Role of the mercury pressure during reaction synthesis of Hg(Re)-based superconducting films

• Authors: M. Valeriánová , Š. Chromik , P. Odier , V. Štrbík
• Languages of publication: EN

Abstracts

EN

Thin films of mercury based superconductors were prepared on the R-plane sapphire with a CeO2 buffer layer using a two step process involving the deposition of the Hg-free precursor and ex situ mercuration in the sealed quartz tube. For the thin film preparation, a method with no contact between the mercury source and the precursor film was used for mercuration. We studied the influence of the basic parameters of the mercuration (annealing time, temperature and partial pressure of the mercury) regarding the composition and superconducting properties of prepared Hg-based films to determine appropriate conditions for this mercuration method. We found out that an increased partial pressure of mercury inhibited the creation of the parasitic Re-based phase and supported the crystallization of the superconducting phase. The advantage of this mercuration method is higher reproducibility as well as its capability to prepare high quality thin large areas films.

Keywords

EN

Hg-based superconductors; thin films; R-plane sapphire

Discipline

• 74.62.Bf: Effects of material synthesis, crystal structure, and chemical composition(for methods of materials synthesis, see 81.20.-n)

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2007
• Volume: 5
• Issue: 3
• Pages: 446-456

Dates

published

1 - 9 - 2007

online

1 - 5 - 2007

Contributors

author

M. Valeriánová

author

Š. Chromik

• Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04, Bratislava, Slovak Republic

author

P. Odier

• Néel Institute, Centre National de la Recherche Scientifique, 25 Avenue des Martyrs, BP 166, 38042, Grenoble Cedex 09, France

author

V. Štrbík

• Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 841 04, Bratislava, Slovak Republic

References

• [1] V. A. Alyoshin, D. A. Mikhailova and E. V. Antipov: “Synthesis of HgBa2CuO4+δ under controlled mercury and oxygen pressures”, Physica C, Vol. 271, (1996), pp. 197–204. http://dx.doi.org/10.1016/S0921-4534(96)00542-4[Crossref]
• [2] S. N. Putilin et al.: “Superconductivity at 94 K in HgBa2CuO4+δ ”, Nature, Vol. 362, (1993), pp. 226–228. http://dx.doi.org/10.1038/362226a0[Crossref]
• [3] K. Kníšek et al.: “Mercury pressure during synthesis of the HgBa2CaCu2O6+δ superconductor”, Physica C, Vol. 371, (2002), pp. 111–116. http://dx.doi.org/10.1016/S0921-4534(01)01062-0[Crossref]
• [4] K. Knížek et al.: “Synthesis of HgBa2CuO4+δ by sol-gel method under controlled oxygen pressure; electron and thermal transport properties”, Physica C, Vol. 302, (1998), pp. 290–298. http://dx.doi.org/10.1016/S0921-4534(98)00200-7[Crossref]
• [5] D. Sedmidubský et al.: “Phase equilibria in the Hg-Ba-Cu-O system”, Physica C, Vol. 329, (2000), pp. 191–197. http://dx.doi.org/10.1016/S0921-4534(99)00577-8[Crossref]
• [6] Y.Y. Xue et al.: “Hg vapor pressure, phase stability, and synthesis of Hg1−x Ba2Can−1CunO2n+2+δ with n ≤ 3”, Physica C, Vol. 281, (1997). pp. 11–16. http://dx.doi.org/10.1016/S0921-4534(97)00376-6[Crossref]
• [7] T. Tsuchiya and K. Fueki: “Chemical thermodynamics of the Hg1212 phase”, Physica C, Vol. 288, (1997), pp. 47–56. http://dx.doi.org/10.1016/S0921-4534(97)01495-0[Crossref]
• [8] T. Tsuchiya, K. Fueki and T. Koyama: “Chemical thermodynamics of Hg1201 and Hg1223 phases”, Physica C, Vol. 298, (1998), pp. 49–58. http://dx.doi.org/10.1016/S0921-4534(98)00039-2[Crossref]
• [9] V.A. Alyoshin et al.: “Mercury nonstoichiometry of the Hg1-x Ba2CuO4+δ superconductor and the P(Hg)-P(O2)-T phase diagram of the Hg-Ba-Cu-O system”, Physica C, Vol. 383, (2002), pp. 59–74. http://dx.doi.org/10.1016/S0921-4534(02)01270-4[Crossref]
• [10] R. Masini et al.: “Magnetic behavior and transport properties of Hg-1201 prepared by vapor-solid reaction”, Appl. Phys. Lett., Vol. 68, (1996), pp. 2282–2284. http://dx.doi.org/10.1063/1.115885[Crossref]
• [11] S. H. Yun et al.: “Growth of HgBa2Ca2Cu3O8+δ thin films on LaAlO3 substrates using fast temperature ramping Hg-vapor annealing”, Appl. Phys. Lett., Vol. 68, (1996), pp. 2565–2567. http://dx.doi.org/10.1063/1.116185[Crossref]
• [12] Y. Moriwaki et al.: “Fabrication and properties of c-axis Hg-1223 superconducting thin films”, Physica C, Vol. 303, (1998), pp. 65–72. http://dx.doi.org/10.1016/S0921-4534(98)00247-0[Crossref]
• [13] W. N. Kang, R. L. Meng and C. W. Chu: “Growth of HgBa2Ca2Cu3O8 thin films using stable Re0.1Ba2Ca2Cu3Ox precursor by pulsed laser deposition”, Appl. Phys. Lett., Vol. 73, (1998), pp. 381–383. http://dx.doi.org/10.1063/1.121841
• [14] Š. Chromik et al.: “CeO2 buffer layers on R-plane Al2O3”, Acta Physica Slovaca, Vol. 50, (2000), pp. 403–409.
• [15] Š. Chromik et al.: “The influence of (102) sapphire substrate on structural perfection of CeO2 thin films”, Physica C, Vol. 371, (2002), pp. 301–308. http://dx.doi.org/10.1016/S0921-4534(01)01098-X[Crossref]
• [16] M. Španková et al: “Growth and recrystallization of CeO2 thin films deposited on R-plane sapphire by off-axis RF sputtering”, J. of Cryst. Growth, Vol. 218, (2000), pp. 287–293. http://dx.doi.org/10.1016/S0022-0248(00)00585-6[Crossref]
• [17] Š. Chromik et al.: “Hg-cuprate thin films prepared using Re and fluorides based precursor thin films”, J. de Physique, Vol. 11, (2001), pp. 175–180.
• [18] Š. Chromik et al.: “(Hg, Re)Ba2CaCu2O6+δ films on CeO2/sapphire substrate using sputtered precursor films”, In: Applied Superconductivity 2003, Proc. of the 6th EUCAS, Sorrento 2003, IoP Conf. Ser. No 181, pp. 1508–1513.
• [19] A. Sin, P. Odier and M. Núnez-Regueiro: “Sol-gel processing of precursor for high-TC superconductors: influence of rhenium on the synthesis of Ba2Ca2Cu3Ox”, Physica C, Vol. 330, (2000), pp. 9–18. http://dx.doi.org/10.1016/S0921-4534(99)00583-3[Crossref]
• [20] M. Valeriánová et al.: “Do mercury superconducting films grown by vapour phase or by bulk mass transfer?”, Physica C, Vol. 435, (2006), pp. 31–36. http://dx.doi.org/10.1016/j.physc.2006.01.013[Crossref]
• [21] D. De Barros, Thesis (DSc.), INPG, Grenoble France, April 2004.
• [22] O. Chmaissem et al.: “Effect of Re substitution on the defect structure, and superconducting properties of (Hg1-x Rex)Ba2Can-1CunO2n+2+δ (n = 2, 3, 4)”, Physica C, Vol. 292, (1997), pp. 305–314. http://dx.doi.org/10.1016/S0921-4534(97)01746-2[Crossref]
• [23] A. Fukuoka et al.: “Dependence of TC and transport properties on the Cu valence in HgBa2Can-1CunO2(n+1)+δ (n = 2, 3) superconductors”, Phys. Rev. B, Vol. 55, (1997), pp. 6612–6620. http://dx.doi.org/10.1103/PhysRevB.55.6612[Crossref]

Identifiers

DOI

10.2478/s11534-007-0021-x