Low temperature specific heat study on Pr$_{0.88}$LaCe$_{0.12}$CuO$_{4-\delta}$
ORAL
Abstract
By annealing the electron-doped Pr$_{0.88}$LaCe$_{0.12}$CuO$_{4-\delta}$ (PLCCO) in vacuum at different temperatures, we have successfully obtained several superconducting PLCCO samples with different T$_{c}$. The specific heat of all the samples show a 1/T$^2$ behavior below 1K. Above 1K, the low field specific heat can be fitted by $\gamma(H) T + \beta T^3$, where the $\gamma(H)$ is the Sommerfeld coefficient. We present magnetic field dependent data of $\gamma(H)$ for several samples of PLCCO and discuss the evolution of $\gamma(H)$ as PLCCO is tuned from an antiferromagnetically ordered insulator to a Tc=25 K superconductor.
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Authors
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Shiliang Li
University of Tennessee
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Songxue Chi
University of Tennessee, Knoxville, Univ. of Tennessee
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Pengcheng Dai
Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA, The University of Tennessee / ORNL, Univ. of Tenn. and ORNL, University of Tennessee/Oak Ridge National Laboratory
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Haihu Wen
National Laboratory for Superconductivity, Institute of Physics \& Center for Condensed Matter Physics, Beijing 100080, China