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Magnetic excitation spectrum of LuFe2O4 measured with inelastic neutron scattering

Physical Review B American Physical Society (APS) 91:3 (2015) 035103

Authors:

SM Gaw, HJ Lewtas, DF McMorrow, J Kulda, RA Ewings, TG Perring, RA McKinnon, G Balakrishnan, D Prabhakaran, AT Boothroyd
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Raw data for Pb2CoOsO6

University of Oxford (2015)

Authors:

Andrew Boothroyd, Andrew Princep, Masahiro Nagao, Yoshitaka Matsushita, Kazunari Yamaura, Hai L Feng, Yanfeng Guo, Hongming Weng, Pascal Manuel, Dmitry Khalyavin, Anatoliy Senyshyn, Marein Rahn, Yahua Yuan

Abstract:

The data are from an investigation carried out between 2013 and 2015 on a newly synthesized compound Pb2CoOsO6. The archive contains raw data from experimental measurements and electronic structure calculations. The data are provided in text files combined into a zip archive.
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Crystallography and physics

Physica Scripta IOP Publishing 89:12 (2014) 128003
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Laser-induced charge-disproportionated metallic state in LaCoO3

Physical Review B American Physical Society (APS) 90:23 (2014) 235128

Authors:

M Izquierdo, M Karolak, C Trabant, K Holldack, A Föhlisch, K Kummer, D Prabhakaran, AT Boothroyd, M Spiwek, A Belozerov, A Poteryaev, A Lichtenstein, SL Molodtsov
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Mechanism of spin crossover in LaCoO3 resolved by shape magnetostriction in pulsed magnetic fields

Scientific Reports Springer Nature 4 (2014) 7003

Authors:

M Rotter, Z-S Wang, Andrew Boothroyd, D Prabhakaran, A Tanaka, M Doerr

Abstract:

In the scientific description of unconventional transport properties of oxides (spin-dependent transport, superconductivity etc.), the spin-state degree of freedom plays a fundamental role. Because of this, temperature- or magnetic field-induced spin-state transitions are in the focus of solid-state physics. Cobaltites, e.g. LaCoO3, are prominent examples showing these spin transitions. However, the microscopic nature of the spontaneous spin crossover in LaCoO3 is still controversial. Here we report magnetostriction measurements on LaCoO3 in magnetic fields up to 70 T to study the sharp, field-induced transition at Hc ≈ 60 T. Measurements of both longitudinal and transversal magnetostriction allow us to separate magnetovolume and magnetodistortive changes. We find a large increase in volume, but only a very small increase in tetragonal distortion at Hc. The results, supported by electronic energy calculations by the configuration interaction cluster method, provide compelling evidence that above Hc LaCoO3 adopts a correlated low spin/high spin state.
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