Heating-free Interlayer Tunneling Spectroscopy in Bi_(2)Sr_(2)CaCu_(2)O_(8+x) Intrinsic Junctions

摘要

The interlayer tunneling spectroscopy (ITS) in Bi_(2)Sr_(2)CaCu_(2)O_(8+x) (Bi-2212) intrinsic junctions (IJs) reveals the quasiparticle excitation spectrum in the material. In this study, using a proportional-integral-derivative (PID) temperature control scheme incorporated with the in-situ temperature measurements of stacks of IJs under study, we eliminate the artifact in the ITS, which is often caused by the self-heating in the high-bias region. Thus-measured spectral weight distribution with the clear peak-dip-hump structure exhibits subtle differences from that obtained without the PID control, which may provide in the long run a crucial guidance to understanding the mechanism of high-T_(c) superconductivity.