| Y-Ba-Cu-O超导体的声子异常 |
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| 引用本文： | 阮景辉,李际周,俞实孙,甘舒,牛世文,勾成,叶春堂,刘振义,郑香苗,林炳雄,李传义,卫崇德.Y-Ba-Cu-O超导体的声子异常[J].原子能科学技术,1987(3). |
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| 作者姓名： | 阮景辉 李际周 俞实孙 甘舒 牛世文 勾成 叶春堂 刘振义 郑香苗 林炳雄 李传义 卫崇德 |
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| 作者单位： | 中国原子能科学研究院，中国原子能科学研究院，中国原子能科学研究院，中国原子能科学研究院，中国原子能科学研究院，中国原子能科学研究院，中国原子能科学研究院，北京大学化学系，北京大学化学系，北京大学化学系，北京大学物理系，北京大学物理系 北京，北京，北京，北京，北京，北京，北京 |
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| 摘 要： | 利用中国原子能科学研究院重水反应堆旁的Be过滤探测器中子非弹性散射谱仪,测量了Y-Ba-Cu-O超导体在298K和87K两种温度下的广义声子谱,结果如图1所示。当温度在低于超导转变温度T_e(90.5K)的87 K时,声子谱在能量小于6 meV处出现了较强的声学模,而在289 K 时10 neV和19 meV处呈现的两个低频模消失了,也可能
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ANOMALOUS PHONON BEHAVIOR OF SUPERCONDUTOR Y-Ba-Cu-O |
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| RUAN JINGHUI,LI JIZHOU,YU ANSUN,GAN SHU,NIU SHIWEN,GOU CHENG,YE CHUNTANG,LIU ZHENYI,ZHENG XIANGMIAO,LIN BINGXIONG,LI CHUANYI,WEI CHONGDE Institute of Atomic Energy,P. O. Box ,Beijing.ANOMALOUS PHONON BEHAVIOR OF SUPERCONDUTOR Y-Ba-Cu-O[J].Atomic Energy Science and Technology,1987(3). |
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| Authors: | RUAN JINGHUI LI JIZHOU YU ANSUN GAN SHU NIU SHIWEN GOU CHENG YE CHUNTANG LIU ZHENYI ZHENG XIANGMIAO LIN BINGXIONG LI CHUANYI WEI CHONGDE Institute of Atomic Energy P O Box Beijing |
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| Affiliation: | RUAN JINGHUI,LI JIZHOU,YU ANSUN,GAN SHU,NIU SHIWEN,GOU CHENG,YE CHUNTANG,LIU ZHENYI,ZHENG XIANGMIAO,LIN BINGXIONG,LI CHUANYI,WEI CHONGDE Institute of Atomic Energy,P. O. Box 275,Beijing Department of Physics,Beijing University Department of Physics,Beijing University |
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| Abstract: | The generalized phonon density state of Y-Ba-Cu-O superconductor (T_c=90.5 K) is measured at 289 K and 87 K respectively, by using Be filter detectorneutron inelastic scattering spectrometer at Institute of Atomic Energy. At 87 K,the optical mode at 76 meV which is estimated owing to Cu-O-Cu breathing modeand a stronger acoustic mode below 6 meV are observed, and the low frequencymodes at 10 meV and 19 meV in 289 K seems to be disappeared, or to be softened.It is possible that the anomalous change of phonon density state below T_c isresponsible for the higher superconducting transition temperature of Y-Ba-Cu-O. |
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| Keywords: | Superconductor Phonon density state |
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