Resistance anomaly in CuIr2Te4

Nagata, Satoshi; Kijima, Norihito; Ikeda, Shin‐ichi; Matsumoto, Nobuhiro; Endoh, Ryo; Chikazawa, Susumu; Shimono, Isao; Nishihara, H.

doi:10.1016/s0022-3697(98)00281-9

Cited by 15 publications

(10 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At x = 0.50, an anomaly in the temperature dependence of electrical resistivity and magnetization is observed at T≈250 K suggesting the reappearance of the structural transition. [12,13] This doping effect is similar to that in TM x TiSe 2 compounds. [14] TiSe 2 shows a structural phase transition induced by a CDW below ∼200 K. Similar to IrTe 2 , the structural transition is accompanied by distinct anomalies in transport, magnetic and thermodynamic properties.…”

Section: Introductionsupporting

confidence: 70%

“…CuTe is observed as the impurity in polycrystalline samples prepared by conventional solid state reaction of a stoichiometric mixture of Cu, Ir and Te powders following the procedure reported in Ref [12,13]. We also tried to intercalate Cu by long term annealing the mixture of Cu and IrTe 2 below 300 o C. [11] Annealing at 280 o C for a month still doesn't reach a complete intercalation which suggests this is limited by the diffusion kinetics.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Absence of structural transition inM0.5IrTe2(M = Mn, Fe, Co, Ni)

et al. 2013

View full text Add to dashboard Cite

TM -doped IrTe2 (TM =Mn, Fe, Co, Ni) compounds were synthesized by solid state reaction. Single crystal x-ray diffraction experiments indicate that part of the doped TM ions (TM =Fe, Co, and Ni) substitute for Ir, and the rest intercalate into the octahedral interstitial sites located in between IrTe2 layers. Due to the lattice mismatch between MnTe2 and IrTe2, Mn has limited solubility in IrTe2 lattice. The trigonal structure is stable in the whole temperature range 1.80 K≤ T ≤ 300 K for all doped compositions. No long range magnetic order or superconductivity was observed in any doped compositions above 1.80 K. A spin glass behavior below 10 K was observed in Fe-doped IrTe2 from the temperature dependence of magnetization, electrical resistivity, and specific heat. The low temperature specific heat data suggest the electron density of states is enhanced in Feand Co-doped compositions but reduced in Ni-doped IrTe2. With the 3d transition metal doping the trigonal a-lattice parameters increases but the c-lattice parameter decreases. Detailed analysis of the single crystal x-ray diffraction data shows that interlayer Te-Te distance increases despite a reduced c-lattice. The importance of the Te-Te, Te-Ir, and Ir-Ir bonding is discussed.

show abstract

Section: Introductionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Absence of structural transition inM0.5IrTe2(M = Mn, Fe, Co, Ni)

et al. 2013

View full text Add to dashboard Cite

show abstract

“…IrTe 2 crystallizes in the 1T-TaS 2 (or CdI 2 ) type trigonal structure (P -3m1) at room temperature [15]. As in the case for Cu 0.5 IrTe 2 , Cu + ions are expected to be incorporated into the octahedral site in between the Te-Te double layers [16]. With increasing the Cu content x, the a-axis length increases monotonically, reflecting the reduction of the valence of Ir ions (see Fig.…”

mentioning

confidence: 91%

Superconductivity in CuxIrTe2driven by interlayer hybridization

et al. 2013

View full text Add to dashboard Cite

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.

show abstract

“…Recently, some reports suggested that low dimensionality leads to special electronic structures and allows relatively strong fluctuations, which may enhance superconductivity, even though charge-density wave (CDW) sometime competes, especially in the quasi-one-dimensional case. 22 Intrigued by this issue, we recently have systematically studied the properties of CuIr2Te4, which adopts a disordered trigonal structure with space group P3 ̅ m1, 23 and found coexistence of the superconducting (Tc = 2.5 K) and CDW (TCDW = 250 K) in the copper telluride chalcogenide CuIr2Te4. 24 According to our previous calculation study, we find both orbital projected band structure and density of state, the bands near the Fermi energy EF mainly come from Te p and Ir d orbitals, similar to that of CuIr2S4 in spinel structure.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in Ru-doped CuIr2Te4 telluride chalcogenide

et al. 2019

View full text Add to dashboard Cite

Here we report the effect of structural and superconductivity properties on Ru doped CuIr2Te4 telluride chalcogenide. XRD results suggest that the CuIr2-xRuxTe4 maintain the disordered trigonal structure with space group P3 ̅ m1 (No. 164) for x ≤ 0.3. The lattice constants, a and c, both decrease with increasing Ru content. Temperaturedependent resistivity, magnetic susceptibility and specific-heat measurements are performed to characterize the superconducting properties systematically. Our results suggest that the optimal doping level for superconductivity in CuIr2-xRuxTe4 is x = 0.05,where Tc is 2.79 K with the Sommerfeld constant γ of 11.52 mJ mol -1 K -2 and the specific-heat anomaly at the superconducting transition, C/γTc, is approximately 1.51, which is higher than the BCS value of 1.43, indicating CuIr1.95Ru0.05Te4 is a strongly electron-phonon coupled superconductor. The values of lower {Hc1(0)} and upper {Hc2(0)} critical field calculated from isothermal magnetization {M(H)} and magnetotransport {ρ(T, H)} measurements are 0.98 KOe and 2.47 KOe respectively, signifying that the compound is clearly a type-II superconductor. Finally, a "dome-like" shape superconducting Tcs vs. x content phase diagram is established, where the charge density wave disappears at x = 0.03 while superconducting transition temperature (Tc) rises until it reaches its peak at x = 0.05, then, with decreasing when x reaches 0.3. This feature of the competition between CDW and the superconductivity could be caused by tuning the Fermi surface and density of states with Ru chemical doping.

show abstract

Resistance anomaly in CuIr2Te4

Cited by 15 publications

References 14 publications

Absence of structural transition inM0.5IrTe2(M = Mn, Fe, Co, Ni)

Absence of structural transition inM0.5IrTe2(M = Mn, Fe, Co, Ni)

Superconductivity in CuxIrTe2driven by interlayer hybridization

Superconductivity in Ru-doped CuIr2Te4 telluride chalcogenide

Contact Info

Product

Resources

About