Probing the superconducting ground state of the noncentrosymmetric superconductors<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Ca</mml:mi><mml:mi>T</mml:mi><mml:msub><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>T</mml:mi></mml:math>= Ir, Pt) using muon-spin relaxation and rotation

Singh, R. P.; Hillier, A. D.; Chowdhury, Debanjan; Barker, James; Paul, D. McK.; Lees, Martin R.

doi:10.1103/physrevb.90.104504

Cited by 27 publications

(15 citation statements)

References 42 publications

(42 reference statements)

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“…As can be seen from this table, the effect of SOI on the structural properties of CaIrSi 3 is very small. Our results for a and c with SOI are only 0.4% and 0.5% different from the recent experimental values [21] of 4.196Å and 9.871Å. Similarly, our results for z Ir , z Si1 and z Si2 , with SOI, are within 0.1%, 0.1% and 0.2% of the experimental values [18].…”

Section: Structural and Electronic Propertiessupporting

confidence: 73%

“…The calculated equilibrium lattice parameters (a and c), the volume of primitive unit cell (V ), internal parameters (z Ir , z Si1 and z Si2 ), bulk modulus (B) and its pressure derivative (B ′ ) with and without SOI are presented in Tab. 1, together with previous theoretical [23,24] and experimental [18,21] results for comparison. As can be seen from this table, the effect of SOI on the structural properties of CaIrSi 3 is very small.…”

Section: Structural and Electronic Propertiesmentioning

confidence: 99%

“…Single crystalline samples have facilitated researches to predict various interesting phenomena as well as investigate the basic information of superconductivity, such as the gap anisotropy and the mixing ratio of the singlet and triplet components. Furthermore, the superconducting properties of CaIrSi 3 have been also investigated using the muon spectroscopy [21,22].…”

Section: Introductionmentioning

confidence: 99%

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The effect of spin orbit interaction for superconductivity in the noncentrosymmetric superconductor CaIrSi3

Uzunok

İpsara

Tütüncü

et al. 2016

Journal of Alloys and Compounds

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We have carried out an ab initio study of the electronic, vibrational and electronphonon interaction properties of the body-centred tetragonal CaIrSi 3 by employing the density functional theory, a linear-response formalism, and the plane-wave pseudopotential method. The electronic structure and phonon dispersion relations of this material have been analyzed with and without the inclusion of spin-orbit interaction (SOI). Our electron-phonon interaction results reveal that Si-related phonon modes are more involved in the process of scattering of electrons than the remaining phonon modes due to considerable existence of the Si 3p states near the Fermi level. By integrating the Eliashberg spectral function, the average electron-phonon coupling parameter is found to be 0.58 which compares very well with its experimental value of 0.56. Using the calculated value of λ, the superconducting critical temperature (T c ) for CaIrSi 3 is found to be 3.20 K which is in good accordance with its experimental value of 3.55 K. Furthermore, we have shown that the effect of SOI on the values of λ and T c is very small.

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Section: Structural and Electronic Propertiessupporting

confidence: 73%

Section: Structural and Electronic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of spin orbit interaction for superconductivity in the noncentrosymmetric superconductor CaIrSi3

Uzunok

İpsara

Tütüncü

et al. 2016

Journal of Alloys and Compounds

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“…To date, the only NCS that have yet been reported to show TRSB are LaNiC 2 [8], Re 6 Zr [9], locally noncentrosymmetric SrPtAs [10], and La 7 Ir 3 [11]. Meanwhile, TRS is found to be preserved in several other NCS including Ca(Ir,Pt)Si 3 [12], La(Rh,Pt,Pd,Ir)Si 3 [13][14][15], Mg 10 Ir 19 B 16 [16], Re 3 W [17], and Mo 3 Al 2 C [18]. The results obtained from transverse field muon measurements seem to imply a dominant s-wave component in the superconductivity of these systems, however, the full story requires a good understanding of the point group symmetry of the materials in question.…”

mentioning

confidence: 95%

Time-reversal symmetry breaking in the noncentrosymmetric superconductor Re6Hf : Further evidence for unconventional behavior in the α -Mn family of materials

Singh¹,

Barker²,

Thamizhavel³

et al. 2017

Phys. Rev. B

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103

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The discovery of new families of unconventional superconductors is important both experimentally and theoretically, especially if it challenges current models and thinking. By using muon spin relaxation in zero-field, time-reversal symmetry breaking has been observed in Re6Hf. Moreover, the temperature dependence of the superfluid density exhibits s-wave superconductivity with an enhanced electron-phonon coupling. This, coupled with the results from isostructural Re6Zr, shows that the Re6X family are indeed a new and important group of unconventional superconductors.

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“…The majority of Ce materials are antiferromagnetic and become superconducting only under pressure. However, in materials such as BaPtSi 3 [17], LaRhSi 3 [18], CaPtSi 3 [19,20], CaIrSi 3 [19,20], LaPtSi 3 [21], and LaPdSi 3 [21], which also adopt the body-centered tetragonal BaNiSn 3 -type structure but do not show strong electronic correlations, superconductivity with the BCS characteristics has been discovered at ambient pressure.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of superconductivity in SrAuSi3 and SrAu2Si2

Arslan

Karaca

Tütüncü

et al. 2016

Journal of Physics and Chemistry of Solids

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The structural and electronic properties of BaNiSn 3 -type SrAuSi 3 and ThCr 2 Si 2 -type SrAu 2 Si 2 have been investigated by using the planewave pseudopotential method and the density functional theory. The electronic structures and phonon dispersion relations of these two materials have been analyzed with and without the inclusion of spin-orbit interaction, and similarities and differences highlighted. By integrating the Eliashberg spectral function α 2 F(ω), the average electron-phonon coupling parameter is determined to be λ = 0.47 for SrAuSi 3 and 0.42 for SrAu 2 Si 2 . The largest contribution to the electron-phonon coupling for SrAuSi 3 comes from the Si p electrons near the Fermi energy and Si-related vibrations. Using a reasonable value of µ * = 0.12 for the effective Coulomb repulsion parameter, the superconducting critical temperature T c for SrAuSi 3 is found to be 1.47 K which compares very well with its experimental value of 1.54 K.

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Probing the superconducting ground state of the noncentrosymmetric superconductorsCaTSi3(T= Ir, Pt) using muon-spin relaxation and rotation

Cited by 27 publications

References 42 publications

The effect of spin orbit interaction for superconductivity in the noncentrosymmetric superconductor CaIrSi3

The effect of spin orbit interaction for superconductivity in the noncentrosymmetric superconductor CaIrSi3

Time-reversal symmetry breaking in the noncentrosymmetric superconductor Re6Hf : Further evidence for unconventional behavior in the α -Mn family of materials

Theoretical investigation of superconductivity in SrAuSi3 and SrAu2Si2

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