Orbital ordering transition in La4Ru2O10

P. Khalifah, R. Osborn, Q. Huang, H. W. Zandbergen, R. Jin, Y. Liu, D. Mandrus, R. J. Cava

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Abstract

We report experimental evidence for a full orbital ordering transition in the two-dimensional lanthanum ruthenate La4Ru2O10. The observable consequences of this orbital ordering include the loss of the Ru local moment, a structural distortion which partitions Ru-O bonds into axially oriented short and long sets, a sharp jump in electrical resistivity, and the opening of a spin gap that is visible in neutron scattering experiments. This is a rare example of a discrete orbital ordering transition in a 4d transition metal oxide and demonstrates that orbital effects can have an influence on the properties of layered ruthenates, a family of compounds that notably includes the p-wave superconductor Sr2RuO4 and the field-tuned quantum critical metamagnet Sr3Ru2O7.

Original languageEnglish (US)
Pages (from-to)2237-2240
Number of pages4
JournalScience
Volume297
Issue number5590
DOIs
StatePublished - Sep 27 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

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    Khalifah, P., Osborn, R., Huang, Q., Zandbergen, H. W., Jin, R., Liu, Y., Mandrus, D., & Cava, R. J. (2002). Orbital ordering transition in La4Ru2O10. Science, 297(5590), 2237-2240. https://doi.org/10.1126/science.1075556