Energy gap structure and tunneling characteristics of layered superconductors

Technical Report · Tue Jun 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/29426· OSTI ID:29426

Liu, S H ^[1]; Klemm, R A ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. Argonne National Lab., IL (United States)

The authors have analyzed the energy gaps and density-of-states (DOS) of layered superconductors with two inequivalent layers in a unit cell along the c-axis. In the physically interesting parameter range where the interlayer hopping strengths of the quasiparticles are comparable to the critical temperature, the peaks in the DOS curve do not correspond to the order parameters (OP`s) of each layer, but depend on the OP`s and the interlayer hopping strengths in a complex manner. In contrast to a BCS superconductor, the DOS of layered systems have logarithmic singularities. The simulated tunneling characteristics bear close resemblance to experimental results.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 29426
• Report Number(s): ANL/MSD/PP-79992; ON: DE95005879; TRN: 95:002825
• Resource Relation: Other Information: PBD: Jun 1993
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
SUPERCONDUCTORS
ELECTRONIC STRUCTURE
ENERGY GAP
TUNNEL EFFECT
LAYERS