q dependence of self-energy effects of the plane oxygen vibration in YBa2Cu3O7.
q dependence of self-energy effects of the plane oxygen vibration in YBa2Cu3O7.
复制标题
DOI：
10.1103/physrevlett.75.2396
复制
发表时间：
1995-09
影响因子：
8.6
通讯作者：
Reznik;Keimer;Dogan;Aksay
中科院分区：
文献类型：
--
作者：
Reznik;Keimer;Dogan;Aksay
测量了孪生单晶YBa2Cu3O7中42.5 meV声子分支的峰位和线宽随波矢Q的温度关系。在布里渊区的s100dy010d方向上，在超导转变温度T_c以下的某些Q值发生了相当大的软化和展宽。我们在s110dy°110°方向上观察到Q的软化和线宽没有数量级的减小。讨论了这些发现对超导序参数对称性的可能影响。
We have measured the temperature dependence of the peak position and linewidth of the 42.5 meV phonon branch in a twinned single crystal of YBa 2Cu 3O 7 as a function of wave vector q. In the s100dys010d direction in the Brillouin zone, considerable softening and broadening occur below the superconducting transition temperature Tc at some values of q. We observe an order of magnitude smaller softening and no linewidth broadening for q in the s110dy ° 110 ¢ direction. Possible implications of these findings for the symmetry of the superconducting order parameter are discussed.