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Superconductivity Induced by Bond Breaking in the Triangular Lattice of IrTe 2

2012; Physical Society of Japan; Volume: 81; Issue: 5 Linguagem: Inglês

10.1143/jpsj.81.053701

1347-4073

Sunseng Pyon, K. Kudo, M. Nohara,

Rare-earth and actinide compounds

IrTe 2 , a layered compound with a triangular iridium lattice, exhibits a structural phase transition at approximately 250 K. This transition is characterized by the formation of Ir–Ir bonds along the b -axis. We found that the breaking of Ir–Ir bonds that occurs in Ir 1- x Pt x Te 2 results in the appearance of a structural critical point in the T = 0 limit at x c ≃0.035. Although both IrTe 2 and PtTe 2 are paramagnetic metals, superconductivity at T c = 3.1 K is induced by the bond breaking in a narrow range of x ≥ x c in Ir 1- x Pt x Te 2 . This result indicates that structural fluctuations can be involved in the emergence of superconductivity.