[seminar] Seminar FO, Grafe

[hbuljan at phy.hr]

Ispričavam se na dvostrukom mailu, seminar je 26.06. u utorak u 14.15 na
FO, soba F201.
HB

> Poštovani kolege,
>
> idući utorak 26.06. seminar naslovljen "New NMR results in the
> prototypical high temperature superconductors La2xSrxCuO4 and YBa2Cu3Oy"
> održati će nam H-J. Grafe iz Dresdena (vidi sažetak). Predavanje će se
> održati na Fizičkom odsjeku PMFa u predavaonici F201 s početkom u 14.15
> sati. Posjeta Dr. Grafe odvija se u sklopu suradnje na SOLeNeMaR projektu
> kolege M. Požeka.
>
> Srdačan pozdrav
> H. Buljan
>
> ------------------------------------------
> SEMINAR FIZIČKOG ODSJEKA
> ------------------------------------------
>
> Vrijeme:   utorak, 26. 6. 2012., 14:15 sati (točno)
> Mjesto:    Fizički odsjek, Bijenička c. 32, predavaonica F201
>
> New NMR results in the prototypical high
> temperature superconductors La2xSrxCuO4 and YBa2Cu3Oy
>
>       Hans-Joachim Grafe
> Leibniz Institute for Solid State Research, Dresden Germany
>
>
> Even after 25 years of intense research on the high temperature
> superconducting cuprates it is still possible to either prove findings
> which were not generally accepted, or even to find totally new results
> which were not known before. In my talk, I will present new NMR results on
> the prototypical HTSC compounds La2-xSrxCuO4 and YBa2Cu3Oy. In the first
> compound, we could recently prove that the average low temperature
> orthorhombic structure as determined by x-ray scattering is fully
> compatible with its local structure determined by a local probe as NMR
> [1]. In the second compound, we explored the highly underdoped regime
> (y=6.35-6.6), and found a new NMR signal which proves the emergence of a
> static order below a critical hole doping of p_c ~ 0.095 [2].
> Surprisingly, the pseudogap as determined by the NMR spin lattice
> relaxation appears only above this critical doping level. Our data
> suggests that a possibly stripe-like static order competes with the
> spin-pseudogap phase, whereby both are separated by a critical hole doping
> p_c.
>
> [1] S.-H. Baek, A. Erb, B. Büchner, and H.-J. Grafe, Phys. Rev. B 85,
> 184508 (2012)
> [2] S.-H. Baek, T. Loew, V. Hinkov, C. T. Lin, B. Keimer, B. Büchner, and
> H.-J. Grafe, to be published
> -----------------------------------------------
>
>
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