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Hysteresis of the work function of Co(0001) surface resulting from an allotropic transformation (1992)

Saito, S. ; Takeda, K. ; Soumura, T. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 71 (1992), S. 5500-5503

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The influence of the crystallographic phase transformation on the work function was studied on a Co(0001) surface by a precise measurement of the contact potential difference. The characteristic hysteresis of the work function due to the hcp(arrow-right-and-left)fcc allotropic transformation was found. The work function changes abruptly by about 2 meV with the phase transformation while decreasing monotonically with temperature except in the transformation range. The contributions of the surface dipole barrier and the chemical potential of electrons to the work function are discussed from the point of view of cellular approximation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.350523

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Digitale Medien

A simple ac susceptibility measuring system at low temperatures (1992)

Soumura, T. ; Tsutsui, K. ; Azuma, T. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 63 (1992), S. 4006-4007

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ISSN: 1089-7623

Quelle: AIP Digital Archive

Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik

Notizen: An automated ac susceptibility measuring system based on an ac mutual inductance bridge is described. A personal computer and a digital-analog converter are used to control the amplitude and phase of the compensatory signal which balances the bridge. An analog multiplier and a variable-resistance photocoupler are used in the amplitude and phase control circuits, respectively. The magnetic moment of a sample for a 1-μV output voltage is 3.8×10−6 emu/μV. Sufficient sensitivity was confirmed for an application to oxide superconductors.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1143255

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Digitale Medien

Optical and electronic properties of cobalt-doped zinc oxide films prepared by the sputtering method (1992)

Kobayashi, K. ; Maeda, T. ; Matsushima, S. ; [weitere]

Springer

Journal of materials science 27 (1992), S. 5953-5957

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ISSN: 1573-4803

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract In-doped ZnO, Co-doped ZnO and Li-doped NiO are successively deposited on quartz by the sputtering method. A current versus voltage curve of the three-layer device, in which the Indoped ZnO and Li-doped NiO are used as electrodes, reveals that the In-doped ZnO is an ohmic electrode and the Li-doped NiO is a blocking electrode with respect to electron injection. In photocurrent spectra of the three-layer device, there are two distinct peaks around 410 and 640 nm. The former is ascribed to the photoionization caused by the electric-dipole transition from the ground states,4A2(F), to the conduction band, and the latter to the thermal emission from electronic excited states of Co2+,4T1(P).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01119767

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