High pressure high temperature synthesis and magnetization of magneto-superconducting RuSr{sub 2}(LnCe{sub 2})Cu{sub 2}O{sub 12.25} (Ru-1232) compounds (Ln=Y and Dy)

Journal Article · Sun May 15 00:00:00 EDT 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1853811· OSTI ID:20709690

Awana, V P.S.; Kishan, H; Kawashima, T; Takayama-Muromachi, E; Cardoso, C A ^[1]

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1. National Physical Laboratory K.S. Krishnan Marg, New Delhi 110012 (India)

RuSr{sub 2}(LnCe{sub 2})Cu{sub 2}O{sub 12.25} (Ru-1232) compounds with Ln=Y and Dy being synthesized by high pressure high temperature (6 GPa, 1200 deg. C) solid state synthesis route crystallize in space group P4/mmm in near single phase form with small quantities of SrRuO{sub 3} and RuSr{sub 2}(RE{sub 1.5}Ce{sub 0.5})Cu{sub 2}O{sub 10} (Ru-1222). Both samples exhibit magnetic transitions (T{sub mag.}) at {approx}90 K with significant branching of zero-field-cooled (ZFC) and field-cooled (FC) magnetization and a sharp cusp in ZFC at {approx}70 K, followed by superconducting transitions at {approx}30 K. Both compounds show typical ferromagnetic hysteresis loops in magnetic moment (M) versus field (H) magnetization right up to T{sub mag.} i.e., <90 K. To our knowledge these are the first successfully synthesized Ru-1232 compounds in near single phase with lanthanides including Y and Dy. The results are compared with widely reported Gd/Ru-1222 and Ru-1212 (RuSr{sub 2}GdCu{sub 2}O{sub 8}) compounds. In particular, it seems that the Ru moments magnetic ordering temperature (T{sub mag.}) scales in the c-direction distance between magnetic RuO{sub 6} octahedras in Ru-1212/1222 or 1232 systems.

• OSTI ID: 20709690
• Journal Information: Journal of Applied Physics, Vol. 97, Issue 10; Conference: 49. annual conference on magnetism and magnetic materials, Jacksonville, FL (United States), 7-11 Nov 2004; Other Information: DOI: 10.1063/1.1853811; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM COMPOUNDS
DYSPROSIUM COMPOUNDS
FERROMAGNETIC MATERIALS
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
RUTHENIUM COMPOUNDS
SPACE GROUPS
STRONTIUM COMPOUNDS
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 1000-4000 K
YTTRIUM COMPOUNDS