Magnetic Penetration Depth Measurements of Pr${}_{2-x}$Ce${}_x$CuO${}_{4-\delta }$ Films on Buffered Substrates: Evidence for a Nodeless Gap

Abstract

We report measurements of the inverse squared magnetic penetration depth, ${\lambda }^{-2}(T)$, in Pr${}_{2-x}$Ce${}_x$CuO${}_{4-\delta }$ ($0.115\le x\le 0.152$) superconducting films grown on SrTiO${}_3$ (001) substrates coated with a buffer layer of insulating Pr${}_2$CuO${}_4$. ${\lambda }^{-2}(0)$, $T_c$ and normal-state resistivities of these films indicate that they are clean and homogeneous. Over a wide range of Ce doping, $0.124\le x\le 0.144$, ${\lambda }^{-2}(T)$ at low $T$ is flat: it changes by less than 0.15% over a factor of 3 change in $T$, indicating a gap in the superconducting density of states. Fits to the first 5% decrease in ${\lambda }^{-2}(T)$ produce values of the minimum superconducting gap in the range of $0.29\le {\Delta }_{\min }/k_B{T}_c\le 1.01$.

arXiv comment4 pages 5 figures

References in corpus (10)

• Phase-sensitive Evidence for d-wave Pairing Symmetry in Electron-doped Cuprate Superconductors
• Evidence of a d to s-wave pairing symmetry transition in the electron-doped cuprate superconductor Pr${}_{2-x}$Ce${}_x$CuO${}_4$
• Superconducting Gap Anisotropy in Nd${}_{1.85}$Ce${}_{0.15}$CuO${}_4$: Results from Photoemission
• Evidence for nodal quasiparticles in electron-doped cuprates from penetration depth measurements
• Evidence for a Transition in the Pairing Symmetry of the Electron-Doped Cuprates La_{2-x}Ce_xCuO_{4-y} and Pr_{2-x}Ce_xCuO_{4-y}
• Observation of Bound Surface States in Grain Boundary Junctions of High Temperature Superconductors
• Microwave Electrodynamics of Electron-Doped Cuprate Superconductors
• Anomalous Low Temperature Behavior of Superconducting Nd(1.85)Ce(0.15)CuO(4-y)
• Strongly correlated s-wave pairing in the n-type infinite-layer cuprate
• Evidence for a Nodeless Gap from the Superfluid Density of Optimally Doped Pr_{1.855}Ce_{0.145}CuO_{4-y} Films

Cited by in corpus (31)

• Progress and perspectives on the electron-doped cuprates
• Magnetic Penetration Depth in Unconventional Superconductors
• Electronic Structure of Electron-doped Sm1.86Ce0.14CuO4: Strong `Pseudo-Gap' Effects, Nodeless Gap and Signatures of Short Range Order
• Intermediate Coupling Model of the Cuprates
• Evolution of Superconductivity in Electron-Doped Cuprates: Magneto-Raman Spectroscopy
• Superfluid response in electron-doped cuprate superconductors
• Phase-sensitive order parameter symmetry test experiments utilizing Nd2-xCexCuO4-y/Nb zigzag junctions
• Nodeless d-wave superconducting pairing due to residual antiferromagnetism in underdoped Pr${}_{2-x}$Ce${}_x$CuO${}_{4-\delta }$
• Distinct Pairing Symmetries in $N{d}_{1.85}C{e}_{0.15}Cu{O}_{4-y}$ and $L{a}_{1.89}S{r}_{0.11}Cu{O}_4$ Single Crystals: Evidence from Comparative Tunnelling Measurements
• Kinetic-energy driven superconductivity in cuprate superconductors
• s-Wave-Like excitation in the superconducting state of electron-doped cuprates with d-wave pairing
• Two-Fermi-surface superconducting state and a nodal d-wave gap in the electron-doped Sm(1.85)Ce(0.15)CuO(4-d) cuprate superconductor
• Anomalously Sharp Superconducting Transitions in Overdoped $L{a}_{2-x}S{r}_{x}Cu{O}_4$ Films
• Pairing mechanism of high-temperature superconductivity: Experimental constraints
• Theory of Raman scattering on electron-doped high-$T_c$ superconductor
• Transport anomalies and quantum criticality in electron-doped cuprate superconductors
• Superconductivity and topological Fermi surface transitions in electron-doped cuprates near optimal doping
• Magnetic field dependence of the low-temperature specific heat of the electron-doped superconductor Pr1.85Ce0.15CuO4
• BCS $d$-wave behavior in the THz electrodynamic response of electron-doped cuprate superconductors
• Theory of point contact spectroscopy in electron-doped cuprates
• An Alternative Interpretation of the Magnetic Penetration Depth Data on Pr(2-x)Ce(x)CuO(4-y) and La(2-x)Ce(x)CuO(4-y)
• Reply to "Comment on 'Isotope effect in high-Tc superconductors' "
• Penetration depth of electron-doped-infinite-layer Sr${}_{0.88}$La${}_{0.12}$CuO${}_{2+x}$ thin films
• Superconducting materials - a topical overview
• Electromagnetic response of high-Tc superconductors -- the slave-boson and doped-carrier theories
• Superfluid response in heavy fermion superconductors
• Doping dependence of Meissner effect in triangular-lattice superconductors
• Superfluid density in the slave-boson theory
• Non-BCS temperature dependence of energy gap in thin film electron-doped cuprates
• Doping dependence of electromagnetic response in electron-doped cuprate superconductors
• Electromagnetic response of cuprate superconductors with coexisting electronic nematicity