[seminar] Izvanredan znanstveni seminar Hrvatskog fizikalnog drustva: DANAS 14:00 sati, F-102 (FO-PMF)

[Mihael S. Grbić]

Poštovani kolege,
*danas* će se izvanredno na *Fizičkom odsjeku u prostoriji F-102 u 
14:00* sati održati združeni znanstveni _seminar Hrvatskog fizikalnog 
društva i Fizičkog odsjeka.__
___
Gost predavač je *Clifford Hicks *sa Max-Planck-Institut fur Chemische 
Physik fester Stoffe, Dresden (Njemačka), a *p**redavanje se odnosi na 
napredak u postizanju uniaksijalnog tlaka i rezultati korištenja tehnike 
u jako koreliranim sustavima*. Sažetak slijedi:

"Strain-tuning of the Correlated Electron Materials Sr2RuO4 and Sr3Ru2O7

In this seminar I present results of uniaxial pressure experiments using 
a new piezoelectric-based apparatus, that can both compress and tension 
test samples, and that can apply much higher pressures, with greater 
homogeneity, than previous anvil-based techniques. I present results on 
Sr2RuO4, a superconductor with a Fermi surface that passes very close to 
a van Hove singularity. Through compression of the lattice by ~1%, we 
are able to tune through this van Hove singularity. Doing so strengthens 
the superconductivity dramatically. I also present results on Sr3Ru2O7, 
a material with a novel quantum critical phase that has long been 
thought, through the effects of electronic correlations alone, to have 
lower symmetry than the lattice. We find that this phase responds 
strongly to strain-tuning, but the evidence is that it has the C4 
symmetry of the lattice, albeit with a high susceptibility to 
anisotropic fields.

This study is very relevant to analysis of other compounds, including 
cuprate and iron pnictide superconductors, where C4 to C2 symmetry 
reduction plays a strong role."

Nadam se da ćete se odazvati u velikom broju,
                                                          Mihael Grbić



-- 

asst. prof. Mihael S. GRBIC
email: mgrbic at phy.hr
web: www.phy.hr/~mgrbic

contact:
office: + 385 1 460 5543
laboratory: +385 1 460 5503
fax: +385 1 468 0336

University of Zagreb
Faculty of Science
Department of Physics
Bijenicka cesta 32
10000 Zagreb
Croatia

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