Quantum magnetism and frustrated magnets

In the following we present selected examples of recent research in the fields of quantum magnetism and frustrated magnets

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Bethe strings

In the ground state the magnetic moments are either upward or downward, the spins antiparallel to the external magnetic field (red) are never together (right). By excitation, further spins can align antiparallel and Bethe chains are formed (white spins, left). © HZB

Neutron scattering pattern of Nd2Zr2O7

Forced spin arrangement in (110) field

Forced spin arrangement in (110) field


Background-subtracted inelastic neutron scattering data along (6,0,l) for BaCu2V2O8.


Snapshot of the fluctuating ground state spin arrangement for one bi-triangle. © Macmillan Publishers Ltd.



Crystal and magnetic structure (one twin) of BaNi2V2O8 within a honeycomb plane


 ‘All-in/all-out’ magnetic structure of Nd2Zr2O7

Magnetic excitations of spinon pairs with total pseudospin S=1 corresponding to an odd number of pseudospin-1/2 flips.


Temperature versus magnetic field phase diagram of
Sr3Cr2O8. © APS


Inelastic neutron-scattering response, a color-coded map of the intensity, energy transfer (E) vs momentum transfer (Q) for Pr2Hf2O7 measured at 10 K with the incident energy Ei=136 meV. The arrows mark the position of CEF excitations in Pr2Hf2O7. © APS

Measured (a) and simulated (b) magnetic excitation
spectra perpendicular to the chain axis at 3 K © APS