Superconductivity in La-doped strontium titanate thin films

Olaya, David; Feng Pan; Rogers, Charles T.; Price, Jonn C.
May 2004
Applied Physics Letters;5/17/2004, Vol. 84 Issue 20, p4020
Academic Journal
We report on the superconductivity of lanthanum-doped SrTiO3 thin films grown by off-axis laser ablation on LaAlO3, SrTiO3, and NdGaO3 substrates in oxygen partial pressures ranging from 10-8 T to 21 mTorr. The La/Sr doping ratio of the ablation target was 1%. The resulting films have carrier densities measured in the range of 6.5-30 × 1019 cm-3 independent of temperature from room temperature to 4 K and low-temperature mobilities as high as 130 cm²/V s. Critical temperatures range between 356 down to about 48 mK depending on oxygen partial pressure during growth. Measurements of superconductive transitions in a magnetic field suggest a value of the electronic effective mass around 4.5 times the free electron mass.


Related Articles

  • Study of electrical properties of pulsed excimer laser deposited strontium titanate films. Rao, G. Mohan; Krupanidhi, S. B. // Journal of Applied Physics;3/1/1994, Vol. 75 Issue 5, p2604 

    Employs a pulsed laser ablation process for the development of device quality strontium titanium oxide thin films. Nonuniformity in thickness across the diameter of the substrate due to the directionality of the ablated material; Nature of crystallinity in perovskite thin films; Dielectric...

  • Superconductivity and transport behavior of laser ablated Au-added.... Pinto, R.; Apte, P.R. // Applied Physics Letters;2/12/1996, Vol. 68 Issue 7, p1006 

    Investigates the superconductivity and transport behavior of laser ablated gold-added YBa[sub 2]Cu[sub 3]O[sub 7-delta] (YBCO) thin films. Dependence of grain size on growth temperature and laser pulse energy; Details on the critical current density and transition temperature of the films;...

  • Electrical conductivity of sputtered films of strontium titanate. Gerblinger, Josef; Meixner, Hans // Journal of Applied Physics;6/15/1990, Vol. 67 Issue 12, p7453 

    Studies the electrical conductivity of sputtered thin films of strontium titanate. Previous studies on the electrical conductivity of strontium titanate; Preparation of the thin films; Properties of the sputtered films.

  • Meyer-Neldel rule in amorphous strontium titanate thin films. Morii, K.; Matsui, T.; Tsuda, H.; Mabuchi, H. // Applied Physics Letters;10/9/2000, Vol. 77 Issue 15 

    In this letter, we report the experimental result indicating that the electrical conductivity in thin films of amorphous strontium titanate (a-STO) is well fit to the Meyer-Neldel (MN) rule over the temperature range 300-470 K. The films were ion-beam sputtered and annealed in two different...

  • Growth by laser ablation of Ti-based oxide films with different valency states. Morcrette, M.; Gutiérrez-Llorente, A.; Laurent, A.; Perrière, J.; Barboux, P.; Boilot, J.P.; Raymond, O.; Brousse, T. // Applied Physics A: Materials Science & Processing;1998, Vol. 67 Issue 4, p425 

    Abstract. Thin films of the Li[sub x]La[sub 2/3+y]TiO[sub 3-delta] perovskite (with delta less than or equal to 0.5) were deposited by the laser ablation technique from Li[sub 0.33]La[sub 0.56]TiO[sub 3] targets. Their growth onto MgO substrates was studied as a function of the oxygen pressure....

  • c-oriented SrBi[sub 2]Nb[sub 2]O[sub 9] films grown on YBa[sub 2]Cu[sub 3]O[sub 7-d] /SrTiO[sub 3] and NdGaO[sub 3]. Boikov, Yu. A.; Pronin, I. P.; Shaplygina, T. A.; Ivanov, Z. G.; Claeson, T.; �rts, D. // Physics of the Solid State;Apr97, Vol. 39 Issue 4, p598 

    Epitaxial SrBi[sub 2]Nb[sub 2]O[sub 9] films were grown by laser ablation on (001)YBa[sub 2]Cu[sub 3]O[sub 7-d]/(100)SrTiO[sub 3] and (001)NdGaO[sub 3], with c axis normal to the substrate plane. The SrBi[sub 2]Nb[sub 2]O[sub 9] films were grown in a layer-by-layer regime on NdGaO[sub 3]...

  • Leakage current characteristics of laser-ablated SrBi[sub 2]Nb[sub 2]O[sub 9] thin films. Das, Rasmi R.; Bhattacharya, P.; Pe´rez, W.; Katiyar, Ram S.; Bhalla, A. S. // Applied Physics Letters;7/29/2002, Vol. 81 Issue 5, p880 

    We have studied the leakage current conduction mechanism of pulsed-laser-deposited SrBi[sub 2]Nb[sub 2]O[sub 9] (SBN) thin films on platinized silicon substrates. The time-dependent dc leakage current densities of SBN thin films do not follow Curie-von Schweidler power law. Instead the...

  • Highly tunable SrTiO3/DyScO3 heterostructures for applications in the terahertz range. Kuzˇel, P.; Kadlec, F.; Petzelt, J.; Schubert, J.; Panaitov, G. // Applied Physics Letters;12/3/2007, Vol. 91 Issue 23, p232911 

    Several types of multilayer structures based on SrTiO3 and DyScO3 thin films were prepared by laser ablation. The dielectric properties of these samples without and under applied static or low-frequency electric field at room temperature were determined in the terahertz spectral range by...

  • Conductive thin films of bis(ethylenedithio)tetrathiafulvalene salt fabricated by a successive.... Miura, Yasuhiro F.; Ohnishi, Satomi // Applied Physics Letters;4/22/1996, Vol. 68 Issue 17, p2447 

    Details the fabrication of conductive molecular thin films of a BEDT-TTF [bis(ethylenedithio)tetrahiafulvalene] salt by a successive dry wet process. Evaporation of neutral BEDT-TTF molecules; Administration of an electrochemical doping process; Range of the lateral conductivity of the film;...


Read the Article


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

Try another library?
Sign out of this library

Other Topics