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Low Temperature Specific Heat of the Underdoped La2-xSrxCuO4 Single Crystals |
| LIU Zhi-Yong;YANG Hai-Peng;LU Xi-Feng;ZHOU Fang;WEN Hai-Hu |
| National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080 |
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| Cite this article: |
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LIU Zhi-Yong, YANG Hai-Peng, LU Xi-Feng et al 2004 Chin. Phys. Lett. 21 374-377 |
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Abstract 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 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/(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.
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| Keywords:
74.20.Rp
74.25.Dw
74.25.Fy
74.72.Dn
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Published: 01 February 2004
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