Bulk evidence for $\mth{s}$-wave pairing symmetry in electron-doped infinite-layer cuprate $\chem{Sr_{0.9}La_{0.1}CuO_{2}}$

Z. Y. Liu; H. H. Wen; L. Shan; H. P. Yang; X. F. Lu; H. Gao; Min-Seok Park; C. U. Jung; Sung-Ik Lee

doi:doi:10.1209/epl/i2003-10315-8

Europhys. Lett., 69 (2), pp. 263-269 (2005)
DOI: 10.1209/epl/i2003-10315-8

Bulk evidence for $\mth{s}$ -wave pairing symmetry in electron-doped infinite-layer cuprate $\chem{Sr_{0.9}La_{0.1}CuO_{2}}$

Z. Y. Liu¹, H. H. Wen¹, L. Shan¹, H. P. Yang¹, X. F. Lu¹, H. Gao¹, Min-Seok Park², C. U. Jung² and Sung-Ik Lee²

¹ National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences - P.O. Box 603, Beijing 100080, PRC
² National Creative Research Initiative Center for Superconductivity and Department of Physics, Pohang University of Science and Technology Pohang 790-784, Republic of Korea

hhwen@aphy.iphy.ac.cn

received 14 October 2003; accepted in final form 8 November 2004
published online 17 December 2004

Abstract
The low-temperature specific heat of electron-doped (n-type) infinite-layer cuprate superconductor $\chem{Sr_{0.9}La_{0.1}CuO_{2}}$ was measured. The quasiparticle density of states (DOS) in the mixed state is found to be consistent with the predictions of the s-wave pairing symmetry, and agree very well with the earlier results from tunnelling measurement. This is contrary to the prediction of d-wave symmetry, which has been confirmed for the hole-doped (p-type) cuprates. Our results indicate that the electronic DOS in the mixed state are mainly contributed by the vortex core area in the present sample.

PACS
74.20.Rp - Pairing symmetries (other than s-wave).
74.25.Bt - Thermodynamic properties.
74.72.Dn - La-based cuprates.

© EDP Sciences 2005

Bulk evidence for -wave pairing symmetry in electron-doped infinite-layer cuprate

Bulk evidence for $\mth{s}$ -wave pairing symmetry in electron-doped infinite-layer cuprate $\chem{Sr_{0.9}La_{0.1}CuO_{2}}$