[seminar] seminar FO, Narduzzo

[hbuljan at phy.hr]

Poštovani kolege,

idući utorak s početkom u 14:15 sati predavanje će
nam održati Dr. A. Narduzzo sa Leibniz instituta u Dresdenu.
Tema predavanja jest "Transport properties of quasi-one- and
quasi-two-dimensional cuprates". Sažetak se nalazi u nastavku
poruke.

Srdačan pozdrav,
Hrvoje Buljan

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SEMINAR FIZIČKOG ODSJEKA
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Vrijeme:   utorak, 22. 04. 2008., 14:15 sati (točno)
Mjesto:     Fizički odsjek, Bijenička 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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