Role of excess Cr at Fe site in FeCrxSe and FeCrxSe0.5Te0.5

Yadav, Anil K.; Thakur, Ajay D.; Tomy, C. V.
June 2012
AIP Conference Proceedings;6/5/2012, Vol. 1447 Issue 1, p907
Academic Journal
We report the improvement of superconducting properties on substitution of Cr in excess at the Fe site in FeCrxSe and FeCrxSe0.5Te0.5. In the case of FeCrxSe, there is an increase in superconducting transition temperature (Tc) by ∼40% with a concomitant increase in the superconducting volume fraction upon 2% excess substitution of Cr. In the case FeCrxSe0.5Te0.5, there is an enhancement in superconducting volume fraction with negligible changes in Tc.


Related Articles

  • Effect of magnetic frustration on nematicity and superconductivity in iron chalcogenides. Glasbrenner, J. K.; Mazin, I. I.; Jeschke, Harald O.; Hirschfeld, P. J.; Fernandes, R. M.; Valentí, Roser // Nature Physics;Nov2015, Vol. 11 Issue 11, p953 

    Over the past few years iron chalcogenides have been intensively studied as part of the wider family of iron-based superconductors, with many intriguing results reported so far on intercalated and monolayer FeSe. Nevertheless, bulk FeSe itself remains an unusual case when compared with...

  • Alkaline Earth (Ca) and Transition Metal (Ni) Doping on the Transport Properties of Y1-xCaxBa2(Cu1-yNiy)3O7-? Superconductors. Varshney, Dinesh; Yogi, Arvind; Dodiya, Neha; Mansuri, Irfan // Journal of Modern Physics (21531196);Aug2011, Vol. 2 Issue 8, p922 

    We report the results of dc resistivity, ac susceptibility, and thermopower study of partial substitution at Y (A site by Ca) and at Cu (B site by Ni) polycrystalline superconductors. The iodometric analysis reveals that the oxygen deficiency, ?, for YBa2Cu3O7-? (S-I), Y0.9Ca0.1 Ba2Cu3O7-?...

  • Convective solution transport - An improved technique for the growth of big crystals of the superconducting α-FeSe using KCl as solvent. Rao, S. M.; Mok, B. H.; Ling, M. C.; Ke, C. T.; Chen, T. C.; Tsai, I.-M.; Lin, Y.-L.; Liu, H. L.; Chen, C. L.; Hsu, F. C.; Huang, T. W.; Wu, T. B.; Wu, M. K. // Journal of Applied Physics;Dec2011, Vol. 110 Issue 11, p113919 

    An improved technique of convective solution transport using KCl as solvent at 840-790 °C (where mass transport takes place across a vertical temperature gradient) is described for the growth of crystals of the recently discovered superconductor α-FeSex (x = 1-0.8). The crystals were...

  • The Proximity Effect in an Fe–Cr–V–Cr–Fe System. Garifullin, I. A.; Tikhonov, D. A.; Garif'yanov, N. N.; Fattakhov, M. Z.; Tagirov, L. R.; Theiz-Bröhl, K.; Westerholt, K.; Zabel, H. // JETP Letters;7/10/2004, Vol. 80 Issue 1, p44 

    The proximity effect was studied in a thin-film Fe–Cr–V–Cr–Fe layered system. As the chromium layer thickness (dCr) increases at a fixed thickness of iron layers (dFe), the dependence of the superconducting transition temperature (Tc) on dCr exhibits a maximum at...

  • Effect of Te doping on structural and superconducting properties of FeSe superconductor. Sudesh, Stuti; Varma, G. D. // AIP Conference Proceedings;Jun2013, Vol. 1536 Issue 1, p355 

    In the present work, we have studied the effect of doping Te at the Se-site on the superconducting properties, such as transition temperature (Tc), upper critical field (Hc2) and irreversibility field (Hirr) of FeSe. The polycrystalline samples have been prepared via solid state reaction route...

  • Andreev reflection spectroscopy of the new Fe-based superconductor EuAsFeO0.85F0.15: Evidence of strong anisotropy in the order parameter. Dmitriev, V. M.; Khlybov, E. P.; Kondrashov, D. S.; Terekhov, A. V.; Rybaltchenko, L. F.; Khristenko, E. V.; Ishchenko, L. A.; Kostyleva, I. E.; Zaleski, A. J. // Low Temperature Physics;Apr2011, Vol. 37 Issue 4, p280 

    Andreev reflection spectra have been measured in a new superconductor EuAsFeO0.85F0.15 with an unexpectedly low superconducting transition temperature Tc ≈ 11.3 K compared to related FeAs compounds based on Sm and Gd surrounding Eu in lanthanide series. The nearly fivefold lower Tc,...

  • Pressure induced high spin-low spin transition in FeSe superconductor studied by x-ray emission spectroscopy and ab initio calculations. Kumar, Ravhi S.; Yi Zhang; Yuming Xiao; Baker, Jason; Cornelius, Andrew; Veeramalai, Sathishkumar; Chow, Paul; Changfeng Chen; Yusheng Zhao // Applied Physics Letters;8/8/2011, Vol. 99 Issue 6, p061913 

    FeSe is a simple binary system in the iron based superconducting family and exhibits a significant pressure induced increase in the superconducting transition temperature (Tc). In addition to pressure effect, spin fluctuations, magnetic ordering, and crystal structure all play vital roles in...

  • Influence of Multi-orbitals, Coulomb Correlations and Hund's Coupling on Transition Temperature in Doped Fe-Based Superconductors. Rani, Luxmi; Ajay // Journal of Superconductivity & Novel Magnetism;Jan2016, Vol. 29 Issue 1, p67 

    The present paper deals with the theoretical analysis of superconducting transition temperature ( T) within two-orbital-per-site model Hamiltonian in iron-based superconductors. The Green's function approach within the Bardeen-Cooper-Schrieffer (BCS) mean-field approximation has been applied....

  • Study of upper critical field in 1111-ferropnictide superconductors. Singh, S. J.; Prakash, J.; Maurya, V. K.; Ganguli, A. K.; Patnaik, S. // AIP Conference Proceedings;6/5/2012, Vol. 1447 Issue 1, p905 

    In this paper we have shown the doping effects of elements Y, F and Sb in place of RE (rare earth elements), O and As respectively in 1111-ferropnictides. We study the behavior of upper critical field and superconducting transition temperatures as a function of doping. In Ce and La based...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics