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Metal organic magnets have enormous potential to host a variety of electronicand magnetic phases that originate from a strong interplay between the spin,orbital and lattice degrees of freedom. We control this interplay in thequantum magnet CuF$_2$(D$_2$O)$_2$pyz by using high pressure to drive thesystem through a structural and magnetic phase transition. Using neutronscattering, we show that the low pressure state, which hosts a two-dimensionalsquare lattice with spin-wave excitations and a dominant exchange coupling of0.89 meV, transforms at high pressure into a one-dimensional spin-chainhallmarked by a spinon continuum and a reduced exchange interaction of 0.43meV. This direct microscopic observation of a magnetic dimensional crossover asa function of pressure opens up new possibilities for studying the evolution offractionalised excitations in low dimensional quantum magnets and eventuallypressure-controlled metal--insulator transitions.

Dimensional reduction by pressure in the magnetic framework material CuF$_{2}$(D$_{2}$O)$_{2}$pyz: from spin-wave to spinon excitations