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Nature of the Pseudogap in High-T c Cuprates: Analysis of the Bulk Magnetic Susceptibility of La2−x Sr x Cu1−y Zn y O4

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Abstract

The nature of the pseudogap in the quasiparticle spectral density in high-T c cuprates is a matter of intense debate. In this study we have investigated the effects of Zn substitution on the uniform (\(\boldsymbol{q}=0\), where \(\boldsymbol{q}\) is the wave vector) magnetic susceptibility, χ(T), of La2−x Sr x Cu1−y Zn y O4 sintered samples with different hole concentrations, p(≡x), over a wide range of Zn contents (y). Non-magnetic Zn suppressed T c most effectively and enhanced χ(T) systematically at low temperatures. We have extracted the characteristic pseudogap energy scale, ε g, from the analysis of χ(T) data. Unlike T c,ε g was found to be fairly insensitive to the level of Zn substitution, even when T c was completely suppressed by Zn. The Zn-induced Curie-like enhancement of the χ(T) was also found to be closely related to the PG energy scale. We discuss the possible implications of these findings in this paper.

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Authors and Affiliations

  1. Department of Physics, Rajshahi University, Rajshahi, 6205, Bangladesh

    R. S. Islam, M. M. Hasan & S. H. Naqib

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  1. R. S. Islam
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  2. M. M. Hasan
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  3. S. H. Naqib
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Correspondence to S. H. Naqib.

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Islam, R.S., Hasan, M.M. & Naqib, S.H. Nature of the Pseudogap in High-T c Cuprates: Analysis of the Bulk Magnetic Susceptibility of La2−x Sr x Cu1−y Zn y O4 . J Supercond Nov Magn 23, 1569–1574 (2010). https://doi.org/10.1007/s10948-010-0814-9

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  • DOI: https://doi.org/10.1007/s10948-010-0814-9

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