Closing the Pseudogap by Zeeman Splitting in Bi_2Sr_2CaCu_2O_8+y at High Magnetic Fields

T. Shibauchi; L. Krusin-Elbaum; Ming Li; M. P. Maley; P. H. Kes

doi:10.1103/PhysRevLett.86.5763

paper

Closing the Pseudogap by Zeeman Splitting in Bi_2Sr_2CaCu_2O_8+y at High Magnetic Fields

arXiv:cond-mat/0104261 · doi:10.1103/PhysRevLett.86.5763

Abstract

Interlayer tunneling resistivity is used to probe the low-energy density-of-states (DOS) depletion due to the pseudogap in the normal state of Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + y}$ . Measurements up to 60 T reveal that a field that restores DOS to its ungapped state shows strikingly different temperature and doping dependencies from the characteristic fields of the superconducting state. The pseudogap closing field and the pseudogap temperature $T^{⋆}$ evaluated independently are related through a simple Zeeman energy scaling. These findings indicate a predominant role of spins over the orbital effects in the formation of the pseudogap.

5 pages, 4 figures, presented at the APS March 2001 meeting, will appear in Phys. Rev. Lett

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