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The effect of chemical pressure in rutheno-cuprates

Nikseresht, N ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physc.2010.01.019
  3. Abstract:
  4. We have studied the effect of negative chemical pressure in the RuGd 1.5(Ce 0.5-xPr x)Sr 2Cu 2O 10-δ with Pr content of 0.0 ≤ x ≤ 0.2. This is also investigated using the bond length results obtained from the Rietveld refinement analysis. The c parameter and cell volume increase with x for 0.0 ≤ x ≤ 0.15. The width of the resistivity transition also increases with Pr concentration, indicating higher inhomogeneity and oxygen deficiency. The difference in the ionic valences of Pr 3+,4+ and Ce 4+ causing different hole doping, the difference in the ionic radii, and oxygen stoichiometry affect the superconducting transition. The magnetoresistance shows a cusp around 135 K which lies between the antiferromagnetic and ferromagnetic transition temperatures, which is probably due to the presence of a spin glass region. There exist two magnetic transition temperatures for 0.0 ≤ x ≤ 0.2 which respectively change from T M = 155 K to 144 K and from T irr = 115 K to 70 K. The magnetization versus applied magnetic field isotherms at 77 K and 300 K show that the remanent magnetization and coercivity are lower for samples with higher Pr content
  5. Keywords:
  6. Antiferromagnetism ; Magnetic properties ; Rutheno-cuprates ; Superconductors ; Antiferromagnetic and ferromagnetic transition ; Applied magnetic fields ; C parameter ; Cell volume ; Chemical pressures ; Coercivities ; Effect of chemicals ; Hole-doping ; Inhomogeneities ; Ionic radius ; Ionic valence ; Magnetic transition temperature ; Oxygen deficiency ; Oxygen stoichiometry ; Remanent magnetization ; Superconducting transitions ; Pressure effects ; Bond length ; Cerium ; Cerium compounds ; Copper compounds ; Electric resistance ; Glass transition ; Lanthanum compounds ; Magnetic field effects ; Magnetic properties ; Magnetoresistance ; Oxygen ; Rietveld analysis ; Rietveld method ; Rietveld refinement ; Spin glass ; Stoichiometry ; Superconducting materials ; Superconducting transition temperature ; Superconductivity ; Pressure effects
  7. Source: Physica C: Superconductivity and its Applications ; Volume 470, Issue 4 , 2010 , Pages 285-290 ; 09214534 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0921453410000341