[seminar] Izvanredan znanstveni seminar Hrvatskog fizikalnog drustva: petak, 16.10., 14:00 sati, F-102 (FO)
Mihael S. Grbić
mgrbic at phy.hr
Mon Oct 12 10:19:01 CEST 2015
Poštovani kolege,
*u petak 16.10.*, 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 će biti *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."
--
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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