Novel MOCVD approach to the low pressure in situ growth of TlBa2CaCu2O7 films

Properties, magnetic susceptibility, critical currents and irreversibility fields of (Tl0.5Pb0.5)Sr2(Ca1−xGdx)Cu2Ozbulk superconductors

“…The Tlbased family of cuprate superconductors includes different phases with one (Tl(Ba, Sr) 2 Ca n Cu n+1 O 2n+4.5+δ ) or two Tl layers (Tl 2 (Ba, Sr) 2 Ca n Cu n+1 O 2n+6+δ ). Examples are Tl-1223 [2][3][4][5][6][7][8][9][10], Tl-2212 [11][12][13][14][15], Tl-2223 [16] and Tl-1212 [17][18][19][20].…”

(Tl0.5Pb0.5)(Sr0.95Ba0.05)2(Ca0.8Gd0.2)Cu2Oz1212 superconducting films on lanthanum aluminate

“…Chromium containing (thallium, bismuth)-based 1212 films were made by pulsed laser deposition [10,11]. The preparation of TlBa 2 CaCu 2 O 7 films via MOCVD synthesis [12] and the enhancement of superconductivity in TlBa 2 CaCu 2 O x thin films prepared by magnetron sputtering and by varying the oxygen content [13] have been reported as well.…”

Fabrication of TlBa2CaCu2O7c‐Axis Oriented Films Through a Hybrid In‐Situ MOCVD Process

“…Thin films of the TlBaCaCuO family have been usually prepared through ex-situ synthetic procedures involving the initial deposition of a precursor film containing Ba, Ca, and Cu, followed by a high-temperature annealing process of the matrix, carried out in a different reactor, under exposure to Tl 2 O vapors. These c-axis oriented films have been obtained on a variety of commercially available substrates, such as SrTiO 3 , LaAlO 3 , NdGaO 3 , YSZ (yttria stabilized zirconia), MgO, or on buffer layers such as CeO 2 , SrTiO 3 , and Sr 2 AlTaO 6 . The best combination of HTS material and substrate strongly depends on the specific end-use, thus the substrate choice is actually driven by the final application requirements.…”

“…Very preliminary results have shown the feasibility of an in-situ MOCVD approach to TlBaCaCuO film fabrication. [20] Nevertheless, accurate knowledge of the precursor vaporization and deposition processes is of fundamental relevance for the optimization of the present route in the production of uniform and reproducible films.…”