[seminar] (27.2.2018, 14:00, F08) Frustration in antiferromagnetic systems - laboratory for new states of matter

[Mihael Makek]

Poštovane kolegice i kolege,

pozivam Vas na seminar koji će održati prof. dr. Denis Arčon sa Instituta
Jožef Stefan i Sveučilišta u Ljubljani pod naslovom:

"Frustration in antiferromagnetic systems - laboratory for new states of
Matter"

Mjesto: Fizički odsjek, F-08 (velika predavaonica)
Vrijeme: utorak 27. veljače 2018, 14:00 (točno)

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Dear colleagues,

I would like to invite you to the seminar by Prof. Denis Arčon from the
Institut "Jožef Stefan" and Faculty of mathematics and physics, University
of Ljubljana, Slovenia

"Frustration in antiferromagnetic systems - laboratory for new states of
matter"

Location: Department of Physics, F-08 (large lecture hall)
Time: 14:00 (sharp) on Tuesday, February 27th, 2018


----SEMINAR ABSTRACT--------------------------------------------------

The field of quantum magnetism has proven to be a very rich playground to
uncover novel states of matter. Low dimensional antiferromagnets remain
model systems to stabilize ground states where quantum fluctuations
dominate the low-temperature physics. In conventional antiferromagnets,
magnetic moments align antiparallel with respect to the nearest neighbour
moments below a characteristic Neel temperature. However, in certain low
dimensional magnetic systems with geometrically frustrated lattice not all
interactions can be pairwise optimised. In such cases, the role of
geometrical frustration is typically manifested in a drastic suppression
of Neel temperature, in a state with a very complicated non-collinear
magnetic order or even in a complete suppression of long range magnetic
order and establishment of elusive quantum spin liquid. In this talk I
will demonstrate the crucial role of geometrical frustration on selected
examples: the beta-TeVO4 compound comprising frustrated chains [1,2] and
the layered 1T-TaS2 with a triangular lattice [3].

[1] M. Pregelj, A. Zorko, O. Zaharko, H. Nojiri, H. Berger, L.C. Chapon,
D. Arčon, Nat. Comm. 6, 7255 (2015).
[2] M. Pregelj et al., Phys. Rev. B 94, 081114(R) (2016).
[3] M. Klanjšek, A. Zorko, R. Žitko, J. Mravlje, Z. Jagličić, P. K.
Biswas, P. Prelovšek, D. Mihailović, D. Arčon, Nat. Phys. 13, 1130 (2017).
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Srdačno,
Mihael Makek