Low-Temperature Specific Heat of the Underdoped La2-xSrxCuO4 Single Crystals |
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作者姓名: | 刘志勇 杨海朋 鲁希锋 周放 闻海虎 |
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作者单位: | NationalLaboratoryforSuperconductivity,InstituteofPhysics,ChineseAcademyofSciences,POBox603,Beijing100080 |
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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 2-10K and magnetic fields up to 12T.The data confirm the √H dependence of the linear term coefficient γ predicted 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/(T^2)=fT√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.
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关 键 词: | 铜酸锶镧 单晶体 磁场 掺杂 多普勒效应 半导体材料 |
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