Superconductivity in CuxIrTe2driven by interlayer hybridization

Abstract

The change in the electronic structure of layered CuxIrTe2 has been characterized by transport and spectroscopic measurements, combined with first-principles calculations. The Cu-intercalation suppresses the monoclinic distortion, giving rise to the stabilization of the trigonal phase with superconductivity. Thermopower and Hall resistivity measurements suggest the multiband nature with hole and electron carriers for this system, which is masked by the predominance of the hole carriers enhanced by the interlayer hybridization in the trigonal phase. Rather than the instability of Ir d band, a subtle balance between the interlayer and intralayer Te-Te hybridizations is proposed as a main factor dominating the structural transition and the superconductivity.

Suppression of Structural Phase Transition in IrTe2by Isovalent Rh Doping

“…Interestingly, superconductivity emerges at 3.1 K when the structural/electronic phase transition is suppressed by doping electrons of IrTe 2 , as demonstrated in Ir 1Àx Pt x Te 2 , 1) Ir 1Àx Pd x Te 2 , 2) Pd x IrTe 2 , 2) and Cu x IrTe 2 . 3) In this paper, we report that the isovalent Rh doping of IrTe 2 suppresses the structural/electronic phase transition and induces superconductivity at 2.6 K. The doping level of Rh that is necessary for suppressing the transition is three times higher than those of Pt 1) and Pd. 2) Ir 1Àx Rh x Te 2 might provide us with a unique opportunity to study the origin of the structural/electronic phase transition in IrTe 2 .…”

“…MðT Þ exhibits a hysteretic jump at the first-order structural/ electronic phase transition from which we determined the transition temperature T s , as reported previously. [1][2][3][4] T s decreases with increasing x and disappears at x > 0:10. Superconductivity emerges simultaneously.…”

“…2,3) IrTe 2 crystallizes in a trigonal CdI 2 -type structure with the space group P " 3m1 (No. 164).…”

Pressure-Induced Superconductivity in Mineral Calaverite AuTe2

“…[1][2][3] IrTe 2 also shows superconductivity when its structural phase transition from a high-temperature trigonal structure to a low-temperature monoclinic structure is suppressed by the substitution of Pt for Ir, Cu-intercalation, and so on. [4][5][6][7] Since this structural phase transition is characterized by the formation of Ir-Ir bonds along the b-axis, this superconductivity can be interpreted by bond-breaking-induced superconductivity. Moreover, it has recently been found that the making and breaking of dimers or bonds change the electronic state markedly and induce superconductivity or magnetic order in several compounds.…”

Nanoscale Superconducting Honeycomb Charge Order in IrTe2

“…Upon doping, the stripe charge ordering is suppressed and the superconductivity emerges, suggesting a quantum critical behavior [27][28][29][30][31] . The driving force of the transition into the stripe orders is not fully understood yet but the CDW nature was ruled out [32][33][34] .…”