Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-12-23
Journal of Physics. Condensed Matter, v. 21, p. 046007, 2009.
Physics
Condensed Matter
Strongly Correlated Electrons
10 figures, to appear in J. Phys.:condens. Matter, 21 (2009) in press
Scientific paper
10.1088/0953-8984/21/4/046007
A new quaternary intermetallic borocarbide TmCo2B2C has been synthesized via a rapid-quench of an arc-melted ingot. Elemental and powder-diffraction analyses established its correct stoichiometry and single-phase character. The crystal structure is isomorphous to that of TmNi2B2C(I4/mmm) and is stable over the studied temperature range. Above 7 K, the paramagnetic state follows the modified Curie-Weiss behavior (X=C/(T-theta)+X0 wherein X0=0.008(1) emu/mole and the temperature-dependent term reflecting the paramagnetism of the Tm subsystem: ueff=7.6(2) uB [in agreement with the expected value for a free Tm3+ ion] and theta = -4.5(3) K. Long range ferromagnetic order of the Tm sublattice is observed to develop around ~1 K. No superconductivity is detected in TmCo2B2C down to 20 mK, a feature which is consistent with the general trend in the RCo2B2C series. Finally, the influence of the rapid-quench process on the magnetism (and superconductivity) of TmNi2B2C will be discussed and compared to that of TmCo2B2C.
Chaves F. A. B.
El-Massalami Mohammed
Freitas Rafael S.
Huang Qingzhen
Lynn Jacob W.
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