Measurement Of Spin Dynamics In A Layered Nickelate Using X-Ray Photon Correlation Spectroscopy: Evidence For Intrinsic Destabilization Of Incommensurate Stripes At Low Temperatures
PHYSICAL REVIEW LETTERS(2021)
摘要
We study the temporal stability of stripe-type spin order in a layered nickelate with x-ray photon correlation spectroscopy and observe fluctuations on timescales of tens of minutes over a wide temperature range. These fluctuations show an anomalous temperature dependence: they slow down at intermediate temperatures and speed up on both heating and cooling. This behavior appears to be directly connected with spatial correlations: stripes fluctuate slowly when stripe correlation lengths are large and become faster when spatial correlations decrease. A low-temperature decay of nickelate stripe correlations, reminiscent of what occurs in cuprates as a result of a competition between stripes and superconductivity, hence occurs via loss of both spatial and temporal correlations.
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关键词
layered nickelate,spin dynamics,spectroscopy,x-ray
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