Scientific project


HrZZ - UIP-2014-09-9775


Influence of Magnetic Anisotropy on Quantum Spin Systems

project leader

Mirta Herak

associatesIvana Levatić
Martina Dragičević
Nikolina Novosel
Dijana Žilić (IRB)
Zoran Džolić (IRB)
web page
start date01.06.2015.
end date15.09.2018.
total ammount750.000,00 kn
research areasSolid state physics



herak-project-webStudy of magnetic materials provides us with understanding of a broad spectrum of physical phenomena and continues to enable the development of important new technologies. Magnetism is a quantum phenomenon emerging from the superexchange interactions between magnetic moments in the material. Understanding how these interactions bring forth a material with specific magnetic properties is one of the key questions in materials science. In low-dimensional quantsum spin systems the interactions between the spins are described by the isotropic Heisenberg Hamiltonian formalism. However, the importance of weak anisotropic interactions emerges from experiments and requires new theoretical treatments. These interactions are found to induce new interesting phenomena, many of which have great potential for applications in emerging technologies. Exploiting new methods and experiments sensitive to these interactions is thus crucial.

Aim of this project is to experimentally investigate the influence of magnetic anisotropy on quasi-low-dimensional quantum spin systems by combining two highly sensitive techniques: torque magnetometry and electron spin resonance (ESR) spectroscopy. Our investigation is focused on the samples in which magnetism comes from electron spin S=1/2 and which can be classified as quasi low-dimensional spin S=1/2 Heisenberg antiferromagnets. We will study the influence of weak anisotropic interactions on the ground states and low energy excitations of these systems. The combination of mentioned experimental techniques allows a new methodology for investigation of the influence of magnetic anisotropy on quantum spin systems and other magnetic materials. The results will provide important experimental input in understanding of anisotropy induced phenomena in magnetic materials.



Mirta Herak, Nikolina Novosel, Martina Dragičević, Thierry Guizouarn, Olivier Cador, Helmuth Berger, Matej Pregelj, Andrej Zorko, and Denis ArčonMagnetic-field-induced reorientation in the spin-density-wave and the spin-stripe phases of the frustrated spin-1/2 chain compound β-TeVO4
Physical Review B 102, 024422 (2020)
DOI: 10.1103/PhysRevB.102.024422 20200715


Nikolina Novosel, William Lafargue-Dit-Hauret, Željko Rapljenović, Martina Dragičević, Helmuth Berger, Dominik Cinčić, Xavier Rocquefelte, and Mirta HerakStrong decoupling between magnetic subsystems in the low-dimensional spin-1/2 antiferromagnet SeCuO3
Physical Review B 99, 014434 (2019)
DOI: 10.1103/PhysRevB.99.014434 20190128


D. Žilić, D. Maity, M. Cetina, K. Molčanov, Z. Džolić, and M. HerakMagnetostructural Characterization of Oxalamide DihaloBridged Copper Dimers: Intra- and Interdimer Interactions Studied by Single-Crystal Electron Spin Resonance Spectroscopy
ChemPhysChem 18, 2397- 2408 (2017)
DOI: 10.1002/cphc.201700433 20170801


A. Zorko, M. Herak, M. Gomilšek, J. van Tol, M. Velázquez, P. Khuntia, F. Bert, and P. MendelsSymmetry Reduction in the Quantum Kagome Antiferromagnet Herbertsmithite
Physical Review Letters 118, 017202 (2017)
DOI: 10.1103/PhysRevLett.118.017202 20170105Download publication


M. Pregelj, O. Zaharko, M. Herak, M. Gomilšek, A. Zorko, L. C. Chapon, F. Bourdarot, H. Berger and D. ArčonExchange anisotropy as mechanism for spin-stripe formation in frustrated spin chains
Physical Review B (Rapid Communications), 94, 081114(R) (2016)
DOI: 10.1103/PhysRevB.94.081114 20160829

IF Ⓒ 2017