Odd and even magnetic resonant modes in highly overdoped Bi2Sr2CaCu2O8+δ
Odd and even magnetic resonant modes in highly overdoped Bi2Sr2CaCu2O8+δ
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DOI：
10.1103/physrevb.75.060502
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发表时间：
2007-02-01
影响因子：
3.7
通讯作者：
Keimer, B.
中科院分区：
文献类型：
--
作者：
Capogna, L.;Fauque, B.;Keimer, B.
本文给出了超导转变温度T-C=70 K的高过掺杂Bi_2Sr_2CaCu_2O_（8+）δ单晶的非弹性中子散射数据，并与T-C=87 K的近最佳掺杂晶体进行了比较。在这两个样品中，观察到的磁共振模式与奇，偶对称下交换的两个氧化铜层的单位电池。在过掺杂样品中，奇模的线宽与最佳掺杂样品相比减小。这一发现进行了讨论，结合最近的证据，在这种化合物的内在不均匀性。奇数和偶数共振激发的数据是完全一致的趋势，建立在YBa 2Cu 3 O 6 +x的数据的基础上。这证实了这些发现的普遍性，并将其扩展到高度过掺杂的相图制度。
We present inelastic neutron scattering data on highly overdoped Bi2Sr2CaCu2O8+delta single crystals with superconducting transition temperature T-C=70 K and, for comparison, a nearly optimally doped crystal with T-C=87 K. In both samples, magnetic resonant modes with odd and even symmetry under exchange of the two CuO2 layers in the unit cell are observed. In the overdoped sample, the linewidth of the odd mode is reduced compared with the optimally doped sample. This finding is discussed in conjunction with recent evidence for intrinsic inhomogeneities in this compound. The data on odd and even resonant excitations are otherwise fully consistent with trends established on the basis of data on YBa2Cu3O6+x. This confirms the universality of these findings and extends them into the highly overdoped regime of the phase diagram.