期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 40, 页码 14372-14377出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1413318111
关键词
condensed matter physics; quantum magnetism; phase transition; dimensional cross-over; neutron and X-ray scattering
资金
- National Science Foundation [DMR-1206519]
- US Department of Energy (DOE) Office of Basic Energy Sciences [DE-AC02-06CH11357]
- DOE Office of Basic Energy Sciences
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1206519] Funding Source: National Science Foundation
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 Cu2+ 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.
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