Closing the pseudogap by Zeeman splitting in Bi2Sr2CaCu2O8+y at high magnetic fields

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)Q(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 inde pendently are related through a simple Zeeman energy scaling. These. findin gs indicate a predominant role of spins over the orbital effects in the for mation of the pseudogap.