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首页> 外文期刊>Nature >A distinct bosonic mode in an electron-doped high-transition-temperature superconductor
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A distinct bosonic mode in an electron-doped high-transition-temperature superconductor

机译：电子掺杂的高转变温度超导体中的独特的玻色子模式

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Despite recent advances in understanding high-transition-temperature (high-T_c) superconductors, there is no consensus on the origin of the superconducting 'glue': that is, the mediator that binds electrons into superconducting pairs. The main contenders are lattice vibrations (phonons) and spin-excitations, with the additional possibility of pairing without mediators. In conventional superconductors, phonon-mediated pairing was unequivocally established by data from tunnelling experiments. Proponents of phonons as the high- T_c glue were therefore encouraged by the recent scanning tunnelling microscopy experiments on hole-doped Bi_2Sr_2CaCu_2O_(8-δ) (BSCCO) that reveal an oxygen lattice vibrational mode whose energy is anticorrelated with the superconducting gap energy scale. Here we report high-resolution scanning tunnelling microscopy measurements of the electron-doped high-T_c superconductor Pr_(0.88)LaCe_(0.12)CuO_4 (PLCCO) (T_c = 24 K) that reveal a bosonic excitation (mode) at energies of. 10.5 ± 2.5 meV. This energy is consistent with both spin-excitations in PLCCO measured by inelastic neutron scattering (resonance mode) and a low-energy acoustic phonon mode, but differs substantially from the oxygen vibrational mode identified in BSCCO. Our analysis of the variation of the local mode energy and intensity with the local gap energy scale indicates an electronic origin of the mode consistent with spin-excitations rather than phonons.
机译：尽管最近在理解高转变温度（high-T_c）超导体方面取得了进步，但对于超导“胶水”的起源尚无共识：即，将电子束缚成超导对的介体。主要竞争者是晶格振动（声子）和自旋激发，并且在没有介体的情况下也可能配对。在常规的超导体中，声子介导的配对是通过隧道实验的数据明确建立的。因此，最近在空穴掺杂的Bi_2Sr_2CaCu_2O_（8-δ）（BSCCO）上进行的扫描隧道显微镜实验激发了声子作为高T_c胶的支持者，该实验揭示了氧晶格振动模式，其能量与超导间隙能级反相关。在这里，我们报告了电子掺杂的高T_c超导体Pr_（0.88）LaCe_（0.12）CuO_4（PLCCO）（T_c = 24 K）的高分辨率扫描隧道显微镜测量结果，该结果揭示了能量为时的玻色子激发（模式）。 10.5±2.5兆电子伏。此能量与通过非弹性中子散射（共振模式）和低能量声子声子模式测得的PLCCO中的自旋激发一致，但与BSCCO中确定的氧振动模式大不相同。我们对局部模式能量和强度随局部间隙能级变化的分析表明，该模式的电子起源与自旋激发而不是声子一致。

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