Point-contact spectroscopy of the electron-doped cuprate superconductorPr2−xCexCuO4:The dependence of conductance-voltage spectra on cerium doping, barrier strength, and magnetic field

2003/03/19 by M. M. Qazilbash, Amlan Biswas, Y. Dagan +3 · 41 citations
Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Analytical Chemistry (journal) #Chemistry #Condensed matter physics #Conductance #Cuprate #Doping #Materials science #Pairing #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum mechanics #Spectroscopy #Superconductivity #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.68.024502

published in Physical review. B, Condensed matter 68(2) (American Physical Society) · 13 pages, 9 figures

arxiv created 2003/03/19 · openalex publication_date 2003/07/09 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present conductance-voltage (G\ensuremath-V) data for point-contact junctions between a normal metal and the electron-doped cuprate superconductor Pr_2\ensuremath-xCe_xCuO₄ (PCCO). We observe a zero-bias conductance peak for the underdoped composition of this cuprate (x=0.13) which is consistent with d-wave pairing symmetry. For optimally doped (x=0.15) and overdoped (x=0.17) PCCO, we find that the G\ensuremath-V characteristics indicate the presence of an order parameter without nodes. We investigate this further by obtaining point-contact spectroscopy data for different barrier strengths and as a function of magnetic field. We observe a gaplike feature at the Fermi energy in the normal state of PCCO (H>~H_c2) for all dopings.

Citations

• Evidence for a Transition in the Pairing Symmetry of the Electron-Doped CupratesLa2−xCexCuO4−yandPr2−xCexCuO4−y
• Breakdown of Fermi-liquid theory in a copper-oxide superconductor
• Andreev bound states, surfaces and subdominant pairing in high Tc superconductors
• Tunneling conductance of normal metal/dx2−y2-wave superconductor junctions in the presence of broken time-reversal symmetry states near interfaces
• Local and macroscopic tunneling spectroscopy ofY1−xCaxBa2Cu3O7−δfilms: Evidence for a doping-dependentisoridxycomponent in the order parameter
• Quantum Phase Transitions ind-Wave Superconductors

Cited by

• Strong-coupling d-wave superconductivity in PuCoGa5 probed by point-contact spectroscopy
• Progress and perspectives on electron-doped cuprates