Quantum Spin Liquids are candidates for potential use in future information technologies. So far, Quantum Spin Liquids have usually only been found in one or two dimensional magnetic systems only. Now an international team led by HZB scientists has investigated crystals of PbCuTe_{2}O_{6 }with neutron experiments at ISIS, NIST, and ILL.

They found spin liquid behavior in 3D, due to a so-called hyper hyperkagome lattice. The experimental data fit extremely well to theoretical simulations also done at HZB.

IT devices today are based on electronic processes in semiconductors. The next real breakthrough could be to exploit other quantum phenomena, for example interactions between tiny magnetic moments in the material, the so-called spins. So-called quantum-spin liquid materials could be candidates for such new technologies. They differ significantly from conventional magnetic materials because quantum fluctuations dominate the magnetic interactions: Due to geometric constraints in the crystal lattice, spins cannot all “freeze” together in a ground state – they are forced to fluctuate, even at temperatures close to absolute zero.

#### Quantum spin liquids: a rare phenomenon

Quantum spin liquids are rare and have so far been found mainly in two-dimensional magnetic systems. Three-dimensional isotropic spin liquids are mostly sought in materials where the magnetic ions form pyrochlore or hyperkagome lattices. An international team led by HZB physicist Prof. Bella Lake has now investigated samples of PbCuTe_{2}O_{6}, which has a three-dimensional lattice called hyper-hyperkagome lattice.

#### Magnetic interactions simulated

HZB physicist Prof. Johannes Reuther calculated the behavior of such a three-dimensional hyper-hyperkagome lattice with four magnetic interactions and showed that the system exhibits quantum-spin liquid behavior with a specific magnetic energy spectrum.

#### Experiments at neutron sources find 3D quantum spin liquid

With neutron experiments at ISIS, UK, ILL, France, NIST, USA the team was able to prove the very subtle signals of this predicted behavior. “We were surprised how well our data fit into the calculations. This gives us hope that we can really understand what happens in these systems,” explains first author Dr. Shravani Chillal, HZB.

Reference: “Evidence for a three-dimensional quantum spin liquid in PbCuTe_{2}O_{6}” by Shravani Chillal, Yasir Iqbal, Harald O. Jeschke, Jose A. Rodriguez-Rivera, Robert Bewley, Pascal Manuel, Dmitry Khalyavin, Paul Steffens, Ronny Thomale, A. T. M. Nazmul Islam, Johannes Reuther and Bella Lake, 11 May 2020, *Nature Communications*.

DOI: 10.1038/s41467-020-15594-1

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