Schedule Nov 19, 2002
Hot and cold spots of the electron relaxation time in Q1D organic conductors and in curates
Victor Yakovenko, University of Maryland
http://www2.physics.umd.edu/~yakovenk
Electronic transport properties are discussed using a model where the electron relaxation time strongly varies around the Fermi surface. For Q1D conductors, we calculate the distribution of the umklapp relaxation time and find the so-called "hot spots" at low temperatures. This model produces good quantitative fits of the temperature dependence of resistivity and Hall coefficient in the organic conductor (TMTSF)2PF6. For cuprates, a phenomenological model with "cold spots" at the Brillouin zone diagonals is useful for describing dc and ac magnetotranspot, such as Hall effect.

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