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arXiv 0808.3750cond-mat.supr-concond-mat.str-el
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La2-xSrxCuO4赝隙相中相干磁激发的出现

The emergence of coherent magnetic excitations in the pseudogap phase of La2-xSrxCuO4

O. J. Lipscombe, B. Vignolle, T. G. Perring, C. D. Frost, S. M. Hayden

摘要:

我们用非弹性中子散射测量了欠掺杂超导体La_(2-x)Sr_xCuO_4(x=0.085,Tc=22 K)在能量和温度分别为5 < E < 200 meV和5 < T < 300 K范围内的磁激发。在高温下(T = 300 K),我们观察到强阻尼激发的特征能量约为50毫电子伏。随着温度降低到T = 30 K,我们进入赝能隙态,磁激发在能量和动量低于约60 meV时变得高度结构化。这种变化似乎与电子激发中的赝能隙的发展有关。

英文摘要:

We use inelastic neutron scattering to measure the magnetic excitations in the underdoped superconductor La2-xSrxCuO4 (x=0.085, Tc=22 K) over energy and temperatures ranges 5 < E < 200 meV and 5 < T < 300 K respectively. At high temperature (T = 300 K), we observe strongly damped excitations with a characteristic energy scale of approximately 50 meV. As the temperature is lowered to T = 30 K, and we move into the pseudogap state, the magnetic excitations become highly structured in energy and momentum below about 60 meV. This change appears to be associated with the development of the pseudogap in the electronic excitations.

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