Measurement of the Josephson Effect of Heavy-Fermion Superconductor UPt3 as a Test of the Odd-Parity Order Parameter
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概要
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The Josephson critical current I_{\text{c}} between a single-crystal UPt3 and Al has been measured for the junctions on the UPt3 surface perpendicular to the hexagonal a[11\bar{2}0], b[10\bar{1}0], and c[0001] axes. The magnetic field dependence of I_{\text{c}} shows a Fraunhofer diffraction pattern for a current flow parallel to the c-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 the a- and b-axes. These results contradict the E_{2u} scenario for the odd-parity order parameter in UPt3, in which the Josephson effect is forbidden in the three directions, whereas the recently proposed E_{1u} scenario permits, at least, the a- and c-axis Josephson couplings.
- 2012-11-15
著者
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Kimura Noriaki
Center For Low Temperature Science Tohoku University
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Yamamoto Etsuji
Advanced Science Research Center Japan Atomic Energy Agency
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Onuki Yoshichika
Graduate School Of Science Osaka University
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Sumiyama Akihiko
Graduate School Of Material Science University Of Hyogo
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Motoyama Gaku
Graduate School Of Material Science University Of Hyogo
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HAGA Yoshinori
Advance Science Research Center, Japan Atomic Energy Agency
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Yamaguchi Akira
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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Sumiyama Akihiko
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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GOUCHI Jun
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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Motoyama Gaku
Graduate School of Material Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan
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