[seminar] seminar FO, Narduzzo

[Hrvoje Buljan]

Po?tovani kolege,

podsjecam na danasnji seminar.

Srda?an pozdrav,
Hrvoje Buljan

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SEMINAR FIZI?KOG ODSJEKA
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Vrijeme:   utorak, 22. 04. 2008., 14:15 sati (to?no)
Mjesto:     Fizi?ki odsjek, Bijeni?ka c. 32, predavaonica F08

   Transport properties of quasi-one- and quasi-two-dimensional cuprates

                          Dr. Alessandro Narduzzo

                    Leibniz Institute for Solid State and
                    Materials Research, Dresden, Germany

Many of the remarkable physical properties of systems containing low
dimensional copper oxide chains and planes still lack an explanation.  In
this talk I will present two recent electrical transport studies on
cuprate single crystals that shed light on their peculiar features and  on
the scope of applicability of Fermi liquid theory as a successful
descriptive framework. In the first part of the talk, an investigation of
the metallic ground  state of the extremely anisotropic
quasi-one-dimensional metal  PrBa_2Cu_4O_8 (t_b^2: t_a^2: t_c^2 ~ 4000: 2:
1), as a function of  temperature, magnetic field and disorder content
will be presented. A  specific electronic state, labelled frustrated
metallicity, is  identified in this compound for a certain well defined
range of  disorder [1, 2, 3]. In the second part of the talk, experiments
and modelling of the  temperature dependence of resistivity \rho, Hall
coefficient R_H and magnetoresistance MR in the heavily overdoped
non-superconducting  metal La_{1.7}Sr_{0.3}CuO_{4} will be presented and
discussed. The analysis implies a breakdown of the isotropic-\ell
approximation at  low temperatures in this quasi-two-dimensional system, a
result that  may have important implications for our understanding of the
low-T  Hall coefficient across the entire phase diagram of the
high-temperature superconducting cuprates [4, 5].

[1] New J. Phys. 8 (2006) 172-183;
[2] Phys. Rev. Lett. vol. 99, 136402 (2007);
[3] Phys. Rev. Lett. vol. 98, 146601 (2007).
[4] N.E.Hussey, Treatise on High Temperature Superconductivity, Ed.
J.R. Schrieffer, (Springer Verlag, Amsterdam, 2006);
[5] http://arxiv.org/abs/0707.4601


 					Voditelj seminara FO
 					Hrvoje Buljan, hbuljan at phy.hr
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