TUNNELING SPECTRA OF CU1BA2CA3CU4OY (CU-1234)

We have measured and studied the first tunneling spectra of the recent ly discovered [1] high T-c material Cu1Ba2Ca3Cu4Oy (Cu-1234). This mat erial has four Cu-O-2 layers and a T-c of 116 K. The tunneling spectra show sharp peaks indicative of the superconducting gap at 27 meV to 3 0 meV, giving a value of 2 Delta/kT(c) of 5.4 to 6.0. We will discuss and compare features of the tunneling spectra taken from Cu-1234 with those taken from the n=2 member of the Bi-based cuprates (Ba-2212), wh ich has a similar crystal structure.