Abstract
The quasiparticle density of states (DOS) is measured as a function of magnetic fields up to 9 T by the short-pulse interlayer tunneling spectroscopy for slightly overdoped Bi2Sr2CaCu2O8+δ. It is found that the quasiparticle DOS near the Fermi level EF remains almost unchanged when the magnetic field parallel to the c-axis is applied up to 9 T. This is totally at variance with the conventional behavior in which the quasiparticle DOS at EF increases with the increasing magnetic field. The present result implies that the quasiparticles involved in pairing come from higher energies apart from EF, providing evidence for unconventional pairing mechanism.
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