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Spin-orbit effects in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Na</mml:mtext></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Ir</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math>: A hyper-kagome lattice antiferromagnet
We consider spin-orbit coupling effects in ${\text{Na}}_{4}{\text{Ir}}_{3}{\text{O}}_{8}$, a material in which ${\text{Ir}}^{4+}$ spins form an hyper-kagome lattice, a three-dimensional network of corner-sharing triangles. We argue that both low-temperature thermodynamic measurements and the impurity susceptibility induced by dilute substitution of Ti for Ir are suggestive of significant spin-orbit effects. Because of …