Publication

Spin excitations near the pressure-induced antiferromagnetic transition in SrCu2(BO3)2

2026

Abstract

SrCu2(BO3)2 is a frustrated quantum magnet which realizes the Shastry–Sutherland model. The system exhibits a sequence of pressure-induced phases, including a long-range antiferromagnetically ordered state. We have performed inelastic neutron scattering experiments on a single crystal at 4.2 (2) GPa, in the antiferromagnetic phase. The observed dispersive spin excitations were modeled using linear-spin-wave theory to extract exchange parameters. Our results are consistent with previously reported parameters at higher pressures and confirm the existence of a Goldstone mode as well as underlining the importance of the interlayer coupling. These results complement previous high-pressure studies and provide further input for theoretical models of SrCu2(BO3)2 under extreme conditions.

Official source

https://infoscience.epfl.ch/entities/publication/1aa7d5d6-4fdd-4392-a3d7-52f0ee8a1772

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1aa7d5d6-4fdd-4392-a3d7-52f0ee8a1772

About this result

Related concepts (32)

Spin wave

In condensed matter physics, a spin wave is a propagating disturbance in the ordering of a magnetic material. These low-lying collective excitations occur in magnetic lattices with continuous symmetry. From the equivalent quasiparticle point of view, spin waves are known as magnons, which are bosonic modes of the spin lattice that correspond roughly to the phonon excitations of the nuclear lattice. As temperature is increased, the thermal excitation of spin waves reduces a ferromagnet's spontaneous magnetization.

Quantum spin liquid

In condensed matter physics, a quantum spin liquid is a phase of matter that can be formed by interacting quantum spins in certain magnetic materials. Quantum spin liquids (QSL) are generally characterized by their long-range quantum entanglement, fractionalized excitations, and absence of ordinary magnetic order. The quantum spin liquid state was first proposed by physicist Phil Anderson in 1973 as the ground state for a system of spins on a triangular lattice that interact antiferromagnetically with their nearest neighbors, i.

Geometrical frustration

In condensed matter physics, the term geometrical frustration (or in short: frustration) refers to a phenomenon where atoms tend to stick to non-trivial positions or where, on a regular crystal lattice, conflicting inter-atomic forces (each one favoring rather simple, but different structures) lead to quite complex structures. As a consequence of the frustration in the geometry or in the forces, a plenitude of distinct ground states may result at zero temperature, and usual thermal ordering may be suppressed at higher temperatures.

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Spin excitations near the pressure-induced antiferromagnetic transition in SrCu2(BO3)2

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