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

paper

Core Size Effect on the Vortex Quasiparticle Excitations in Overdoped $L a_{2 - x} S r_{x} C u O_{4}$ Single Crystals

arXiv:cond-mat/0301366

Abstract

Low temperature specific heat has been measured for an overdoped $L a_{2 - x} S r_{x} C u O_{4}$ (x = 0.22) single crystal. The quasiparticle density of states (DOS) in the mixed state is found to deviate from the predicted scaling law $C_{v o l} = H f (T / H^{1/2})$ . However, this scaling behavior is nicely reconciled if one considers the normal core region ( $ξ \approx$ 21 $A ˚$ ) 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.

4 Pages, 4 Figures

Core Size Effect on the Vortex Quasiparticle Excitations in Overdoped La2−x​Srx​CuO4​ Single Crystals

Abstract

Core Size Effect on the Vortex Quasiparticle Excitations in Overdoped $L a_{2 - x} S r_{x} C u O_{4}$ Single Crystals