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Transport and microwave study of superconducting and magneticRuSr2EuCu2OPožek1, Dulčić2, Paar3 et al. 2001Phys. Rev. B260220View full textAdd to dashboardCite

“…This initial increase is followed by a much slower rise at higher magnetic fields. Similar behavior is also seen in weak-linked ceramic samples of other 9 high temperature superconducting cuprates [20,23,24]. Below the superconducting onset temperature (~32 K) the superconducting order parameter is formed first in the individual grains.…”

“…There have been a number of recent studies reporting the coexistence of superconductivity and magnetic order in RuSr 2 R 2 Cu 2 O 10 and RuSr 2 RCu 2 O 8 where R=Gd or Eu [1][2][3][4][5][6][7][8][9][10][11][12]. These superconductors were originally synthesized by Bauernfeind et al [13,14].…”

“…Recent magnetization and muon spin rotation studies have shown that there exists a magnetic ordering transition at a temperature much greater than the superconducting transition temperature, T c [3,4]. Some studies have been interpreted in terms of ferromagnetic order arising from the Ru moment in the RuO 2 layers [3][4][5][6][7][8][9][10]12]. This generated considerable interest because ferromagnetic order and superconductivity are competing processes and can only coexist via some accommodation, for example by a spatial modulation of the respective order parameters or the formation of a spontaneous vortex phase.…”

Two-dimensional frustrated magnetic state in superconductingRuSr2Eu1.5Ce0.5Cu

“…Some features of this complex magnetic system include competitive antiferromagnetic (AFM) and ferromagnetic (FM) interactions, 1,2 itinerant magnetism of the Ru sub-lattice, 3 spin-flop transitions, 4 deviations from the Curie-Weiss behavior well above the magnetic transition temperature, 5 different states of valence for the Ru ions with possible ferrimagnetic order, 1 super-exchange interaction of the Dzyaloshinsky-Moriya type, 6 magnetic phase separation of nanosized particles, [7][8][9] and a dynamic response typical of a spin-glass state. 10,11 The details of the magnetic structure are of primary interest for the onset of the superconducting (SC) state at temperatures considerably below the magnetic transition.…”

Oxygen nuclear magnetic resonance study of RuSr2EuCu2O8

“…Some reports have concluded that the magnetic order in RuSr 2 RCu 2 O 8 is ferromagnetic in the RuO 2 layers [3][4][5][6]9,10,13] in which case there should be a competition between the superconducting and magnetic order parameters possibly resulting in a spontaneous vortex phase or a spatial modulation of the respective order parameters [7]. However, powder neutron diffraction studies on RuSr 2 GdCu 2 O 8 and RuSr 2 YCu 2 O 8 showed that the low-field magnetic order is predominately antiferromagnetic (~1 µ B /Ru) and there is a spin-flop transition that gradually occurs for magnetic fields greater than 0.4 T [11,12].…”