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8 Feb 1999

Volume 74, Issue 6, pp. 777-892

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Intrinsic picosecond response times of Y–Ba–Cu–O superconducting photodetectors

M. Lindgren, M. Currie, C. Williams, T. Y. Hsiang, P. M. Fauchet, Roman Sobolewski, S. H. Moffat, R. A. Hughes, J. S. Preston, and F. A. Hegmann

Appl. Phys. Lett. 74, 853 (1999); http://dx.doi.org/10.1063/1.123388 (3 pages) | Cited 46 times

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We report our femtosecond time-resolved measurements on the photoresponse of an epitaxial YBa2Cu3O7−x (YBCO) thin-film photodetector, patterned into a microbridge geometry. By varying the current–voltage biasing conditions between the superconducting and resistive (hot spot) states, we observed transients that correspond to the nonequilibrium kinetic-inductance and the nonequilibrium electron-heating response mechanisms, respectively. The two-temperature model and the Rothwarf–Taylor theory have been used to simulate the measured wave forms and to extract the temporal parameters. The electron thermalization time and the electron–phonon energy relaxation time were determined by the electron temperature rise and decay times, which were found to be 0.56 and 1.1 ps, respectively, in the resistive state. We have also measured the ratio between the phonon and electron specific heats to be 38, which corresponds to a phonon–electron scattering time of 42 ps. No phonon-trapping effect (typical for low-temperature superconductors) was observed in YBCO, in the superconducting state, so the quasiparticle lifetime was given by the quasiparticle recombination time, estimated from the Rothwarf–Taylor equations to be below 1 ps. © 1999 American Institute of Physics.
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85.25.Pb Superconducting infrared, submillimeter and millimeter wave detectors
85.60.Gz Photodetectors (including infrared and CCD detectors)
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
74.25.Gz Optical properties
74.25.Kc Phonons
85.25.Cp Josephson devices

Crystallographic and magnetic properties of intermetallic compound Nd3Co13B2

Yi Chen, Q. L. Liu, J. K. Liang, X. L. Chen, B. G. Shen, and F. Huang

Appl. Phys. Lett. 74, 856 (1999); http://dx.doi.org/10.1063/1.123389 (3 pages) | Cited 10 times

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The crystal structure and magnetic properties of the intermediate compound Nd3Co13B2 have been investigated by x-ray diffraction and magnetic measurement. Nd3Co13B2 is a member of homologous series Rm+1Co5m+3B2 with m = 2. It adopts the hexagonal La3Ni13B2-type structure with lattice parameters a = 5.0722(4) Å and c = 10.7840(5) Å. The Nd3Co13B2 compound is ferromagnetic with a Curie temperature of 420 K. Its saturation magnetic moment and anisotropy field are 20.8 μB/f.u. and 163 kOe at 1.5 K, respectively. © 1999 American Institute of Physics.  
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61.66.Dk Alloys
75.50.Cc Other ferromagnetic metals and alloys
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.40.-s Critical-point effects, specific heats, short-range order
75.30.Gw Magnetic anisotropy
75.30.Cr Saturation moments and magnetic susceptibilities
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