考研英语阅读篇章揭开高温超导体的神秘面纱
<p> 篇章：揭开高温超导体的神秘面纱</p><p> <span word="A">A</span> <span word="Binghamton">Binghamton</span> <span word="University">University</span> <span word="physicist">physicist</span> <span word="and">and</span> <span word="his">his</span> <span word="colleagues">colleagues</span> <span word="say">say</span> <span word="they">they</span> <span word="have">have</span> <span word="unlocked">unlocked</span> <span word="one">one</span> <span word="key">key</span> <span word="mystery">mystery</span> <span word="surrounding">surrounding</span> <span word="high">high</span>-<span word="temperature">temperature</span> <span word="superconductivity">superconductivity</span>. <span word="Their">Their</span> <span word="research">research</span>, <span word="published">published</span> <span word="this">this</span> <span word="week">week</span> <span word="in">in</span> <span word="the">the</span> <span word="Proceedings">Proceedings</span> <span word="of">of</span> <span word="the">the</span> <span word="National">National</span> <span word="Academy">Academy</span> <span word="of">of</span> <span word="Sciences">Sciences</span>, <span word="found">found</span> <span word="a">a</span> <span word="remarkable">remarkable</span> <span word="phenomenon">phenomenon</span> <span word="in">in</span> <span word="copper">copper</span>-<span word="oxide">oxide</span> <span word="high">high</span>-<span word="temperature">temperature</span> <span word="superconductors">superconductors</span>. <span word="Michael">Michael</span> <span word="Lawler">Lawler</span>, <span word="assistant">assistant</span> <span word="professor">professor</span> <span word="of">of</span> <span word="physics">physics</span> <span word="at">at</span> <span word="Binghamton">Binghamton</span>, <span word="is">is</span> <span word="part">part</span> <span word="of">of</span> <span word="an">an</span> <span word="international">international</span> <span word="team">team</span> <span word="of">of</span> <span word="physicists">physicists</span> <span word="with">with</span> <span word="an">an</span> <span word="ongoing">ongoing</span> <span word="interest">interest</span> <span word="in">in</span> <span word="the">the</span> <span word="mysterious">mysterious</span> <span word="pseudogap">pseudogap</span> <span word="phase">phase</span>, <span word="the">the</span> <span word="phase">phase</span> <span word="situated">situated</span> <span word="between">between</span> <span word="insulating">insulating</span> <span word="and">and</span> <span word="superconducting">superconducting</span> <span word="phases">phases</span> <span word="in">in</span> <span word="the">the</span> <span word="cuprate">cuprate</span> <span word="phase">phase</span> <span word="diagram">diagram</span>.</p><p> <span word="Evidence">Evidence</span> <span word="has">has</span> <span word="been">been</span> <span word="accumulating">accumulating</span> <span word="that">that</span> <span word="this">this</span> <span word="phase">phase</span> <span word="supports">supports</span> <span word="an">an</span> <span word="exotic">exotic</span> <span word="density">density</span> <span word="wave">wave</span> <span word="state">state</span> <span word="that">that</span> <span word="may">may</span> <span word="be">be</span> <span word="key">key</span> <span word="to">to</span> <span word="its">its</span> <span word="existence">existence</span>, <span word="the">the</span> <span word="physicists">physicists</span> <span word="write">write</span> <span word="in">in</span> <span word="the">the</span> <span word="new">new</span> <span word="journal">journal</span> <span word="article">article</span>. <span word="A">A</span> <span word="density">density</span> <span word="wave">wave</span> <span word="forms">forms</span> <span word="in">in</span> <span word="a">a</span> <span word="metal">metal</span> <span word="if">if</span> <span word="the">the</span> <span word="fluid">fluid</span> <span word="electrons">electrons</span> <span word="themselves">themselves</span> <span word="crystalize">crystalize</span>.</p><p> <span word="Using">Using</span> <span word="a">a</span> <span word="scanning">scanning</span> <span word="tunneling">tunneling</span> <span word="microscope">microscope</span> <span word="to">to</span> <span word="visualize">visualize</span> <span word="the">the</span> <span word="electronic">electronic</span> <span word="structure">structure</span> <span word="of">of</span> <span word="the">the</span> <span word="oxygen">oxygen</span> <span word="sites">sites</span> <span word="within">within</span> <span word="a">a</span> <span word="superconductor">superconductor</span>, <span word="the">the</span> <span word="team">team</span> <span word="found">found</span> <span word="a">a</span> <span word="density">density</span> <span word="wave">wave</span> <span word="with">with</span> <span word="a">a</span> <span word="d">d</span>-<span word="orbital">orbital</span> <span word="structure">structure</span>. <span word="That">That</span> <span word="s">s</span> <span word="especially">especially</span> <span word="surprising">surprising</span> <span word="because">because</span> <span word="most">most</span> <span word="density">density</span> <span word="waves">waves</span> <span word="have">have</span> <span word="an">an</span> <span word="s">s</span>-<span word="orbital">orbital</span> <span word="structure">structure</span>; <span word="their">their</span> <span word="electron">electron</span> <span word="density">density</span> <span word="is">is</span> <span word="isotropic">isotropic</span>. <span word="It">It</span> <span word="s">s</span> <span word="not">not</span> <span word="the">the</span> <span word="pattern">pattern</span> <span word="you">you</span> <span word="would">would</span> <span word="expect">expect</span>, <span word="Lawler">Lawler</span> <span word="says">says</span>.</p><p> <span word="In">In</span> <span word="this">this</span> <span word="research">research</span>, <span word="Lawler">Lawler</span> <span word="and">and</span> <span word="his">his</span> <span word="colleagues">colleagues</span> <span word="focused">focused</span> <span word="on">on</span> <span word="a">a</span> <span word="member">member</span> <span word="of">of</span> <span word="the">the</span> <span word="cuprate">cuprate</span> <span word="class">class</span> <span word="of">of</span> <span word="superconductors">superconductors</span> <span word="called">called</span> <span word="bismuth">bismuth</span> <span word="strontium">strontium</span> <span word="calcium">calcium</span> <span word="copper">copper</span> <span word="oxide">oxide</span> . <span word="We">We</span> <span word="now">now</span> <span word="believe">believe</span> <span word="these">these</span> <span word="density">density</span> <span word="waves">waves</span> <span word="exist">exist</span> <span word="in">in</span> <span word="all">all</span> <span word="cuprates">cuprates</span>, <span word="says">says</span> <span word="Lawler">Lawler</span>, <span word="a">a</span> <span word="theorist">theorist</span> <span word="whose">whose</span> <span word="contribution">contribution</span> <span word="to">to</span> <span word="the">the</span> <span word="research">research</span> <span word="involved">involved</span> <span word="subtle">subtle</span> <span word="uses">uses</span> <span word="of">of</span> <span word="the">the</span> <span word="Fourier">Fourier</span> <span word="transform">transform</span>, <span word="a">a</span> <span word="mathematical">mathematical</span> <span word="analysis">analysis</span> <span word="that">that</span> <span word="s">s</span> <span word="useful">useful</span> <span word="when">when</span> <span word="examining">examining</span> <span word="amplitude">amplitude</span> <span word="patterns">patterns</span> <span word="in">in</span> <span word="waves">waves</span>.</p>
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