Magnetism and superconductivity in La1.875Ba0.125-ySryCuO4+δ and La1.6-yNd0.4SryCuO4

A. Lappas, L. Cristofolini, Kosmas Prassides, K. Vavekis, A. Amato, F. N. Gygax, M. Pinkpank, A. Schenck

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6 Citations (Scopus)

Abstract

μ+SR and neutron diffraction measurements show that at low temperatures in La1.875-Ba0.125CuO4, there is phase separation into a long range ordered magnetic component of SDW-like nature, identified with the LTT phase and a superconducting component, identified with the LTO phase. Partial substitution of Ba by Sr at a fixed doping level of 1/8 leads to gradual decrease of the magnetic freezing temperature, accompanied by a decrease in the fraction of the magnetic component. The La1.875Ba0.025Sr0.100CuO4 composition exhibits freezing of the Cu electronic moments into a disordered arrangement. Excess interstitial oxygen leads to a rapid recovery of superconductivity and a marked depression of the magnetic volume fraction. Study of the LTT phase - after stabilisation with partial substitution of La by Nd - away from the 1/8 doping level, reveals no evidence of long range magnetic ordering with magnetic fluctuations surviving down to 3 K.

Original languageEnglish
Pages (from-to)101-106
Number of pages6
JournalHyperfine Interactions
Volume105
Issue number1-4
Publication statusPublished - 1997 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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