解开高温超导体的神秘之处

A Binghamton University physicist¹ and his colleagues say they have unlocked one key mystery surrounding high-temperature superconductivity. Their research, published this week in the Proceedings² of the National Academy of Sciences, found a remarkable³ phenomenon in copper⁴-oxide⁵ (cuprate铜酸盐) high-temperature superconductors. Michael Lawler, assistant professor of physics at Binghamton, is part of an international team of physicists⁶ with an ongoing⁷ interest in the mysterious pseudogap（赝能隙） phase, the phase situated⁸ between insulating and superconducting phases in the cuprate phase diagram.   "Evidence has been accumulating that this phase supports an exotic density⁹ wave state that may be key to its existence," the physicists write in the new journal article. A density wave forms in a metal if the fluid electrons themselves crystalize.   Using a scanning tunneling microscope (STM) to visualize¹⁰ the electronic structure of the oxygen sites within a superconductor, the team found a density wave with a d-orbital structure. (The electron density near each copper atom looks a bit like a daisy in the crystallized pattern.) That's especially surprising because most density waves have an s-orbital structure; their electron density is isotropic. "It's not the pattern you would expect," Lawler says.   In this research, Lawler and his colleagues focused on a member of the cuprate class of superconductors called bismuth strontium calcium¹¹ copper oxide (BSCCO). "We now believe these density waves exist in all cuprates," says Lawler, a theorist whose contribution to the research involved subtle uses of the Fourier transform, a mathematical analysis that's useful when examining amplitude¹² patterns in waves.   Superconductors conduct electricity without resistance below a certain temperature. For decades, it was thought that these materials could conduct electricity only at temperatures far below freezing. Since 1987, however, scientists have discovered several compounds that superconduct at much higher temperatures.   Development of this technology could lead to near lossless delivery of electricity to homes and businesses as well as to improvements in cell phone tower receptions and even high-speed trains.