron Radiation Facility, 38043 Grenoble, France
5  Grenoble High Magnetic Field Laboratory, CNRS, BP. 166, 38042 Grenoble, France

Comparative studies of the interlayer magnetoresistance of the layered organic conductor $\alpha$-(BEDT-TTF)2KHg(SCN)4 as a function of the magnetic field orientation have been performed on different samples. The results obtained on the high quality crystal reveal a well defined three-dimensional Fermi surface and provide an evaluation of the interlayer transfer integral, $t_{\bot
}\cong 0.04$ meV. The lower quality crystal exhibits a very different behavior which is most likely caused by the breakdown of the three-dimensional coherence, when the scattering rate $\tau
^{-1}$ exceeds the interlayer hopping rate $\sim t_{\bot }/\hbar $.

© EDP Sciences 2005