Core Size Effect on the Vortex Quasiparticle Excitations in Overdoped $La_{2-x}Sr_xCuO_4$ Single Crystals

Z. Y. Liu; H. H. Wen; T. Xiang; Seiki Komiya; X. F. Sun; Yoichi Ando

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Core Size Effect on the Vortex Quasiparticle Excitations in Overdoped $La_{2-x}Sr_xCuO_4$ Single Crystals

Z. Y. Liu·H. H. Wen·T. Xiang·Seiki Komiya·X. F. Sun·Yoichi Ando

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Abstract

Low temperature specific heat has been measured for an overdoped $La_{2-x}Sr_xCuO_4$ (x = 0.22) single crystal. The quasiparticle density of states (DOS) in the mixed state is found to deviate from the predicted scaling law $C_{vol}=Hf(T/H^{1/2})$. However, this scaling behavior is nicely reconciled if one considers the normal core region ($ξ\approx$ 21$Å$) 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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Z. Y. Liu, H. H. Wen, T. Xiang, Seiki Komiya, X. F. Sun, Yoichi Ando. 2003-01-21. Core Size Effect on the Vortex Quasiparticle Excitations in Overdoped $La_{2-x}Sr_xCuO_4$ Single Crystals. https://arxiv.org/abs/cond-mat/0301366

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