Sign switching of dimer correlations in SrCu2(BO3)2 under hydrostatic pressure
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Date
2020
Publication Type
Journal Article
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Abstract
Magnetic and vibrational excitations in SrCu2(BO3)2 are studied using Raman spectroscopy at hydrostatic pressures up to 34 kbar and temperatures down to 2.6 K. The frequency of a particular optical phonon, the so-called pantograph mode, shows a very strong anomalous temperature dependence below about 40 K. We link the magnitude of the effect to the magnetic exchange energy on the dimer bonds in the Sutherland-Shastry spin lattice in this material. The corresponding dimer spin correlations are quantitatively estimated and found to be strongly pressure dependent. At around P2∼22 kbar they switch from antiferromagnetic to being predominantly ferromagnetic.
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published
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2 (1)
Pages / Article No.
12010
Publisher
American Physical Society
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03855 - Zheludev, Andrey / Zheludev, Andrey
03855 - Zheludev, Andrey / Zheludev, Andrey