2005
DOI: 10.1088/0953-2048/18/3/020
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Higher harmonics of ac voltage response in narrow strips of YBa2Cu3O7 thin films: evidence for strong thermal fluctuations

Abstract: We report on measurements of higher harmonics of the ac voltage response in strips of

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Cited by 4 publications
(4 citation statements)
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“…20,21 Linear, U , and nonlinear third harmonic, U 3 , ac signals were measured simultaneously using four-probe technique with a "Quantum Design" PPMS system for ac current values J =1-10 3 A in the range of frequencies, =1-10 3 Hz and temperatures, T = 10-400 K, and in-plane magnetic fields B =0-5 T. The low-field ͑B =10 mT͒ magnetization was analyzed with a commercial MPMS superconducting quantum interference device ͑SQUID͒ system for T = 10-400 K. The structure of the films was characterized by x-ray diffraction ͑XRD͒ ͑Siemens D5000͒ and transmission electron microscopy ͑TEM͒ ͑Jeol 4000EX and Jeol 3000F͒. The film samples, prepared by a metalorganic aerosol deposition technique, 22,23 were individual LCMO ͑sample C͒ and LSMO ͑sample S͒ layers ͑x ϳ 0.3͒ as well as LCMO/ BaTiO 3 ͑CB sample͒ multilayer, all grown on MgO͑100͒ substrates.…”
Section: Methodsmentioning
confidence: 99%
“…20,21 Linear, U , and nonlinear third harmonic, U 3 , ac signals were measured simultaneously using four-probe technique with a "Quantum Design" PPMS system for ac current values J =1-10 3 A in the range of frequencies, =1-10 3 Hz and temperatures, T = 10-400 K, and in-plane magnetic fields B =0-5 T. The low-field ͑B =10 mT͒ magnetization was analyzed with a commercial MPMS superconducting quantum interference device ͑SQUID͒ system for T = 10-400 K. The structure of the films was characterized by x-ray diffraction ͑XRD͒ ͑Siemens D5000͒ and transmission electron microscopy ͑TEM͒ ͑Jeol 4000EX and Jeol 3000F͒. The film samples, prepared by a metalorganic aerosol deposition technique, 22,23 were individual LCMO ͑sample C͒ and LSMO ͑sample S͒ layers ͑x ϳ 0.3͒ as well as LCMO/ BaTiO 3 ͑CB sample͒ multilayer, all grown on MgO͑100͒ substrates.…”
Section: Methodsmentioning
confidence: 99%
“…In order to characterize and classify the nonlinearity ratio it is convenient to introduce a coefficient $B = V_{3\omega } /I_{0}^{3} $ , the normalized third‐harmonic amplitude , see, e.g., 32. When the resistance of a sample shows a strong temperature dependence, e.g., at a superconducting or MI transition, the dissipated heat power P = I 2 R ( I ) will induce a nonlinear signal 32–36. At fixed temperatures T , this Joule heating effect leads to resistance oscillations resulting from temperature oscillations T ± Δ T , which in turn results in a characteristic frequency dependence V 3ω ∝ ω −1/2 32, 34, 35, 37.…”
Section: Nonlinear Transportmentioning
confidence: 99%
“…When the resistance of a sample shows a strong temperature dependence, e.g., at a superconducting or MI transition, the dissipated heat power P = I 2 R ( I ) will induce a nonlinear signal 32–36. At fixed temperatures T , this Joule heating effect leads to resistance oscillations resulting from temperature oscillations T ± Δ T , which in turn results in a characteristic frequency dependence V 3ω ∝ ω −1/2 32, 34, 35, 37. Thus, for nonlinear transport measurements, it is important to investigate the current and frequency dependence of V 3 ω .…”
Section: Nonlinear Transportmentioning
confidence: 99%
“…Auch bei der Erforschung der Hoch-T c -Supraleiter kommen dritte harmonische Spannungsmessungen zum Einsatz. Es wird -unter anderem -die Abhängigkeit der Sprungtemperatur vom äußeren Druck T c (P)[133] und der thermische Grenzflächenwiderstand zwischen einer supraleitenden Schicht und dem Substrat bestimmt[134,135]. Der Einfluss von Joulescher Wärme auf die Generierung von höheren harmonischen, elektrischen Signalen kann auch zur Analyse von Defekten bzw.…”
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