Abstract
The 3D phase diagram of iron pnictides where the critical temperature depends on charge density and microstrain in the active FeAs layers is proposed. The iron pnictides superconductors are shown to be a practical realization of a heterostructure at the atomic limit made of a superlattice of FeAs layers intercalated by spacer layers. We have focussed our interest on the A1−x B x Fe2As2 (122) families and we show that FeAs layers have a tensile microstrain due to the misfit strain between the active layers and the spacers. We have identified the critical range of doping and microstrain where the critical temperature gets amplified to its maximum value.
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Kamihara, Y., : Iron-based layered superconductor LaO1−x F x FeAs (x=0.05−0.12) with T c =26 K. J. Am. Chem. Soc. 130, 3296 (2008)
Bianconi, A.: Process of increasing the critical temperature T c of a bulk superconductor by making metal heterostructures at the atomic limit. United State Patent No.:US6, 265, 019 B1 (2001)
Tokura, Y., Arima, T.: New classification method for layered copper oxide compounds and its application to design of new high T c superconductors. Jpn. J. Appl. Phys. 29, 2388 (1990). doi:10.1143/JJAP.29.2388
Bianconi, A.: On the possibility of new high T c superconductors by producing metal heterostructures as in the cuprate perovskites. Solid State Commun. 89, 933 (1994)
An, J.M., Pickett, W.E.: Superconductivity of MgB2: covalent bonds driven metallic. Phys. Rev. Lett. 86, 4366 (2001)
Bianconi, A., Di Castro, D., Agrestini, S., Campi, G., Saini, N.L., Saccone, A., De Negri, S., Giovannini, M.: A superconductor made by a metal heterostructure at the atomic limit tuned at the ‘shape resonance’: MgB2. J. Phys., Condens. Matter 13, 7383 (2001)
Okado, H., : Superconductivity under high pressure in LaFeAsO. J. Phys. Soc. Jpn. 77, 113712 (2008). doi:10.1143/JPSJ.77.113712
Ren, Z.-A., : Novel superconductivity and phase diagram in the iron-based arsenic-oxides ReFeAsO1−δ (Re = rare earth metal) without F-doping. Europhys. Lett. 83, 17002 (2008). doi:10.1209/0295-5075/83/17002
Hwang, H.Y., : Lattice effects on the magnetoresistance in doped LaMnO3. Phys. Rev. Lett. 75, 914 (1995)
Osbourn, G.C.: Strained-layer superlattices: A brief review. IEEE J. Quantum Electron. QE-22, 1677 (1986)
Bianconi, A., Bianconi, G., Caprara, S., Di Castro, D., Oyanagi, H., Saini, N.L.: The stripe critical point for cuprates. J. Phys., Condens. Matter 12, 10655 (2000)
Poccia, N., Fratini, M.: The misfit strain critical point in the 3D phase diagrams of cuprates. J. Supercond. Novel Magn. 22, 1557 (2009). doi:10.1007/s10948-008-0435-8
Fratini, M., : The Feshbach resonance and nanoscale phase separation in a polaron liquid near the quantum critical point for a polaron Wigner crystal. J. Phys., Conf. Ser. 108, 012036 (2008). doi:10.1088/1742-6596/108/1/012036
Kugel, K.I., : Model for phase separation controlled by doping and the internal chemical pressure in different cuprate superconductors. Phys. Rev. B 78, 165124 (2008)
Kugel, K.I., : Two-band model for the phase separation induced by the chemical mismatch pressure in different cuprate superconductors. Supercond. Sci. Technol. 22, 014007 (2009). doi:10.1088/09532048/22/1/014007
Agrestini, S., : High T c superconductivity in a critical range of micro-strain and charge density in diborides. J. Phys., Condens. Matter 13, 11689 (2001)
Sasmal, K., : Superconducting Fe-based compounds (A1−x Sr x )Fe2As2 with A=K and Cs with transition temperatures up to 37 K. Phys. Rev. Lett. 101, 107007 (2008)
Rotter, M., Tegel, M., Johrend, D.: Superconductivity at 38 K in the iron arsenide (Ba1−x K x )Fe2As2. Phys. Rev. Lett. 101, 107006 (2008)
Luo, H., Wang, Z., Yang, H., Cheng, P., Zhu, X., Wen, H.-H.: Growth and characterization of A1−x K x Fe2As2 (A = Ba, Sr) single crystals with x=0−0.4. Supercond. Sci. Technol. 21, 125014 (2008). doi:10.1088/0953-2048/21/12/125014
Wu, G., Liu, R.H., Chen, H., Yan, Y.J., Wu, T., Xie, Y.L., Ying, J.J., Wang, X.F., Fang, D.F., Chen, X.H.: Transport properties and superconductivity in Ba1−x M x Fe2As2 (M = La and K) with double FeAs layers. arXiv:0806.1459 [cond-mat] (2008)
Wu, G., Chen, H., Wu, T., Xie, Y.L., Yan, Y.J., Liu, R.H., Wang, X.F., Ying, J.J., Chen, X.H.: Different resistivity response to spin-density wave and superconductivity at 20 K in Ca1−x Na x Fe2As2. J. Phys., Condens. Matter 20, 422201 (2008)
Pitcher, M.J., Parker, D.R., Adamson, P., Herkelrath, S.J.C., Boothroyd, A.T., Clarke, S.J.: Structure and superconductivity of LiFeAs. Chem. Commun. 5918 (2008). doi:10.1039/b813153h
Bianconi, A., : A quantum phase transition driven by the electron lattice interaction gives high T C superconductivity. J. Alloys Comp. 537, 317–318 (2001). doi:10.1016/S0925-8388(00)01383-9
Lee, C.-H., : Effect of structural parameters on superconductivity in fluorine-free LnFeAsO1−y (Ln = La, Nd). J. Phys. Soc. Jpn. 77, 083704 (2008)
Caivano, R., : Feshbach resonance and mesoscopic phase separation near a quantum critical point in multiband FeAs-based superconductors. Supercond. Sci. Technol. 22, 014004 (2009). doi:10.1088/0953-2048/22/1/014004
Ekins, N.J., : Strain-balanced criteria for multiple quantum well structures and its signature in X-ray rocking curves. Cryst. Growth Des. 2, 287 (2002)
Qi, Y., Xu, C.: Global phase diagram for magnetism and lattice distortion of Fe-pnictide materials. arXiv:0812.0016v3 (2008)
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Ricci, A., Poccia, N., Ciasca, G. et al. The Microstrain-Doping Phase Diagram of the Iron Pnictides: Heterostructures at Atomic Limit. J Supercond Nov Magn 22, 589–593 (2009). https://doi.org/10.1007/s10948-009-0473-x
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DOI: https://doi.org/10.1007/s10948-009-0473-x