Spin pseudogap in La2-xSrxCuO4 studied by neutron scattering
Spin pseudogap in La2-xSrxCuO4 studied by neutron scattering
复制标题
通过中子散射研究 La2-xSrxCuO4 中的自旋赝能隙
DOI：
10.1103/physrevb.67.134521
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发表时间：
2002
影响因子：
3.7
通讯作者：
Y. Endoh
中科院分区：
文献类型：
--
作者：
Chun;K. Yamada;H. Hiraka;C. Rao;Y. Endoh
利用非弹性中子散射技术研究了la2 - x Sr x cuo4在2 meV≤ω≤12 meV能量范围和8 K≤T≤150 K温度范围内的自旋激发。在x = 0.18时，我们观察到在T c以上的激发谱中有自旋赝隙的特征。加热后，自旋赝隙在T = 80 ~ 150k之间逐渐坍缩。对于x = 0.15和0.20样品，虽然在T ~ T c处的类隙结构的可见性比x = 0.18样品低，但在ω ~ 5 meV处出现了Χ”（ω）的宽隆起，接近基温下的自旋间隙能，表明在正常状态下存在自旋赝隙。
Spin excitations of La 2 - x Sr x CuO 4 have been studied using inelastic neutron scattering techniques in the energy range of 2 meV≤ω≤12 meV and the temperature range of 8 K≤T≤150 K. We observed a signature of a spin pseudogap in the excitation spectrum above T c for the slightly overdoped sample with x = 0.18. On heating, the spin pseudogap gradually collapses between T = 80 and 150 K. For the x = 0.15 and 0.20, although the visibility of gaplike structure at T∼T c is lower compared to the x = 0.18 sample, the broad bump of Χ"(ω) appears at ω ∼5 meV, close to the spin-gap energy at base temperature, suggests the existence of the spin pseudogap in the normal state.