Article

Constant effective mass across the phase diagram of high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math>cuprates

Willie J. PadillaDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USAY.S. LeeDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USAM. DummDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USAG. BlumbergDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USAShimpei OnoDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USAKouji SegawaDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USASeiki KomiyaDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USAYoichi AndoDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USAD. N. BasovDepartment of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA

2005lv

ABI

Abstract

We investigate the hole dynamics in two prototypical high temperature superconducting systems: ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ and $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$, using a combination of dc transport and infrared spectroscopy. By exploring the effective spectral weight obtained with optics in conjunction with dc Hall results, we find that the transition to the Mott insulating state in these systems is of the ``vanishing carrier number'' type since we observe no substantial enhancement of the mass as one proceeds to undoped phases. Further, the effective mass remains constant across the entire underdoped regime of the phase diagram. We discuss the implications of these results for the understanding of both transport phenomena and pairing mechanism in high-${T}_{c}$ systems.

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Identifiers

DOI: 10.1103/physrevb.72.060511

Citations and references

Cited by 20 references

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