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Phys. Rev. B 72, 060511(R) (2005) [4 pages]

Constant effective mass across the phase diagram of high-Tc cuprates

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W. J. Padilla*, Y. S. Lee, and M. Dumm†
Department of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA

G. Blumberg
Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA

S. Ono, Kouji Segawa, Seiki Komiya, and Yoichi Ando
Central Research Institute of Electric Power Industry, Komae, Tokyo 201-8511, Japan

D. N. Basov
Department of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA

Received 5 July 2005; published 25 August 2005

We investigate the hole dynamics in two prototypical high temperature superconducting systems: La2−xSrxCuO4 and YBa2Cu3Oy, 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-Tc systems.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.060511
DOI:
10.1103/PhysRevB.72.060511
PACS:
74.25.Gz, 74.25.Kc, 74.72.Dn

*Present address: Los Alamos National Laboratory, MS G756, MST-CINT, Los Alamos, NM 87545. Electronic address: willie@lanl.gov

†Present address: 1. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany.

 
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