Dimensional reduction by pressure in the magnetic framework material CuF2(D2O)2pyz: From spin-wave to spinon excitations

Skoulatos, M.; Månsson, M.; Fiolka, Christoph; Krämer, Karl; Schefer, J.; White, J.S.; Rüegg, Ch. (2017). Dimensional reduction by pressure in the magnetic framework material CuF2(D2O)2pyz: From spin-wave to spinon excitations. Physical review. B - condensed matter and materials physics, 96(2) American Physical Society 10.1103/PhysRevB.96.020414

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Metal organic magnets have enormous potential to host a variety of electronic and magnetic phases that originate from a strong interplay between the spin, orbital, and lattice degrees of freedom. We control this interplay in the quantum magnet CuF2(D2O)2(pyz) by using high pressure to drive the system through structural and magnetic phase transitions. Using neutron scattering, we show that the low pressure state, which hosts a two-dimensional square lattice with spin-wave excitations and a dominant exchange coupling of 0.89 meV, transforms at high pressure into a one-dimensional spin chain hallmarked by a spinon continuum and a reduced exchange interaction of 0.43 meV. This direct microscopic observation of a magnetic dimensional crossover as a function of pressure opens up new possibilities for studying the evolution of fractionalised excitations in low-dimensional quantum magnets and eventually pressure-controlled metal–insulator transitions.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Fiolka, Christoph and Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

1098-0121

Publisher:

American Physical Society

Funders:

[42] Schweizerischer Nationalfonds
[103] European Commission FP7
[UNSPECIFIED] DFG

Language:

English

Submitter:

Karl Krämer

Date Deposited:

29 Nov 2017 12:28

Last Modified:

28 Oct 2019 23:44

Publisher DOI:

10.1103/PhysRevB.96.020414

ArXiv ID:

1708.03586v1

BORIS DOI:

10.7892/boris.107314

URI:

https://boris.unibe.ch/id/eprint/107314

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