Neutron Scattering and Magnetism
Laboratory for Solid State Physics · ETH Zurich

News

Jul 15, 2026 · New preprint: Transverse order and longitudinal fluctuations in a near-Ising spin supersolid — neutron scattering inside the supersolid phases of K2Co(SeO3)2. arXiv:2607.13635.

May 29, 2026 · Magnetic phase diagram and spin Hamiltonian of antiferromagnet Cs2CoI4 is published in Phys. Rev. Materials 10, 054420; also on arXiv:2603.08237.

May 26, 2026 · Z2 vortex crystal candidate in the triangular quantum antiferromagnet is published in npj Quantum Materials; also on arXiv:2512.01793.

May 22, 2026 · New preprint: Field evolution of the magnetic structure and spin Hamiltonian in Cs2RuO4. arXiv:2605.23363.

May 16, 2026 · Nonperturbative semiclassical spin dynamics for ordered quantum magnets is published in npj Quantum Materials; also on arXiv:2508.21142.

May 11, 2026 · Dynamics and thermodynamics of the S = 5/2 almost-Heisenberg triangular lattice antiferromagnet K2Mn(SeO3)2 is published in Phys. Rev. B 113, 184436; also on arXiv:2602.11983.

This is the home of Prof. Dr. Andrey Zheludev's Neutron Scattering and Magnetism group in the Laboratory for Solid State Physics at ETH Zürich.

We study magnetism in the regime where quantum mechanics takes over. In certain crystalline insulators, interacting electron spins never settle into the neat static patterns of classical magnetism. Instead, they form collective quantum states with no classical analog whatsoever: spin liquids, spin nematics, Bose-Einstein condensates of magnons and magnon "molecules", quantum-critical matter. Each such material is a many-body quantum problem in "flesh and blood": we can hold it in hand, cool it down, and interrogate it experimentally. How does magnetic order emerge, and how does it die? What happens to a quantum magnet at a phase transition, under extreme pressure, or when we deliberately contaminate it with disorder? These are the questions that drive our research.

Everything starts at the ETH Hönggerberg campus. We grow our own single crystals and then squeeze every bit of information out of them with in-house techniques: magnetometry, calorimetry and electrometry at temperatures within a few hundredths of a degree of absolute zero and in magnetic fields up to 14 T, optical spectroscopy, and high pressure experiments in diamond anvil cells. The culmination of most projects is neutron scattering, without doubt the most powerful probe of magnetism on atomic scales. It is the only method that maps out the full wave-vector and energy dependence of spin correlations, and we use it at the best neutron sources around the globe.