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- W2049941545 abstract "We have investigated oxygen-isotope effects on the effective mass of carriers ${mathit{m}}^{mathrm{*}}$ and carrier concentration ${mathit{n}}_{mathit{s}}$ in fine-grained ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{mathit{y}}$ (yensuremath{approxeq}6.94) using measurements of onset magnetizations in Meissner and mixed states. We find a large negative oxygen-isotope effect on ${mathit{m}}^{mathrm{*}}$ with an exponent ${mathrm{ensuremath{alpha}}}_{mathrm{O}{mathit{m}}^{mathrm{*}}}$=-d ln(m*)/d ln${mathit{M}}_{mathrm{O}}$=-0.61ifmmodepmelsetextpmfi{}0.09, and a small oxygen-isotope effect on ${mathit{n}}_{mathit{s}}$ with an exponent ${mathrm{ensuremath{alpha}}}_{mathrm{O}mathit{n}}$=-d ln(${mathit{n}}_{mathit{s}}$)/d ln${mathit{M}}_{mathrm{O}}$=0ifmmodepmelsetextpmfi{}0.13. We also observe a small positive oxygen-isotope effect on ${mathit{T}}_{mathit{c}}$ with an exponent ${mathrm{ensuremath{alpha}}}_{mathrm{O}}$=-d ln${mathit{T}}_{mathit{c}}$/d ln${mathit{M}}_{mathrm{O}}$=0.028ifmmodepmelsetextpmfi{}0.002. The large oxygen-isotope effect on ${mathit{m}}^{mathrm{*}}$ can be explained as due to the breakdown of the Migdal approximation and/or strong anharmonicity of phonon modes." @default.
- W2049941545 created "2016-06-24" @default.
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- W2049941545 date "1995-06-01" @default.
- W2049941545 modified "2023-09-25" @default.
- W2049941545 title "Observation of a possible oxygen isotope effect on the effective mass of carriers inYBa2Cu3O6.94" @default.
- W2049941545 doi "https://doi.org/10.1103/physrevb.51.16487" @default.
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