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Freezing of a Stripe Liquid

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arxiv cond-mat/0110191 v2 pith:Y6PTNCLA submitted 2001-10-09 cond-mat.str-el

S.-H. Lee , J. M. Tranquada , K. Yamada , D. J. Buttrey , Q. Li , S.-W. Cheong This is my paper
classification cond-mat.str-el
keywords energymagneticscatteringabruptalthoughantiferromagneticchargecharge-ordering
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The existence of a stripe-liquid phase in a layered nickelate, La(1.725)Sr(0.275)NiO(4), is demonstrated through neutron scattering measurements. We show that incommensurate magnetic fluctuations evolve continuously through the charge-ordering temperature, although an abrupt decrease in the effective damping energy is observed on cooling through the transition. The energy and momentum dependence of the magnetic scattering are parametrized with a damped-harmonic-oscillator model describing overdamped spin-waves in the antiferromagnetic domains defined instantaneously by charge stripes.

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