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William K. Ham

Lawrence Livermore National Laboratory

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Publication

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Science | 1987

Oxygen Isotope Effect in High-Temperature Oxide Superconductors

Hans-Conrad zur Loye; Kevin J. Leary; Steven W. Keller; William K. Ham; Tanya A. Faltens; James N. Michaels; Angelica M. Stacy

The effect of oxygen isotope substitution on the superconducting transition temperature, Tc, has been measured for BaBi0.25Pb0.75O3 (Tc, ≈ 11 K) and Lal1.85 Ca0.15CuO4 (Tc ≈ 20 K), and is compared to the shifts observed for La1.85Sr0.15CuO4 (Tc ≈ 37 K) and YBa2Cu3O7 (Tc ≈ 92 K). For all four materials, the transition temperature is shifted to lower temperature upon substitution of oxygen-18 for oxygen-16. The observed shifts demonstrate that phonons are involved in the electron-pairing mechanism in these oxide superconductors.

Physical Review Letters | 1987

Observation of an Isotope Shift in the Superconducting Transition Temperature of La 1.85 Sr 0.15 CuO 4

Tanya A Faltens; William K. Ham; Steven W. Keller; Kevin J. Leary; James N. Michaels; Angelica M. Stacy; Hans-Conrad zur Loye; Donald E. Morris; Troy W. Barbee; Marvin L. Cohen; Cohen S Hoen; Alex Zettl

Physical Review Letters | 1987

Observation of an oxygen isotope effect in YBa/sub 2/Cu/sub 3/O/sub 7/

Kevin J. Leary; H. zur Loye; Steven W. Keller; Tanya A. Faltens; William K. Ham; James N. Michaels; Angelica M. Stacy

Physical Review Letters | 1987

Observation of an oxygen isotope shift in the superconducting transition temperature of La/sub 1. 85/Sr/sub 0. 15/CuO/sub 4/

Tanya A. Faltens; William K. Ham; Steven W. Keller; Kevin J. Leary; James N. Michaels; Angelica M. Stacy; H. zur Loye; Donald E. Morris; Troy W. Barbee; L. C. Bourne

Journal of the American Chemical Society | 1988

Low-temperature synthesis of superconducting La2-xMxCuO4: direct precipitation from NaOH/KOH melts

William K. Ham; Gary F. Holland; Angelica M. Stacy

Physical Review B | 1987

Elasticity studies of La2-xSrxCuO4.

L. C. Bourne; Alex Zettl; Kee-Joo Chang; Marvin L. Cohen; Angelica M. Stacy; William K. Ham

Journal of the American Chemical Society | 1987

High Temperature Superconductivity in Y-Ba-Cu-O: Identification of a Copper-rich Superconducting Phase

Angelica M. Stacy; John V. Badding; Margret J. Gesselbracht; William K. Ham; Gary F. Holland; Renata L. Hoskins; Steven W. Keller; Clark F. Millikan; Hans-Conrad zur Loye

Journal of Materials Research | 1989

Partial substitution of 18 O in YBa 2 Cu 3 O 7 : Investigations of inhomogeneities and their effect on T c

William K. Ham; Steven W. Keller; James N. Michaels; Angelica M. Stacy; Dimitry Krillov; David T. Hodul; Ronald H. Fleming

Archive | 1989

Partial substitution of ¹â¸O in YBaâCuâOâ: Investigations of inhomogeneities and their effect on /ital T//sub c/

William K. Ham; Steven W. Keller; James N. Michaels; Angelica M. Stacy; D. Krillov; David T. Hodul; R. H. Fleming

Physical Review B | 1987

Elasticity studies of La_{2-x}Sr_{x}CuO_{4}

L. C. Bourne; Alex Zettl; Kee-Joo Chang; Marvin L. Cohen; Angelica M. Stacy; William K. Ham

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Angelica M. Stacy

University of California

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Steven W. Keller

University of Missouri

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James N. Michaels

Lawrence Livermore National Laboratory

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Alex Zettl

University of California

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Kevin J. Leary

University of California

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Tanya A. Faltens

Lawrence Livermore National Laboratory

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Hans-Conrad zur Loye

University of South Carolina

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L. C. Bourne

University of California

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Marvin L. Cohen

University of California

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Kee-Joo Chang

KAIST

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