Relationship between crystal chemistry and the local structure and electronic properties of Tl2Ba2Ca2Cu3O10 superconductors determined by scanning tunneling microscopy and spectroscopy

Zhe Zhang, Chia Chun Chen, Charles M. Lieber, Bruno Morosin, David S. Ginley, Eugene L. Venturini

Research output: Contribution to journalArticle

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Abstract

Scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) have been used to characterize the local structure and electronic properties of Tl2Ba2Ca2Cu3O10 single crystals prepared from 4:1:3:6 and 4:1:3:10 stoichiometry melts. Magnetic-susceptibility, resistivity, x-ray-fluorescence, and x-ray-diffraction measurements indicate that samples prepared from the 4:1:3:6 melts (type 1) have a chemical inhomogeneity, while crystals obtained from the 4:1:3:10 melts (type 2) are high quality. STM studies of the type-1 crystals demonstrate that the inhomogeneities can be associated with distortions in the TlO layer atomic structure. STS measurements on the distorted TlO layer of the type-1 samples have shown that this layer is also metallic. STM and STS investigations of the type-2 samples have shown, however, that the TlO layer in these crystals is tetragonal and semiconducting. In addition, a superstructure that is localized over small regions of the TlO surface has been characterized in the type-1 crystals. These results demonstrate that single crystals of the same average structure and composition can exhibit substantial differences in the local-structure electronic states and superconducting properties.

Original languageEnglish
Pages (from-to)987-992
Number of pages6
JournalPhysical Review B
Volume45
Issue number2
DOIs
Publication statusPublished - 1992 Jan 1

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Crystal chemistry
Scanning tunneling microscopy
Electronic properties
Superconducting materials
scanning tunneling microscopy
Spectroscopy
chemistry
Crystals
Scanning
electronics
spectroscopy
crystals
scanning
inhomogeneity
Single crystals
X rays
x ray fluorescence
single crystals
Electronic states
Magnetic susceptibility

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Relationship between crystal chemistry and the local structure and electronic properties of Tl2Ba2Ca2Cu3O10 superconductors determined by scanning tunneling microscopy and spectroscopy. / Zhang, Zhe; Chen, Chia Chun; Lieber, Charles M.; Morosin, Bruno; Ginley, David S.; Venturini, Eugene L.

In: Physical Review B, Vol. 45, No. 2, 01.01.1992, p. 987-992.

Research output: Contribution to journalArticle

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