Unknown

Dataset Information

0

Emergence of long-range order in sheets of magnetic dimers.


ABSTRACT: Quantum spins placed on the corners of a square lattice can dimerize and form singlets, which then can be transformed into a magnetic state as the interactions between dimers increase beyond threshold. This is a strictly 2D transition in theory, but real-world materials often need the third dimension to stabilize long-range order. We use high pressures to convert sheets of Cu(2+) spin 1/2 dimers from local singlets to global antiferromagnet in the model system SrCu2(BO3)2. Single-crystal neutron diffraction measurements at pressures above 5 GPa provide a direct signature of the antiferromagnetic ordered state, whereas high-resolution neutron powder and X-ray diffraction at commensurate pressures reveal a tilting of the Cu spins out of the plane with a critical exponent characteristic of 3D transitions. The addition of anisotropic, interplane, spin-orbit terms in the venerable Shastry-Sutherland Hamiltonian accounts for the influence of the third dimension.

SUBMITTER: Haravifard S 

PROVIDER: S-EPMC4209985 | biostudies-literature |

REPOSITORIES: biostudies-literature

Similar Datasets

| S-EPMC8640986 | biostudies-literature
| S-EPMC5544711 | biostudies-other
| S-EPMC4728556 | biostudies-other
| S-EPMC3642045 | biostudies-literature
| S-EPMC6599026 | biostudies-literature
| S-EPMC5118796 | biostudies-literature
| S-EPMC16503 | biostudies-literature
| S-EPMC5576822 | biostudies-literature
| S-EPMC5458152 | biostudies-literature
| S-EPMC6641010 | biostudies-literature