Josephson Effect of Heavy-Fermion Superconductor UPt3 as a Test of the Odd-Parity Order Parameter
Josephson Effect of Heavy-Fermion Superconductor UPt3 as a Test of the Odd-Parity Order Parameter
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重费米子超导体UPt3的约瑟夫森效应作为奇宇称序参数的检验
DOI：
10.1143/jpsj.81.113701
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
J. Gouchi
中科院分区：
文献类型：
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作者：
K. Kudo;M. Takasuga;Y. Okamoto;Z. Hiroi;and M. Nohara;M. Nohara;M. Nohara;M. Nohara;M. Nohara;M. Nohara;野原実;M. Nohara;M. Nohara;M. Nohara;M. Nohara;M. Nohara;M. Nohara;M. Nohara;野原実;M. Nohara;野原実;野原実;M. Nohara;M. Nohara;野原実;kuto Kawasaki;Shunichiro Kittaka;Y. Haga;T.D. Matsuda;Y. Onuki;M. Sakoda;Y. Shimizu;T. Sakakibara;J. Gouchi
测量了UPt3单晶表面垂直于六边形a [11\bar20]，B[10\bar10]，c [0001]轴的结与Al之间的约瑟夫森临界电流Ic。的磁场依赖的Ic示出了夫琅和费衍射图案的电流平行于轴，这表明约瑟夫森耦合是均匀的整个结。在平行于a轴和b轴的电流中，观察到对夫琅和费模式的微小修改。这些结果与UPt3中奇宇称序参量的E2 uscenario相矛盾，其中约瑟夫森效应在三个方向上是被禁止的，而最近提出的E1 uscenario至少允许a轴和c轴约瑟夫森耦合。
The Josephson critical currentIcbetween a single-crystal UPt3and Al has been measured for the junctions on the UPt3surface perpendicular to the hexagonala[11\bar20],b[10\bar10], andc[0001] axes. The magnetic field dependence ofIcshows a Fraunhofer diffraction pattern for a current flow parallel to thec-axis, suggesting that the Josephson coupling is uniform throughout the junction. Small modifications applied to the Fraunhofer pattern have been observed for a current flow parallel to thea- andb-axes. These results contradict theE2uscenario for the odd-parity order parameter in UPt3, in which the Josephson effect is forbidden in the three directions, whereas the recently proposedE1uscenario permits, at least, thea- andc-axis Josephson couplings.