Observation of dendritic flux instabilities in YNi2B2C thin films

Wimbush, S. C.; Holzapfel, B.; Jooss, Ch.
September 2004
Journal of Applied Physics;9/15/2004, Vol. 96 Issue 6, p3589
Academic Journal
Magneto-optical imaging and magnetization measurements performed on thin films of the borocarbide superconductor YNi2B2C reveal the occurrence of magnetic flux instabilities upon reducing the applied magnetic field towards the remanent state. In contrast to other low-Tc materials such as Nb and MgB2, where similar instabilities occur in both increasing and decreasing magnetic fields, dendritic flux patterns are observed in YNi2B2C for decreasing fields only. Also in the magnetization measurements, a distinct asymmetry is evident between increasing and decreasing fields. The effect does not depend on the sweep rate of the field, but is strongly dependent on the maximum field applied before reduction. The observation of spontaneous flux instabilities in this additional family of low-temperature superconductors suggests that the responsible mechanism is universal to this class of materials.


Related Articles

  • Hysteretic control of organic conductance due to remanent magnetic fringe fields. Macià, F.; Wang, F.; Harmon, N. J.; Wohlgenannt, M.; Kent, A. D.; Flatté, M. E. // Applied Physics Letters;1/28/2013, Vol. 102 Issue 4, p042408 

    Manipulation of the remanent (zero external magnetic field) magnetization state of a single ferromagnetic film is shown to control the room-temperature conductance of an organic semiconductor thin film deposited on top. For the organic semiconductor Alq3, the magnetic fringe fields from a...

  • Bending of magnetic avalanches in MgB2 thin films. Albrecht, J.; Matveev, A. T.; Djupmyr, M.; Schütz, G.; Stuhlhofer, B.; Habermeier, H.-U. // Applied Physics Letters;10/31/2005, Vol. 87 Issue 18, p182501 

    The penetration of magnetic flux into a superconductor above the lower critical field does not necessarily happen in a regular way. It is found that under particular conditions, a chaotic penetration in form of magnetic avalanches occurs. These avalanches are closely related to the so-called...

  • Anistropic photoinduced magnetism of a RbjCok[Fe(CN)6]l·nH2O thin film. Park, J.-H.; Čižmár, E.; Meisel, M. W.; Huh, Y. D.; Frye, F.; Lane, S.; Talham, D. R. // Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3797 

    A magneto-optically active thin film of RbjCok[Fe(CN)6]l·nH2O has been prepared using a sequential assembly method. Upon irradiation with light and at 5 K, the net magnetization of the film increased when the surface of the film was oriented parallel to the external magnetic field of 0.1 T....

  • Considerable increase in the thermomagnetic stability of multifilament superconductors internally doped by large-heat-capacity substances. Keilin, V. E.; Kovalev, I. A.; Kruglov, S. L.; Shutova, D. I.; Scherbakov, V. I. // Technical Physics;Feb2010, Vol. 55 Issue 2, p312 

    It is demonstrated that the thermomagnetic stability of composite superconductors can be considerably increased by introducing into them a small quantity of a material with an extremely high specific heat at low temperatures. Measurements show that the criterion of “adiabatic”...

  • Condensed-matter physics: Opposite of a superconductor. Fazio, Rosario // Nature;4/3/2008, Vol. 452 Issue 7187, p542 

    The article reflects on a study that focused on the collective behaviour of titanium nitride in thin films. According to the author, the researchers described a startling example of such behaviour called superinsulation. The state of infinite resistance observed by them was not confined to...

  • Exchange biasing of ferromagnetic Cr-doped GaN using a MnO overlayer. Liu, H. X.; Wu, Stephen Y.; Singh, R. K.; Newman, N. // Journal of Applied Physics;8/15/2005, Vol. 98 Issue 4, p046106 

    We report the observation of an exchange biasing of ferromagnetic Cr-doped GaN films by an antiferromagnetic MnO overlayer. The center of the magnetic hysteresis loop shifts to a negative magnetic field by ∼70 Oe when measured after a positive field cooling. An enhancement of the coercive...

  • Disorder Tuned Superconductor Insulator Transition in La2− x(Sr/Ce) xCuO4 & NbN Superconducting Thin Films. Vanacken, J.; Zhang, G.; Wambecq, T.; Moshchalkov, V. V.; Leridon, B.; Jin, K.; Zhao, B. R.; Zhu, B. Y.; Raychaudhuri, P.; Chockalingam, S. P.; Chand, M.; Jesudasan, J. // Journal of Superconductivity & Novel Magnetism;Jul2010, Vol. 23 Issue 5, p807 

    In studying the magneto-resistivity ρ( B) in high pulsed magnetic fields up to 55 T, it is often observed that the ρ( B) curves for different temperatures in the vicinity of the critical temperature cross at the same field value, B= B CP. We show how the crossing field changes as a...

  • Inhomogeneous magnetization of a superconducting film measured with a gradiometer. Stalzer, H.; Cosceev, A.; Sürgers, C.; v. Löhneysen, H.; Brosi, J.-M.; Chakam, G.-A.; Freude, W. // Applied Physics Letters;3/1/2004, Vol. 84 Issue 9, p1522 

    The magnetic flux generated by the screening currents of a superconducting Nb film in the Meissner state is measured with a coaxial gradiometer in a weak magnetic field B. A peculiar position dependence is found when the sample surface is only slightly tilted away from the parallel field...

  • Electric-field-induced insulator–metal transition in Pr[sub 0.5]Ca[sub 0.5]MnO[sub 3] thin films in ramp-type junctions. Murakami, T.; SakaI, J.; Imai, S. // Journal of Applied Physics;11/15/2003, Vol. 94 Issue 10, p6549 

    A large decrease in the electrical resistance of the junction was observed with an applied voltage of several volts in small area ramp-type junctions, YBa[sub 2]Cu[sub 3]O[sub 7-δ]/Pr[sub 0.5]Ca[sub 0.5]MnO[sub 3-z]/SrRuO[sub 3]. The lowest resistivity of the Pr[sub 0.5]Ca[sub 0.5]MnO[sub...


Read the Article


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

Try another library?
Sign out of this library

Other Topics