Magnetic field dependence of the low-temperature specific heat of the electron-doped superconductor Pr1.85Ce0.15CuO4

Abstract

We remeasured the magnetic field dependence of the low-temperature specific heat of the electron-doped superconductor Pr1.85Ce0.15CuO4 (T_C=22\pm 2K) under a different measurement procedure. Under field-cooling, the electronic specific heat follows C_{el}(H, T)=γ(H)T from 4.5K down to 1.8K. In the field range H_{C1}<H<0.5 H_{C2}, the Sommerfeld coefficient γ(H) is well fit by a power-law γ(H)\sim H^{1/2}. This result suggests that the pairing symmetry is d-wave-like at all temperatures below 4.5K. Our new measurement shows no evidence for the linear field dependence of γ(H) found previously at T=2K.

4 pages, 3 figures

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• Unconventional Superconductivity
• Quantum phase transitions from topology in momentum space
• s-Wave-Like excitation in the superconducting state of electron-doped cuprates with d-wave pairing
• Possible manifestation of spin fluctuations in the temperature behavior of resistivity in Sm_{1.85}Ce_{0.15}CuO_4 thin films
• Specific Heat Investigation for Line Nodes in Heavily Overdoped Ba1-xKxFe2As2
• Influence of structural disorder on low-temperature behavior of penetration depth in electron-doped high-T_C thin films
• Probing pairing symmetry of Sm_{1.85}Ce_{0.15}CuO_4 via highly-sensitive voltage measurements: Evidence for strong impurity scattering