The Superconducting and Magnetic States in RuSr_2GdCu_2O_8, Based on the Magnetic, Transport and Magneto-Caloric Characteristics

• Authors: P. Klamut , T. Plackowski
• Languages of publication: EN

Abstracts

EN

The article discusses selected properties of the non- and superconducting polycrystalline samples of RuSr_2GdCu_2O_8 and comments on the consequences of introducing insignificant sub-stoichiometry of Ru into the nominal formula. The magneto-resistive and the magnetic characteristics are interpreted in favour of the formation of intrinsically inhomogeneous superconducting phase, which seems stabilized along with the structural modifications enhanced with the modification of starting stoichiometry. The specific heat data reveals the small shift of the temperature of magnetic ordering T_{m}, which may suggest dilution of the magnetic sublattice of the Ru moments. The measurements of the magnetic field dependences of the isothermal magnetocaloric coefficient M_{T} reveal no gain in the system magnetic entropy in a broad range of accessed fields and temperature. Whereas the multi-component character of the compound's magnetsm precludes from concluding on the magnetic ground state, the maximum in M_T (H), which occurs at comparably weak magnetic field for temperatures in a vicinity of T_{m} may reflect dominance of the ferromagnetic type interactions with a constrained correlation range. The literature explored models for the Ru magnetic ordering and also possible phase separation are brought into the discussion.

Keywords

EN

74.72.-h; 75.30.-m; 74.62.Bf; 74.25.F-; 75.30.Sg

Discipline

• 74.72.-h: Cuprate superconductors
• 74.62.Bf: Effects of material synthesis, crystal structure, and chemical composition(for methods of materials synthesis, see 81.20.-n)
• 75.30.Sg: Magnetocaloric effect, magnetic cooling(for cryogenics, see 07.20.Mc)
• 74.25.F-: Transport properties
• 75.30.-m: Intrinsic properties of magnetically ordered materials(for critical point effects, see 75.40.-s; for magnetotransport phenomena, see 75.47.-m)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 2
• Pages: 254-260

Dates

published

2010-08

Contributors

author

P. Klamut

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P Nr 1410, 50-950 Wrocław 2, Poland

author

T. Plackowski

• Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P Nr 1410, 50-950 Wrocław 2, Poland

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Identifiers

DOI

10.12693/APhysPolA.118.254