Giant phonon softening in the pseudogap phase of the quantum spin system<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">TiOCl</mml:mi></mml:mrow></mml:math>

P. Lemmens, F. C. Chou, G. Caimi et al.|Physical Review B|2004

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