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Title: Superconducting cuprate heterostructures for hot electron bolometers

Transport properties of the resistive state of quasi-two dimensional superconducting heterostructures containing ultrathin La{sub 2−x}Sr{sub x}CuO{sub 4} layers synthesized using molecular beam epitaxy are studied. The electron transport exhibits strong deviation from Ohm's law, δV∼γI{sup 3}, with a coefficient γ(T) that correlates with the temperature variation of the resistivity dρ/dT. Close to the normal state, analysis of the nonlinear behavior in terms of electron heating yields an electron-phonon thermal conductance per unit area g{sub e−ph}≈1 W/K cm{sup 2} at T = 20 K, one-two orders of magnitude smaller than in typical superconductors. This makes superconducting LaSrCuO heterostructures to be attractive candidate for the next generation of hot electron bolometers with greatly improved sensitivity.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics, City College of New York, New York 10031 (United States)
  2. SUNY Research Foundation, SUNY at Buffalo, Buffalo, New York 14226 (United States)
Publication Date:
OSTI Identifier:
22217834
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 22; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BOLOMETERS; CARRIERS; CUPRATES; ELECTRIC CONDUCTIVITY; HEATING; HIGH-TC SUPERCONDUCTORS; LANTHANUM COMPOUNDS; LAYERS; MOLECULAR BEAM EPITAXY; NONLINEAR PROBLEMS; OHM LAW; PHONONS; SENSITIVITY; STRONTIUM COMPOUNDS; THERMAL CONDUCTIVITY; TWO-DIMENSIONAL CALCULATIONS; VARIATIONS; YIELDS