Signs of Broken Symmetry (IMAGE)
Caption
Top: Ripples extending down the chain of atoms breaks translational symmetry (like a checkerboard with black and white squares), which would cause extra spots in the diffraction pattern (shown as red dots in the underlying diffraction pattern). Bottom: Stretching along one direction breaks rotational symmetry but not translational symmetry (like a checkerboard with identical squares but stretched in one of the directions), causing no additional diffraction spots. The experiments proved that a new family of superconductors has the second type of electron density distribution, called a nematic.
Credit
Ben Frandsen
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