Low Temperature Specific Heat in La2CuO4 and the High Temperature Superconductor La1.85Sr0.15CuO4-y
- 1 January 1987
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 26 (S3-2)
- https://doi.org/10.7567/jjaps.26s3.1117
Abstract
At lowest temperature the specific heat of La1.85Sr.15CuO4-y and La2CuO4 is dominated by a large T-2-term arising from a nuclear specific heat contribution. When attributing this to the quadrupole splitting of either the La or Cu nucleus unusually large electric field gradients (1018-1019 V/cm2) are obtained. The alternative of an antiferromagnetic ground state of the Cu ions is discussed. Above 2 K all samples show a T3-term corresponding to rather low Debye temperatures of 130 - 200 K. To fit the total specific heat for La2CuO4 an additional linear term must be assumed whereas for superconducting La1.85Sr.15CuO4 a phenomenological T1/2-behaviour gives the better description for the additional contribution.Keywords
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