Abstract
Based on the electronic specific heat and the bulk susceptibility data of oxygen-deficient YBa 2Cu 3O 7−δ, we present clear evidence of a pseudogap in the single-particle density of states (DOS) above T c in this system of oxide superconductors. Further analysis shows that the most likely shape of the gap is one in which the normal state DOS is zero at the Fermi level, then rises linearly and symmetrically to a cusp above the unmodified background. The size of the pseudogap is directly related with the number of lost carriers available for superconductivity and is proportional to δ. By comparing the measured entropy and the spin component of the susceptibility, we further conclude that spin and charge excitations do not separate in YBCO, and in the normal state, in this respect at least, they behave like an ordinary Fermi liquid.
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