Article

Pressure dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>and charge transfer in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>(6.35≤<i>x</i>≤7) single crystals

C. C. AlmasanDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093Seung Ho HanDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093B. W. LeeDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093L. M. PauliusDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093M. B. MapleDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093B. W. VealDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093J.W. DowneyDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093A. P. PaulikasDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093Z. FiskDepartment of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093J. E. SchirberLos Alamos National Laboratory, Los Alamos, New Mexico 87545

1992lv

ABI

Abstract

The superconducting critical temperature ${\mathit{T}}_{\mathit{c}}$ of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{\mathit{x}}$ single crystals (6.35\ensuremath{\lesssim}x\ensuremath{\lesssim}7) has been measured resistively as a function of pressure P (0\ensuremath{\le}P\ensuremath{\lesssim}20 kbar). The initial rate ${\mathit{dT}}_{\mathit{c}}$/dP exhibits three distinct regimes, a narrow plateau near x\ensuremath{\approxeq}7 with ${\mathit{dT}}_{\mathit{c}}$/dP\ensuremath{\approxeq}0.04 K/kbar, a plateau in the range 6.4\ensuremath{\lesssim}x\ensuremath{\lesssim}6.8, where ${\mathit{dT}}_{\mathit{c}}$/dP\ensuremath{\approxeq}0.43 K/kbar, and a maximum value \ensuremath{\sim}0.8 K/kbar at x\ensuremath{\approxeq}6.35. An analysis of the ${\mathit{T}}_{\mathit{c}}$(x,P) data using a phenomenological model yields a pronounced peak near x=6.8 in d\ensuremath{\Delta}${\mathit{n}}_{\mathit{h}}$(x)/dP, where \ensuremath{\Delta}${\mathit{n}}_{\mathit{h}}$(x) is the change in the hole density in the ${\mathrm{CuO}}_{2}$ planes relative to the value corresponding to the fully oxygenated sample.

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Identifiers

DOI: 10.1103/physrevlett.69.680

Citations and references

Cited by 30 references

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