Enhanced spin-phonon-electronic coupling in a 5d oxide

S. Calder (), J. H. Lee (), M. B. Stone, M. D. Lumsden, J. C. Lang, M. Feygenson, Z. Zhao, J.-Q. Yan, Y. G. Shi, Y. S. Sun, Y. Tsujimoto, K. Yamaura and A. D. Christianson
Additional contact information
S. Calder: Oak Ridge National Laboratory
J. H. Lee: Oak Ridge National Laboratory
M. B. Stone: Oak Ridge National Laboratory
M. D. Lumsden: Oak Ridge National Laboratory
J. C. Lang: Advanced Photon Source, Argonne National Laboratory
M. Feygenson: Oak Ridge National Laboratory
Z. Zhao: Oak Ridge National Laboratory
J.-Q. Yan: Oak Ridge National Laboratory
Y. G. Shi: Institute of Physics, Chinese Academy of Sciences
Y. S. Sun: Superconducting Properties Unit, National Institute for Materials Science
Y. Tsujimoto: Materials Processing Unit, National Institute for Materials Science
K. Yamaura: Superconducting Properties Unit, National Institute for Materials Science
A. D. Christianson: Oak Ridge National Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Enhanced coupling of material properties offers new fundamental insights and routes to multifunctional devices. In this context 5d oxides provide new paradigms of cooperative interactions that drive novel emergent behaviour. This is exemplified in osmates that host metal–insulator transitions where magnetic order appears intimately entwined. Here we consider such a material, the 5d perovskite NaOsO3, and observe a coupling between spin and phonon manifested in a frequency shift of 40 cm−1, the largest measured in any material. The anomalous modes are shown to involve solely Os–O interactions and magnetism is revealed as the driving microscopic mechanism for the phonon renormalization. The magnitude of the coupling in NaOsO3 is primarily due to a property common to all 5d materials: the large spatial extent of the ion. This allows magnetism to couple to phonons on an unprecedented scale and in general offers multiple new routes to enhanced coupled phenomena in 5d materials.

Date: 2015
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DOI: 10.1038/ncomms9916

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