Abstract
Within the charge-spin separation fermion-spin theory, the influence of a strong external magnetic field on the normal state transport of the underdoped cuprates is discussed. It is shown that when superconductivity in the underdoped cuprates is suppressed in the presence of a strong external magnetic field, the system reveals a low temperature normal state insulator–metal crossover. It is also shown that this striking insulator–metal crossover behavior is intriguingly related to the antiferromagnetic correlation.
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