Magnetic ground state of the breathing pyrochlore Ba3Yb2Zn5O11

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"Breathing pyrochlores" are a new class of material that contain sublattices of corner sharing tetrahedra, where the the sizes of the tetrahedra differ on the different sublattices. The recently synthesised Ba3Yb2Zn5O11 has been reported to be such a geometrically frustrated pyrochlore, in which the Yb ions adopt a pseudo-spin-1/2 ground state. The measured negative Curie-Weiss temperature indicates significant antiferromagnetic exchange couplings. However, no long range order has been observed to sub-Kelvin temperatures, and a proposed...
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