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Dimensional reduction by pressure in the magnetic framework material CuF2(D2O)(2)( pyz): From spin-wave to spinon excitations
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics. Paul Scherrer Institute, Switzerland; École Polytechnique Fédérale de Lausanne, Switzerland.
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2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 2, article id 020414Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 96, no 2, article id 020414
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Condensed Matter Physics
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URN: urn:nbn:se:kth:diva-215477DOI: 10.1103/PhysRevB.96.020414ISI: 000411600300001Scopus ID: 2-s2.0-85027374031OAI: oai:DiVA.org:kth-215477DiVA, id: diva2:1149202
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QC 20171013

Available from: 2017-10-13 Created: 2017-10-13 Last updated: 2017-11-29Bibliographically approved

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Månsson, Martin

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