Quantum criticality and disorder in the antiferromagnetic critical point of NiS$_{2}$ pyrite

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dc.creatorTakeshita, N.
dc.creatorTakashima, S.
dc.creatorTerakura, C.
dc.creatorNishikubo, H.
dc.creatorMiyasaka, S.
dc.creatorNohara, M.
dc.creatorTokura, Y.
dc.creatorTakagi, H.
dc.date2007-04-04
dc.date.accessioned2026-07-07T07:54:33Z
dc.date.available2026-07-07T07:54:33Z
dc.descriptionA quantum critical point (QCP) between the antiferromagnetic and the paramagnetic phases was realized by applying a hydrostatic pressure of ~ 7 GPa on single crystals of NiS_{2} pyrite with a low residual resistivity, rho_{0}, of 0.5 mu-Omega-cm. We found that the critical behavior of the resistivity, rho, in this clean system contrasts sharply with those observed in its disordered analogue, NiS_{2-x}Se_{x} solid-solution, demonstrating the unexpectedly drastic effect of disorder on the quantum criticality. Over a whole paramagnetic region investigated up to P = 9 GPa, a crossover temperature, defined as the onset of T^{2} dependence of rho, an indication of Fermi liquid, was suppressed to a substantially low temperature T sim 2 K and, instead, a non Fermi liquid behavior of rho, T^{3/2}-dependence, robustly showed up.
dc.description4 pages
dc.identifierhttps://arxiv.org/abs/0704.0591
dc.identifierhttp://arxiv.org/abs/0704.0591
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/126653
dc.subjectStrongly Correlated Electrons
dc.titleQuantum criticality and disorder in the antiferromagnetic critical point of NiS$_{2}$ pyrite
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