Multiple phase transitions in Ce(Rh,Ir,Co)In5
2002; Elsevier BV; Volume: 312-313; Linguagem: Inglês
10.1016/s0921-4526(01)01281-9
ISSN1873-2135
AutoresP. G. Pagliuso, R. Movshovich, A. Bianchi, M. Nicklas, N. O. Moreno, J. D. Thompson, M. F. Hundley, J. L. Sarrao, Z. Fisk,
Tópico(s)Magnetic and transport properties of perovskites and related materials
ResumoMagnetic susceptibility, electrical resistivity and heat capacity data for single crystals of Ce(Rh,Ir)1−x(Co,Ir)xIn5 (0⩽x⩽1) have allowed us to construct a detailed phase diagram for this new family of heavy-fermion superconductors. CeRh1−xIrxIn5 displays superconductivity(SC) (Tc≲1K) over a wide range of composition, which develops out of and coexists (0.30≲x≲0.5) with a magnetically ordered state, with TN∼4K. For CeCo1−xRhxIn5, the superconducting state (Tc∼2.3K for x=0) becomes a magnetic state (TN∼4K, for x=1) with two phase transitions observed for 0.40≲x≲0.25. CeCo1−xIrxIn5 also shows two transitions for 0.30≲x≲0.75. For those alloys in which SC is found, a roughly linear relationship between Tc and the lattice parameter ratio c/a, was found, with composition as the implicit parameter. The interplay between magnetism and SC for CeRh1−x(Ir,Co)xIn5 and the possibility of two distinct superconducting states in CeCo1−xIrxIn5 are discussed.
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