Physics – Condensed Matter – Superconductivity
Scientific paper
2002-12-18
Phys. Rev. B 69, 144506 (2004)
Physics
Condensed Matter
Superconductivity
3 pages, 3 figures
Scientific paper
10.1103/PhysRevB.69.144506
hether the node in the order parameter characteristic of a $d-wave$ superconductor can or cannot be removed by an applied magnetic field has been a subject of debate in recent years. Thermal conductivity results on the high Tc superconductor $Bi_{2}Sr_{2}CaCu_{2}O_{8}$ originally explained by Laughlin in terms of such a node removal were complicated by hysteresis effects, and judged inconclusive. We present new tunneling data on $YBa_{2}Cu_{3}O_{7-x}$ that support the existence of the node removal effect, under specific orientations of the sample's surfaces and magnetic field. We also explain the hysteretic behavior and other previous tunneling results so far not understood satisfactorily, attributing them to a combination of node removal and Doppler shift of low energy surface bound states.
Beck Rainer
Dagan Yoram
Deutscher Guy
Gerber Alexander
Milner Alexander A.
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