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We use interlayer intrinsic tunneling resistivity to probe the pseudogap in Bi2Sr2CaCu2O8+y in magnetic fields up to 60 T. A map of the field–temperature (H–T) diagram of the pseudogap state reveals the pseudogap as a dominant feature up to very high levels of hole doping. The unconventionally large quantum fluctuation regime observed on the overdoped side is consistent with the pseudogap in the vortex cores. Unlike the characteristic fields of the superconducting state, the field that closes the pseudogap at low temperatures is temperature-independent. It is related to the pseudogap temperature T★ through a simple Zeeman energy scale, pointing to the pseudogap controlled by the spin rather than the orbital degrees of freedom. [Copyright &y& Elsevier]

From the c-axis interlayer resistivity measurements in a field up to 60 T, we evaluate the pseudogap closing field Hpg at which the low-energy density of state is restored to its ungapped value. We find that Hpg becomes temperature independent at low temperatures, in contrast to the characteristic fields of the superconducting state. The Zeeman energy of Hpg is scaled by the pseudogap temperature, indicating a predominant role of spins over the orbital effects in the formation of the pseudogap. [Copyright &y& Elsevier]

From the c-axis interlayer resistivity measurements in a field up to 60 T, we evaluate the pseudogap closing field Hpg at which the low-energy density of state is restored to its ungapped value. We find that Hpg becomes temperature independent at low temperatures, in contrast to the characteristic fields of the superconducting state. The Zeeman energy of Hpg is scaled by the pseudogap temperature, indicating a predominant role of spins over the orbital effects in the formation of the pseudogap. [ABSTRACT FROM AUTHOR]