Low-Temperature Specific Heat of the Underdoped La2-xSrxCuO4 Single Crystals

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2004,（2）
• 页码范围: 374-377
• 页数: 4页
• 语种: 英文

摘要

We report the low-temperature specific heat of La2-xSrxCuO4 (x = 0.063) single crystals before and after annealing in the temperature region of 2-10 K and magnetic fields up to 12 T. The data confirm the √H dependence of the linear term coefficient γpredicted for d-wave paring in the Volovik theory at T = 0 K. However, the data do not satisfy the proposed Simon-Lee scaling law at finite temperatures, i.e. CDOs/ (T2) = f(T/ √H), where f is an unknown scaling function and CDos is the extra specific heat contributed by the nodal quasiparticles due to the Doppler effect. Possible reasons for this failure are presented.