Superconductivity in 4d and 5d transition metal layered pnictides BaRh2P2, BaIr2P2 and SrIr2As2

Hirai, Daigorou; Takayama, T.; Hashizume, Daisuke; Higashinaka, Ryuji; Yamamoto, Atsushi; Hiroko, A.K.; Takagi, H.

doi:10.1016/j.physc.2009.11.059

Cited by 31 publications

(42 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, the calculated lattice parameters and internal parameters for all the ternary phosphides BaM 2 P 2 are in good accordance with previous experimental [20,25,27,28,32] and theoretical [17,24,30] results. The maximum difference in the lattice parameters is around 2.0% for all the studied compounds, while the maximum difference in the internal parameter z is around 0.7% for BaNi 2 P 2 .…”

Section: A Structural and Electronic Propertiessupporting

confidence: 89%

“…In our calculations, the value of μ * is chosen to be 0.13. The calculated values of N (E F ), ω ln , λ, T c , and γ for the ternary phosphides BaM 2 P 2 are reported in Table IV, along with available experimental results [19,25,32]. In general, our calculated superconducting parameters for all the presently studied compounds compare very well with available experimental results [19,25,32].…”

Section: B Phonons and Electron-phonon Interactionsupporting

confidence: 74%

“…By integrating the Eliashberg spectral function, the average electron-phonon coupling parameter is determined for all the studied ternary phosphides. Finally, the calculated superconducting parameters for all the studied ternary phosphides are found in gratifying agreement with their corresponding experimental values [19,25,32,33].…”

Section: Introductionsupporting

confidence: 78%

See 2 more Smart Citations

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

et al. 2016

View full text Add to dashboard Cite

Ab initio plane-wave pseudopotential calculations of electronic and vibrational properties have been carried out for the ternary phosphides BaM 2 P 2 (M = Ni, Rh and Ir) with a ThCr 2 Si 2 -type structure. The calculated electronic results show the metallic character of BaM 2 P 2 , and the plots of total and partial density of states of BaM 2 P 2 exhibit strong hybridization between the d states of the M atom and the p states of the P atom below the Fermi energy. Differences in the phonon spectrum and density of states both in the acoustical and optical ranges for these compounds are presented and discussed. The Eliashberg spectral function for these compounds has been calculated by using a linear response approach based on the density functional theory. By integrating the Eliashberg spectral function, the average electron-phonon coupling parameter (λ) is determined to be 0.61 for BaNi 2 P 2 , 0.55 for BaIr 2 P 2 , and 0.43 for BaRh 2 P 2 . Using the calculated values of λ and the logarithmically averaged phonon frequency ω ln the superconducting critical temperature (T c ) values for BaNi 2 P 2 , BaIr 2 P 2 , and BaRh 2 P 2 are obtained to be 2.80, 1.97, and 0.70 K, respectively, which compare very well with their experimental values of 3.0, 2.1, and 1.0 K.

show abstract

Section: A Structural and Electronic Propertiessupporting

confidence: 89%

Section: B Phonons and Electron-phonon Interactionsupporting

confidence: 74%

See 1 more Smart Citation

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

et al. 2016

View full text Add to dashboard Cite

show abstract

“…LaRu 2 P 2 , BaRh 2 P 2 , SrPd 2 Ge 2 , SrIr 2 As 2 , etc., while their superconducting T c is all very low within several degrees Kelvin [11][12][13][14].…”

mentioning

confidence: 99%

Superconductivity at 3.85 K in BaPd ₂ As ₂ with the ThCr ₂ Si ₂ -type structure

Guo¹,

Jia²,

Ruan³

et al. 2016

EPL

View full text Add to dashboard Cite

The single crystal of ThCr2Si2-type BaPd2As2 was successfully prepared by a self-flux method, and the crystal structure was characterized by X-ray diffraction method with the lattice parameters and (space group , No. 139). Bulk superconductivity below a Tc (critical temperature) of 3.85 K was revealed in this compound by the measurements of resistivity, magnetic susceptibility and specific heat, and this Tc is much higher than those of other isostructural Pd-based superconductors.

show abstract

“…21,22,[27][28][29] For the Ni-based arsenides, which are isoelectronic to SrPt 2 As 2 , ¼ 8:7 and 10.8 mJ/(molÁK 2 ) for SrNi 2 As 2 21) and BaNi 2 -As 2 , 22) respectively. However, T c is almost one order of magnitude different between SrPt 2 As 2 and the Ni-based 122 system: T c ¼ 5:2 K for SrPt 2 As 2 , while T c ¼ 0:62 and 0.7 K for SrNi 2 As 2 21) and BaNi 2 As 2 , 22) respectively.…”

mentioning

confidence: 99%

Coexistence of Superconductivity and Charge Density Wave in SrPt₂As₂

2010

View full text Add to dashboard Cite

SrPt 2 As 2 is a novel arsenide superconductor, which crystallizes in the CaBe 2 Ge 2 -type structure as a different polymorphic form of the ThCr 2 Si 2 -type structure. SrPt 2 As 2 exhibits a charge-density-wave (CDW) ordering at about 470 K and enters into a superconducting state at T c ¼ 5:2 K. The coexistence of superconductivity and CDW refers to Peierls instability with a moderately strong electron-phonon interaction. Thus SrPt 2 As 2 can be viewed as a nonmagnetic analog of iron-based superconductors, such as doped BaFe 2 As 2 , in which superconductivity emerges in close proximity to spin-density-wave ordering.KEYWORDS: non-iron-based pnictide, superconductivity, charge-density wave, SrPt 2,3) BaFe 2 As 2 is the compound most studied among the iron-based families so far and is widely thought to represent the generic features of the iron-based superconductors.2,3) BaFe 2 As 2 exhibits AFM ordering below T N ¼ 140 K.4) The partial chemical substitution of either Ba, Fe, or As ions with a different element suppresses the AFM ordering and induces superconductivity.5-8) The maximum superconducting transition temperature, T c ¼ 38 K for (Ba 1Àx K x )Fe 2 As 2 , 5) is obtained near the critical concentration where AFM ordering is completely suppressed.It has been widely thought that AFM ordering in ironbased superconductors originates from the spin-densitywave (SDW) instability due to the nesting of two Fermi pockets, a hole pocket centered at the À point and an electron pocket centered at the M point, which are connected by the nesting vector Q ¼ ð; Þ.9-12) This characteristic electronic structure is believed to be a key ingredient of the high-temperature superconductivity due to AFM spin fluctuations in iron-based families. 2,3,13,14) Moreover, it has been theoretically proposed that the nesting determines the symmetry of Cooper pairs in the iron-based superconductors, in which a node locates either away from the Fermi surfaces (s AE -wave) 13,14) or directly at the Fermi surface (d-wave).14)The charge-density-wave (CDW) instability is another consequence of Fermi-surface nesting when electron-phonon interaction remains important. CDW ordering, as well as SDW ordering, competes with or coexists with superconductivity. [15][16][17][18][19][20] In this letter, we demonstrate that superconductivity at T c ¼ 5:2 K coexists with CDW in platinumbased 122 arsenide SrPt 2 As 2 . The superconducting transition temperature of SrPt 2 As 2 is considerably high compared with those of other non-iron-based 122 arsenides such as SrNi 2 As 2 (T c ¼ 0:62 K) 21) and BaNi 2 As 2 (T c ¼ 0:7 K). 22)Our observation suggests that Fermi-surface nesting is a key ingredient of the relatively high superconducting transition temperature of SrPt 2 As 2 . SrPt 2 As 2 crystallizes in a tetragonal CaBe 2 Ge 2 -type structure with the space group P4=nmm (#129), 23) as shown in Fig. 1(a). The structure is different from another polymorphic form of 122, a ThCr 2 Si 2 -type structure with the space group I4=mmm (#139), in which BaFe 2 As 2 cryst...

show abstract

Superconductivity in 4d and 5d transition metal layered pnictides BaRh2P2, BaIr2P2 and SrIr2As2

Cited by 31 publications

References 9 publications

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

Superconductivity at 3.85 K in BaPd ₂ As ₂ with the ThCr ₂ Si ₂ -type structure

Coexistence of Superconductivity and Charge Density Wave in SrPt₂As₂

Contact Info

Product

Resources

About

Superconductivity in 4d and 5d transition metal layered pnictides BaRh2P2, BaIr2P2 and SrIr2As2

Cited by 31 publications

References 9 publications

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

Electron-phonon superconductivity in the ternary phosphidesBaM2P2(M=Ni,Rh,a

Superconductivity at 3.85 K in BaPd 2 As 2 with the ThCr 2 Si 2 -type structure

Coexistence of Superconductivity and Charge Density Wave in SrPt2As2

Contact Info

Product

Resources

About

Superconductivity at 3.85 K in BaPd ₂ As ₂ with the ThCr ₂ Si ₂ -type structure

Coexistence of Superconductivity and Charge Density Wave in SrPt₂As₂