Tunnelling spectroscopy of high‐temperature superconductors

A. L. de Lozanne; K. W. Ng; S. Pan; R. M. Silver; A. Berezin

doi:10.1111/j.1365-2818.1988.tb01368.x

Tunnelling spectroscopy of high‐temperature superconductors

A. L. de Lozanne, K. W. Ng, S. Pan, R. M. Silver, A. Berezin

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We measured samples of La_1·85Sr_0·15CuO_4‐y and YBa₂Cu₃O_7‐y with a UHV low‐temperature scanning tunnelling microscope using tips made out of tungsten, aluminium and indium. The samples are either sintered pellets, single crystals, or thin films. A wide variety of I‐V curves were obtained ranging from nearly ideal S‐I‐N and S‐I‐S characteristics, to strongly asymmetric and multiple‐peaked characteristics. The best data are obtained with thin film samples and indium tips. Large values of 2δ/kT_c (∼ 11) are observed in most cases. We discuss possible explanations for these large values. New data are presented obtained with thin films of Y‐Ba‐Cu‐O made by e‐beam evaporation in our laboratory. A system of loadlocks is used to ensure that these films are never exposed to the atmosphere. 1988 Blackwell Science Ltd

Original language	English
Pages (from-to)	117-122
Number of pages	6
Journal	Journal of Microscopy
Volume	152
Issue number	1
DOIs	https://doi.org/10.1111/j.1365-2818.1988.tb01368.x
State	Published - Oct 1988

Keywords

High‐temperature superconductors
STM

ASJC Scopus subject areas

Pathology and Forensic Medicine
Histology

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10.1111/j.1365-2818.1988.tb01368.x

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abstract = "We measured samples of La1·85Sr0·15CuO4‐y and YBa2Cu3O7‐y with a UHV low‐temperature scanning tunnelling microscope using tips made out of tungsten, aluminium and indium. The samples are either sintered pellets, single crystals, or thin films. A wide variety of I‐V curves were obtained ranging from nearly ideal S‐I‐N and S‐I‐S characteristics, to strongly asymmetric and multiple‐peaked characteristics. The best data are obtained with thin film samples and indium tips. Large values of 2δ/kTc (∼ 11) are observed in most cases. We discuss possible explanations for these large values. New data are presented obtained with thin films of Y‐Ba‐Cu‐O made by e‐beam evaporation in our laboratory. A system of loadlocks is used to ensure that these films are never exposed to the atmosphere. 1988 Blackwell Science Ltd",

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AU - de Lozanne, A. L.

AU - Ng, K. W.

AU - Pan, S.

AU - Silver, R. M.

AU - Berezin, A.

PY - 1988/10

Y1 - 1988/10

N2 - We measured samples of La1·85Sr0·15CuO4‐y and YBa2Cu3O7‐y with a UHV low‐temperature scanning tunnelling microscope using tips made out of tungsten, aluminium and indium. The samples are either sintered pellets, single crystals, or thin films. A wide variety of I‐V curves were obtained ranging from nearly ideal S‐I‐N and S‐I‐S characteristics, to strongly asymmetric and multiple‐peaked characteristics. The best data are obtained with thin film samples and indium tips. Large values of 2δ/kTc (∼ 11) are observed in most cases. We discuss possible explanations for these large values. New data are presented obtained with thin films of Y‐Ba‐Cu‐O made by e‐beam evaporation in our laboratory. A system of loadlocks is used to ensure that these films are never exposed to the atmosphere. 1988 Blackwell Science Ltd

AB - We measured samples of La1·85Sr0·15CuO4‐y and YBa2Cu3O7‐y with a UHV low‐temperature scanning tunnelling microscope using tips made out of tungsten, aluminium and indium. The samples are either sintered pellets, single crystals, or thin films. A wide variety of I‐V curves were obtained ranging from nearly ideal S‐I‐N and S‐I‐S characteristics, to strongly asymmetric and multiple‐peaked characteristics. The best data are obtained with thin film samples and indium tips. Large values of 2δ/kTc (∼ 11) are observed in most cases. We discuss possible explanations for these large values. New data are presented obtained with thin films of Y‐Ba‐Cu‐O made by e‐beam evaporation in our laboratory. A system of loadlocks is used to ensure that these films are never exposed to the atmosphere. 1988 Blackwell Science Ltd

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Tunnelling spectroscopy of high‐temperature superconductors

Abstract

Keywords

ASJC Scopus subject areas

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