2002/04/03 by H. Shibata, Hiroyuki Shibata · 6 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Nuclear physics #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Plasma #Quantum mechanics #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.65.180507
published in Physical review. B, Condensed matter 65(18) (American Physical Society) · to appear in Phys. Rev.B Rapid Comm
arxiv created 2002/04/03 · openalex publication_date 2002/04/26 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Josephson plasma in RuSr2GdCu2O8, Ru_1\ensuremath-xSr2GdCu2+xO8 (x=0.3), and RuSr2Eu_2\ensuremath-xCexCu2O10 (x=0.5) compounds is investigated by the sphere resonance method. The Josephson plasma is observed in a low-frequency region (around 8.5 cm^\ensuremath-1 at T\ensuremath≪Tc) for ferromagnetic RuSr2GdCu2O8, while it increases to 35 cm^\ensuremath-1 for nonferromagnetic Ru_1\ensuremath-xSr2GdCu2+xO8 (x=0.3), which represents a large reduction in the Josephson coupling at ferromagnetic RuO2 block layers. The temperature dependence of the plasma does not shift to zero frequency (i.e., jc=0) at low temperatures, indicating that there is no transition from the zero phase to the \ensuremathπ phase in these compounds. The temperature dependence and the oscillator strength of the peak are different from those of other nonmagnetic cuprates, and the origins of these anomalies are discussed.