Superconducting Properties of CdCNi<sub>3</sub>

Uehara, M.; Yamazaki, Takahiro; Kôri, Tatsuya; Kashida, Takeshi; Kimishima, Y.; Hase, Izumi

doi:10.1143/jpsj.76.034714

Cited by 74 publications

(60 citation statements)

References 17 publications

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“…1. At ambient pressure the T c was 3.58 K. This value also corresponds to the expected value of the lattice parameter [2]. As the pressure was increased, T c increased from 3.58 to 3.73 K at 0.6 GPa.…”

Section: Methodssupporting

confidence: 75%

“…The T c of Pb used in the estimation of the pressure and the error bars were defined using the same procedure. At ambient pressure, T c was 1.87 K. This corresponds to the expected value for the lattice parameter [2]. As the pressure was increased, the T c slightly increased from 1.87 to 1.90 K at 1.5 GPa.…”

Section: Methodssupporting

confidence: 64%

“…Figure 4 shows the linear fit for the data with x ≥ 0.2. The extrapolated value of the lattice parameter at x = 0 suggests that the y value in CdC y Ni 3-x Cr x is ~0.95, which corresponds to the expected T c of ~2 K for y = 0.95 [2]. To compare the x = 0 sample with the Cr-doped samples, the CdC y was not suppressed but seemed to slightly increase, though T c for other dopant case was suppressed roughly being proportional to the de Gennes factor of M [11].…”

Section: Resultsmentioning

confidence: 83%

“…Synthesis was carried out with a cubic anvil-type high-pressure apparatus at 900 °C and 3.5 GPa for 0.5 h. The two resultant samples had cubic structures with lattice constants of 3.848 and 3.843 Å for the Cd 1.1 C 0.95 Ni 3 and Cd 1.1 CNi 3 nominal compositions, respectively. According to our previous study [2], the sample with the lattice constant of 3.848 Å can be estimated to have a C content of y ≈ 0.96, whereas for the sample with a lattice constant of .843 Å, y is ~0.93. It should be noted that in the CdC y Ni 3 system, most of the samples synthesized has a y value around 0.96, regardless of the subtle differences in the nominal composition and the sintering condition.…”

Section: Methodsmentioning

confidence: 92%

“…CdC y Ni 3 is an antiperovskite superconductor [1,2]. The superconducting transition temperature (T c ) in CdC y Ni 3 is from less than 1.8 K to ~3.5 K, depending on y.…”

Section: Introductionmentioning

confidence: 99%

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Pressure and Cr-Doping Effects of CdC_yNi₃

Iwase¹,

Kimishima²,

Uehara³

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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The superconducting transition temperature (T c ) of CdC y Ni 3 was measured under different pressures. The T c increased at rates of 0.190 and 0.017 K/GPa for samples with y ≈ 0.93 and 0.96, respectively when the pressure was increased. The effect of the pressure on the y ≈ 0.93 sample is the largest among the antiperovskite superconductors. This result can be understood based on the difference between the bulk moduli of the antiperovskite superconductors, except for the y ≈ 0.96 sample. Cr-doped CdC y Ni 3-x Cr x was synthesized and the magnetic susceptibility was measured. The T c increased from 1.87 K at x = 0 to 4 K for x values of 0.7 and 0.8. This result probably arises from a reduction in the carrier concentration, not from the chemical pressure effect by Cr doping.

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Section: Methodssupporting

confidence: 75%

Section: Methodssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 83%

Section: Methodsmentioning

confidence: 92%

“…CdC y Ni 3 is an antiperovskite superconductor [1,2]. The superconducting transition temperature (T c ) in CdC y Ni 3 is from less than 1.8 K to ~3.5 K, depending on y.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Pressure and Cr-Doping Effects of CdC_yNi₃

Iwase¹,

Kimishima²,

Uehara³

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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Low-Temperature Thermodynamic Properties of Superconducting Antiperovskite CdCNi $$_3$$ 3

et al. 2016

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We investigate the thermodynamic parameters of the superconducting antiperovskite CdCNi 3 using the Eliashberg approach which is an excellent tool to the exact characterization of the conventional superconductors. In particular, we reproduce the measured superconducting transition temperature (T C = 3.2 K) for a high value of the Coulomb pseudopotential (μ C = 0.22). Then we determine the energy gap, the thermodynamic critical field and the specific heat for the superconducting and normal state. On this basis, we show that the thermodynamic properties of CdCNi 3 differ slightly from the prediction of the Bardeen-Cooper-Schrieffer theory, which means that CdCNi 3 is a medium-coupling superconductor in contrast to related strongcoupling MgCNi 3 .

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