考研英语阅读篇章: 揭开高温超导体的神秘面纱

考研网

 新东方在线小编为大家整理考研英语阅读系列篇章精选，通过双语阅读的方式，帮助同学们捕捉国内外新闻以及最前沿的奇人异事。考生可作为备考资料，阅读的同时将不熟的单词牢记。
      考研英语阅读篇章：揭开高温超导体的神秘面纱
    A Binghamton University physicist and his colleagues say they have unlocked
one key mystery surrounding high-temperature superconductivity. Their research,
published this week in the Proceedings of the National Academy of Sciences,
found a remarkable phenomenon in copper-oxide (cuprate铜酸盐) high-temperature
superconductors. Michael Lawler, assistant professor of physics at Binghamton,
is part of an international team of physicists with an ongoing interest in the
mysterious pseudogap(赝能隙) phase, the phase situated between insulating and
superconducting phases in the cuprate phase diagram.
    "Evidence has been accumulating that this phase supports an exotic density
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 visualize 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 calcium 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
amplitude 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.
     以上是考研英语阅读篇章双语新闻系列分享，同学们在复习过程中找不到适合自己的方法可参考参考【2015暑期备考】专题，或选择>>点击查看资料下载中心。

【热点聚焦】	【考研关注】
2015年推荐免试攻读研究生流程图解	2015年考研志愿填报指南
2015年保研指南：需要提交的材料	2015年考研："高出身"的五大专业
2015年专科生考研条件	2015年医学生考研流程
研究生招生拟录取公示不少于10个工作日	2015年各高校硕士研究生招生简章
【复习备考】	【专题推荐】
2015年医学生考研科目	2015考研备考_时事政治
2015考研：考研英语每日复习时间表	2015年跨专业考研全方位指导
2015考研英语复习必备素材精选句	2015年考研备考月历
2015考研数学复习：常见的五大错误	2015考研八大统考专业课复习指导