Physical properties of Cd doped CeIrIn₅ under pressure

Abstract

We measured the electrical resistivity ρ of CeIr(In1-xCdx)5 under pressure for x = 0.05 and 0.10, which show the onset of superconductivity (SC) at Tsc onset ~ 0.9 K and antiferromagnetic transition at TN ~ 3.4 K. For x = 0.05, Tsc onset increases by applying pressure up to 2.8 GPa and zero resistivity is observed at Tsc ρ=0 above 2.4 GPa. For x = 0.10, the pressure dependence of TN shows peak at around 2 GPa and TN seems to be 0 K toward 3 GPa, where SC phase appears. The maximum value of Tsc ρ=0 is independent on amount of doped Cd, showing 1.35 K. We analyzed the temperature dependence of the electrical resistivity ρ for x = 0.05 and 0.10 under pressure using the following equation, ρ = ρ0 + AT n . This analysis revealed that ρ shows the sublinear temperature dependence (n < 1) in the wide temperature region above Tsc ρ=0 , and ρ0 decreases abruptly in the pressure region where Tsc ρ=0 indicates a maximum.

Magnetic structure of Cd-doped CeIrIn5

“…This function was successfully used to fit the temperature dependence of the magnetic Bragg peak intensity in other heavy-fermion compounds, such as CePd 2 Si 2 [25,26], Sn-doped CeRhIn 5 [12], Cd-doped CeRhIn 5 [18], and CePt 2 In 7 [27]. The best fit is obtained with α = 2.0 ± 0.5 and T N = 3.0 ± 0.1 K. The latter value is consistent with T N determined from previous specific-heat [17] and resistivity [22] measurements. It is also in agreement with the magnetic susceptibility data shown in Fig.…”

“…At low temperatures, we found magnetic intensity at the commensurate wave vector Q AF = (1/2, 1/2, 1/2). The magnetic intensity is building up below T N ≈ 3 K, with T N being in good agreement with specific heat [17], resistivity [22], and magnetic susceptibility data. No indication for additional intensity was observed at incommensurate positions, such as (1/2, 1/2, 0.297), where CeRhIn 5 , the related antiferromagnetic member of the CeMIn family, orders.…”

“…Single crystals of CeIr(In 0.9 Cd 0.1 ) 5 were grown using a standard In-flux technique with a nominal concentration of 10% Cd in the indium flux [22]. Previous microprobe measurements performed on a series of CeCo(In 1−x Cd x ) 5 samples grown by the same technique suggest that the actual Cd concentration is only 10% of the nominal flux concentration [17,20].…”

Magnetic structure of Cd-doped CeIrIn$_5$

“…At low temperatures, we found magnetic intensity at the commensurate wave vector Q AF = (1/2, 1/2, 1/2). The magnetic intensity is building up below T N ≈ 3 K, with T N being in good agreement with specific heat 17 , resistivity 22 , and magnetic susceptibility data. No indication for additional intensity was observed at incommensurate positions, such as (1/2, 1/2, 0.297), where CeRhIn 5 , the related antiferromagnetic member of the CeM In family, orders.…”