Magnetic Pair Breaking in Superconducting SrPd2Ge2 Investigated by Scanning Tunnelling Spectroscopy

Samuely, T.; Szabó, P.; Rodrigo, José A.; Sung, N. H.; Cho, B. K.; Samuely, P.

doi:10.1007/s10948-012-1960-z

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…Our results are also compared with previous experimental [8,9,[11][12][13] and theoretical results [14,17] in this table. In general, the presently calculated superconducting parameters for all the presently studied materials are in reasonable accordance with available experimental [8,9,[11][12][13] and theoretical results [14,17]. In particular, the calculated T c value of 3.20 K for SrPd 2 Ge 2 is in perfect agreement with its experimental value [8] As regards the electronic structure, the largest N (E F ) value is obtained for SrPd 2 Ge 2 .…”

Section: B Phonons and Electron-phonon Interactionmentioning

confidence: 67%

“…Moreover, due to the presence of the nonmagnetic metal Pd, no magnetic order exists to possibly weaken or interfere with the superconducting state. Following the experimental work of Fujii and Sato [8], the BCS-type superconductivity in SrPd 2 Ge 2 has been confirmed by different experimental groups [9][10][11][12]. Recently, the crystallographic, electronic transport, thermal, magnetic, and superconducting properties of SrPd 2 As 2 and CaPd 2 As 2 have been investigated in the experimental work of Anand and co-workers [13].…”

Section: Introductionmentioning

confidence: 86%

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Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, and
Karaca
¹
,
Tütüncü
²
,
Uzunok
³

et al. 2016
Phys. Rev. B

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Ab initio pseudopotential calculations have been performed to investigate the structural, electronic, and vibrational properties of SrPd 2 Ge 2 , SrPd 2 As 2 , and CaPd 2 As 2 crystallizing in the ThCr 2 Si 2-type body-centered tetragonal structure. Our electronic results show that the density of states at the Fermi level is mainly dominated by the strong hybridization of Pd d states and Ge (or As) p states. The linear response method and the Migdal-Eliashberg approach have been used to calculate the Eliashberg spectral function for all these compounds. By integrating the Eliashberg spectral function, the average electron-phonon coupling parameter (λ) is found to be 0.74 for SrPd 2 Ge 2 , 0.66 for SrPd 2 As 2 , and 0.72 for CaPd 2 As 2. Using the calculated values of λ and the logarithmically averaged phonon frequency ω ln the superconducting critical temperature (T c) values for SrPd 2 Ge 2 , SrPd 2 As 2 , and CaPd 2 As 2 are found to be 3.20, 2.05, and 2.48 K, respectively, which are in acceptable agreement with the corresponding experimental values. The relative differences in the T c values between the Ge and As compounds have been explained in terms of some key physical parameters.

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Section: B Phonons and Electron-phonon Interactionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 86%

Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, and
Karaca
¹
,
Tütüncü
²
,
Uzunok
³

et al. 2016
Phys. Rev. B

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“…The scanning tunneling microscopy and spectroscopy experiments were performed by means of a homemade STM head [9] controlled by the Nanotec's Dulcinea SPM electronics. The head is inserted in a commercial Janis SSV cryomagnetic system with 3 He refrigerator and the Au tip was prepared in situ by repetitive impaling into the bulk Au sample and subsequent slow retraction.…”

Section: Methodsmentioning

confidence: 99%

Suppression of the superconductivity in ultrathin amorphous Mo78Ge22 films observed by STM

Lotnyk

Onufriienko

Samuely

et al. 2017

Low Temperature Physics

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In contact with a superconductor a normal metal modifies its properties due to Andreev reflection. In the current work the local density of states (LDOS) of superconductor-normal metal Mo 78 Ge 22 -Au bilayers are studied by means of STM applied from the Au side. Three bilayers have been prepared on silicate glass substrate consisting of 100, 10 and 5 nm MoGe thin films covered always by 5 nm Au layer. The tunneling spectra were measured at temperatures from 0.5 to 7 K. The two-dimensional cross-correlation between topography and normalized zero-bias conductance indicates a proximity effect between 100 and 10 nm MoGe thin films and Au layer where a superconducting gap slightly smaller than that of bulk MoGe is observed. The effect of the thinnest 5 nm MoGe layer on Au leads to much smaller gap moreover the LDOS reveals almost completely suppressed coherence peaks. This is attributed to a strong pair-breaking effect of spin-flip processes at the interface between MoGe films and the substrate.

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“…This structure and the common BaNiSn 3 structures are both derivatives of the BaAl 4 -type structure [26]. ThCr 2 Si 2 -type AM 2 X 2 compounds (A: an alkaline earth or a lanthanide element; M: a transition metal; X: P, Ge, or As) have also been widely studied due to their superconducting and magnetic properties [27][28][29][30][31][32][33][34]. Recently, the lattice parameters, electronic structures, elastic constants, Vicker's hardness and thermodynamics properties of SrAuSi 3 were systematically investigated by using first-principles and the quasi-harmonic Debye model [35].…”

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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Magnetic Pair Breaking in Superconducting SrPd2Ge2 Investigated by Scanning Tunnelling Spectroscopy

Cited by 4 publications

References 8 publications

Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, and
Karaca
¹
,
Tütüncü
²
,
Uzunok
³

et al. 2016
Phys. Rev. B

Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, and
Karaca
¹
,
Tütüncü
²
,
Uzunok
³

et al. 2016
Phys. Rev. B

Suppression of the superconductivity in ultrathin amorphous Mo78Ge22 films observed by STM

Theoretical investigation of superconductivity in SrAuSi3 and SrAu2Si2

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Magnetic Pair Breaking in Superconducting SrPd2Ge2 Investigated by Scanning Tunnelling Spectroscopy

Cited by 4 publications

References 8 publications

Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, andKaraca1, Tütüncü2, Uzunok3 et al. 2016Phys. Rev. B

Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, andKaraca1, Tütüncü2, Uzunok3 et al. 2016Phys. Rev. B

Suppression of the superconductivity in ultrathin amorphous Mo78Ge22 films observed by STM

Theoretical investigation of superconductivity in SrAuSi3 and SrAu2Si2

Contact Info

Product

Resources

About

Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, and
Karaca
¹
,
Tütüncü
²
,
Uzunok
³

et al. 2016
Phys. Rev. B

Theoretical investigation of superconductivity inSrPd2Ge2,SrPd2As2, and
Karaca
¹
,
Tütüncü
²
,
Uzunok
³

et al. 2016
Phys. Rev. B