Low-temperature specific heat of La1.85Sr0.15CuO4 and La2CuO4

Y. P. Feng, A. Jin, D. Finotello, K. A. Gillis, M. H.W. Chan, J. E. Greedan

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The specific heat of polycrystalline samples of the high-Tc superconductor La1.85Sr0.15CuO4 and the undoped insulator La2CuO4 have been measured from 80 mK to 4 K and from 7 to 55 K. The low-temperature limit of the specific heat of La1.85Sr0.15CuO4 can be well accounted for by a sizable linear T term (T) in addition to the Debye-like term (BT3) with =1.8±0.2 mJ/K2 mol. A contribution due to possible magnetic impurities is also present. In contrast, the coefficient of the linear T term in La2CuO4 is found to be 0.2±0.2 mJ/K2 mol. The large linear T term in the superconducting sample suggests the presence of the Fermi-liquid-type excitations at low temperatures.

Original languageEnglish (US)
Pages (from-to)7041-7044
Number of pages4
JournalPhysical Review B
Issue number10
StatePublished - 1988

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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