Speaker
Dr
Martin Mansson
(Laboratory for Solid State Physics, ETH Zurich)
Description
For many years the interest for transition metal oxides (TMO) has been dominated by the layered copper (3d) oxides e.g. high-temperature superconductors. With developments in sample growing technique, scientists have started to move down the periodic table. Our work focuses on the related 5d TMO, Sr2IrO4, which is expected to display a spin-1/2 Kramers doublet ground state. However, while Sr2RuO4 shows the expected metallic behaviour, Sr2IrO4 display an energy-gap at the Fermi level. Of many suggestions for the origin of this gap, only two possible suggestions remains: (1) A spin-density wave (SDW) order, or (2) A relativistic spin-orbital (SO) coupling, as recently proposed by ARPES measurements and LDA calculations. Here, we have used the power of muSR to investigate the possible presence of static magnetic order in this compound. From ZF measurements we find a long-range magnet order below Tc=240 K. Consequently, the energy-gap could most likely be deduced to the presence of magnetic ordering e.g. SDW. This also fits fits well into a recent suggestion that Sr2IrO4 could display high-temperature superconductivity upon electron doping.
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Poster
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Multiple order parameter systems
Primary author
Dr
Martin Mansson
(Laboratory for Solid State Physics, ETH Zurich)
Co-authors
Dr
Alex Amato
(LMU, PSI, Switzerland)
Dr
Daniel Andreica
(Babes-Bolyai University, Romania)
Dr
Hiroshi Nozaki
(Toyota Central Research and Development Labs., Japan)
Prof.
Ichiro Terasaki
(Department of Physics, Nagoya University, Japan)
Dr
Jun Sugiyama
(Toyota Central Research and Development Labs., Japan)
Dr
Kazuya Kamazawa
(Toyota Central Research and Development Labs., Japan)
Dr
Yannick Klein
(IMPMC, Paris, France)
Dr
Yutaka Ikedo
(Toyota Central Research and Development Labs., Japan)
