Core Size Effect on the Vortex Quasiparticle Excitations in Overdoped La₂₋ₓSrₓCuO₄ Single Crystals
Liu, Z. Y. · Wen, H. H. · Xiang, T. · Komiya, Seiki · Sun, X. F. · Ando, Yoichi
Original · EN
Low temperature specific heat has been measured for an overdoped La₂₋ₓSrₓCuO₄ (x = 0.22) single crystal. The quasiparticle density of states (DOS) in the mixed state is found to deviate from the predicted scaling law Cvol=Hf(T/H¹/²). However, this scaling behavior is nicely reconciled if one considers the normal core region (ξ≈ 21Å) which gives small contribution to the total DOS. The radius of the core and other parameters derived are consistent with reported values. Our results suggest that there is no zero-bias conductance peak (ZBCP), which is predicted by the simple Bogoliubov de-Gennes theory in the vortex core of a d-wave superconductor.
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