Muon-spin-rotation studies of the temperature dependence of the magnetic penetration depth in the YBa2Cu3Ox family and related compounds

P. Zimmermann*, H. Keller, S. L. Lee, I. M. Savić, M. Warden, D. Zech, R. Cubitt, E. M. Forgan, E. Kaldis, J. Karpinski, C. Krüger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)

Abstract

A systematic muon-spin-rotation (+SR) study is presented of the temperature dependence of the London penetration depth in sintered powder samples of the YBa2Cu3Ox system and related compounds. The in-plane penetration depth ab is estimated from the SR depolarization rate of Bi2Sr2CaCu2O8, YBa2Cu4O8, and a series of samples of the YBa2Cu3Ox family, respectively. It is found that not only the low-temperature value ab(0), but also the temperature behavior ab(T) is specific to each compound. The form of ab(T) can be well characterized by a simple power law. In particular, the YBa2Cu3Ox family shows a systematic variation of the form of ab(T) with the oxygen content x which points to a varying coupling strength, whereas ab(0) as a function of x suggests a positive charge transfer into the CuO2 planes with increasing oxygen doping. Furthermore, our data is consistent with an empirical ansatz which has been proposed in the framework of a Bose-gas picture of high-temperature superconductivity. As a consequence, the pressure and the isotope coefficients can be extracted from the SR depolarization rate and compared to direct measurements of these quantities, showing good agreement. Moreover, in the Bose-gas picture the variation of ab(T) in the YBa2Cu3Ox family may be interpreted as a crossover from a dense (high-Tc) to a dilute (low-Tc) system of weakly interacting local pairs.

Original languageEnglish
Pages (from-to)541-552
Number of pages12
JournalPhysical Review B
Volume52
Issue number1
DOIs
Publication statusPublished - 1995

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