Electronic Raman scattering on out-of-plane disordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>: How the pseudogap affects the superconducting Raman response
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説明
We report Raman scattering measurements on ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ single crystals with a different degree of out-of-plane disorder to examine the effect of ${T}_{c}$ change on the the electronic Raman response at the optimal doping level. The ${B}_{1g}$ peak energies for lower ${T}_{c}$ disordered samples are essentially independent of ${T}_{c}$. However, a further increase of ${T}_{c}$ by minimizing the degree of out-of-plane disorder leads to a high-energy shift of the ${B}_{1g}$ peak. Interestingly, abrupt change of the ${B}_{1g}$ peak energy occurs when the the superconducting gap energy exceeds the pseudogap energy, which results in the recovery of superconductivity-dominated Raman response in ${B}_{1g}$ symmetry. It suggests that these anomalous properties of the antinodal electrons are a consequence of the unconventional superconducting state of the cuprates where superconductivity coexists with the pseudogap in the ground state.
収録刊行物
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- Physical Review B
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Physical Review B 91 2015-06-30
American Physical Society (APS)
