Localized holes in superconducting lanthanum cuprate

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.R712· OSTI ID:573826

Hammel, P C ^[1]; Statt, B W ^[2]; Martin, R L ^[1]; Chou, F C; Johnston, D C ^[3]; Cheong, S ^[4]

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1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
2. Department of Physics, University of Toronto, Toronto, M5S 1A7 (CANADA)
3. Ames Laboratory--USDOE, and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
4. Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974 (United States)

Copper NQR spectra demonstrate the existence of a second, anomalous copper site in lanthanum cuprate whose character is independent of the method of doping. We present a systematic NMR/NQR study of La{sub 2}CuO{sub 4+{delta}} for a range of {delta}, which demonstrates that the density of such sites increases with {delta}. Analysis of our results and of published data from La{sub 2{minus}x}Sr{sub x}CuO{sub 4} indicate that a substantial fraction of the doped holes in these materials localize in CuO{sub 6} octahedra adjacent to the out-of-plane dopants, and that the anomalous sites are those neighboring a site occupied by such a pinned hole. Thus, superconductivity occurs in a CuO{sub 2} plane containing many localized holes. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 573826
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER
COPPER OXIDES
CRYSTAL DOPING
HIGH-TC SUPERCONDUCTORS
HOLES
LANTHANUM OXIDES
MAGNETIC FLUX
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEAR QUADRUPOLE RESONANCE
STRONTIUM OXIDES
SUPERCONDUCTIVITY