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Magnetic frustration and spontaneous rotational symmetry breaking in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">PdCrO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
In the delafossite lattice structure of the triangular antiferromagnet PdCrO${}_{2}$, the interlayer stacking means that the net interlayer exchange interaction is zero. Through neutron scattering measurements under uniaxial stress, the authors show here that magnetism relieves this frustration through a spontaneous tilt of the spins that breaks the threefold rotational …