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Raman scattering in \RmYBa$_2$Cu$_4$O$_8$ and PrBa$_2$Cu$_4$O$_8$: Indications of pseudogap effects in non-superconducting \RmPrBa$_2$Cu$_4$O$_8$
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2000 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 61, 7049-7054 p.Article in journal (Refereed) Published
Abstract [en]

By analysis of the Raman spectra of superconducting YBa2Cu4O8 (Y-124), we observe a suppression of low-energy electronic density of states that we link to changes in the linewidth of the Ba-phonon mode. These effects occur at a temperature below 150 K, where also anomalies in resistivity and other physical properties take place. We argue that these changes in the Raman spectra of Y-124 are connected to the opening of a pseudogap. Analogous anomalies in resistivity and the Ba-phonon width in the nonsuperconducting homologue PrBa2Cu4O8 (Pr-124) below 150 K suggest that similar pseudogap effects can occur without a following transition to a superconducting state at a lower temperature.

Place, publisher, year, edition, pages
2000. Vol. 61, 7049-7054 p.
Identifiers
URN: urn:nbn:se:miun:diva-14333DOI: 10.1103/PhysRevB.61.7049OAI: oai:DiVA.org:miun-14333DiVA: diva2:435614
Available from: 2011-08-19 Created: 2011-08-19 Last updated: 2011-11-27Bibliographically approved

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Bäckström, Joakim
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