Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-10-05
Phys. Rev. B 77 (2008) 115135
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages
Scientific paper
We report low-temperature and high-pressure measurements of the electrical resistivity \rho(T) of the antiferromagnetic compound NiS_2 in its high-pressure metallic state. The form of \rho(T) suggests that metallic antiferromagnetism in NiS_2 is quenched at a critical pressure p_c=76+-5 kbar. Near p_c the temperature variation of \rho(T) is similar to that observed in NiS_{2-x}Se_x near the critical composition x=1 where the Neel temperature vanishes at ambient pressure. In both cases \rho(T) varies approximately as T^{1.5} over a wide range below 100 K. However, on closer analysis the resistivity exponent in NiS_2 exhibits an undulating variation with temperature not seen in NiSSe (x=1). This difference in behaviour may be due to the effects of spin-fluctuation scattering of charge carriers on cold and hot spots of the Fermi surface in the presence of quenched disorder, which is higher in NiSSe than in stoichiometric NiS_2.
Braithwaite Daniel
Flouquet Jacques
Knebel Georg
Lonzarich Gilbert G.
Niklowitz P. G.
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