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503 results on '"Kohlstedt H"'

159. Ferromagnetic 0–π Josephson junctions

Author

Weides, M., primary, Kohlstedt, H., additional, Waser, R., additional, Kemmler, M., additional, Pfeiffer, J., additional, Koelle, D., additional, Kleiner, R., additional, and Goldobin, E., additional

Published
2007
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163. Low-temperature dynamics of ferroelectric domains in PbZr0.3Ti0.7O3 epitaxial thin films studied by piezoresponse force microscopy.

Author

Andreeva, N. V., Vakulenko, A. F., Petraru, A., Soni, R., Kohlstedt, H., Filimonov, A. V., Rudskoy, A. I., Vakhrushev, S. B., and Pertsev, N. A.

Subjects
LOW temperatures, DOMAIN boundaries, FERROELECTRIC materials, ATOMIC force microscopy, PIEZORESPONSE force microscopy
Abstract

Dynamics of domain boundaries is expected to change drastically at low absolute temperatures but direct experimental information for this temperature range is still lacking. To clarify the mechanism of low-temperature domain dynamics, we studied the growth of ferroelectric domains in the temperature range 4.2-295K using the out-of-plane piezoresponse mode of a cryogenic atomic force microscope (AFM). Nanoscale 180° domains were created in epitaxial PbZr0.3Ti0.7O3 films by applying short voltage pulses between the conductive AFM tip brought into contact with the bare film surface and the bottom LaSr0.7Mn0.3O3 electrode. A quantitative analysis of acquired piezoresponse images enabled us to determine the in-plane domain size as a function of the writing voltage and pulse duration. It is found that at all studied temperatures the dependence of this size on the pulse duration can be fitted by a logarithmic function, which indicates that the domain-wall velocity exponentially depends on the driving electric field. The theoretical analysis of experimental data shows that the observed low-temperature domain dynamics is consistent with the creep of domain boundaries occurring in the presence of defects and structural nanoheterogeneities. [ABSTRACT FROM AUTHOR]

Published
2015
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167. Publisher's Note: “Ferroelectric thin films: Review of materials, properties, and applications” [J. Appl. Phys. 100, 051606 (2006)]

Author

Setter, N., primary, Damjanovic, D., additional, Eng, L., additional, Fox, G., additional, Gevorgian, S., additional, Hong, S., additional, Kingon, A., additional, Kohlstedt, H., additional, Park, N. Y., additional, Stephenson, G. B., additional, Stolitchnov, I., additional, Taganstev, A. K., additional, Taylor, D. V., additional, Yamada, T., additional, and Streiffer, S., additional

Published
2006
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177. Size effects in ultrathin epitaxial ferroelectric heterostructures

Author

Nagarajan, V., primary, Prasertchoung, S., additional, Zhao, T., additional, Zheng, H., additional, Ouyang, J., additional, Ramesh, R., additional, Tian, W., additional, Pan, X. Q., additional, Kim, D. M., additional, Eom, C. B., additional, Kohlstedt, H., additional, and Waser, R., additional

Published
2004
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190. Dynamic behavior of Josephson-coupled layered structures

Author

Kleiner, R., Müller, P., Kohlstedt, H., Pedersen, Niels Falsig, Sakai, S., Kleiner, R., Müller, P., Kohlstedt, H., Pedersen, Niels Falsig, and Sakai, S.

Abstract

We have investigated Josephson effects in stacks of both artificial and natural Josephson junctions. The measurements have been performed on Nb/Al-AlO(x)/Nb multilayers and on small single crystals of Bi2Sr2CaCu2O8. Both systems exhibit multiple branched I-V characteristics in zero magnetic field. In finite magnetic fields coupling via currents flowing along the superconducting layers is essential, since the layers are thinner than the London penetration depth. All observations are in good agreement with numerical simulations of stacks of coupled Josephson junctions. These simulations predict that a large number of junctions can be phase locked in large magnetic fields via Fiske resonances excited in all junctions.

Published
1994

191. Theory and experiment on electromagnetic-wave-propagation velocities in stacked superconducting tunnel structures

Author

Sakai, S., Ustinov, A. V., Kohlstedt, H., Petraglia, Antonio, Pedersen, Niels Falsig, Sakai, S., Ustinov, A. V., Kohlstedt, H., Petraglia, Antonio, and Pedersen, Niels Falsig

Abstract

Characteristic velocities of the electromagnetic waves propagating in vertically stacked Josephson transmission are theoretically discussed. An equation for solving n velocities of the waves in an n Josephson-junction stack is derived. The solutions of two- and threefold stacks are especially focused on. Furthermore, under the assumption that all parameters of the layers are equal, analytic solutions for a generic N-fold stack are presented. The velocities of the waves in two- and three-junction stacks by Nb-Al-AlOx-Nb systems are experimentally obtained by measuring the cavity resonance (Fiske step) modes. Comparison of the theory with the experimental data reveals good quantitative agreement.

Published
1994

192. Voltage controlled biaxial strain in VO2 films grown on 0.72Pb(Mg1/3Nb2/3)-0.28PbTiO3 crystals and its effect on the transition temperature.

Author

Petraru, A., Soni, R., and Kohlstedt, H.

Subjects
VANADIUM, THIN film research, VANADIUM oxide, PIEZOELECTRICITY, PHYSICS research
Abstract

Vanadium oxide thin films (VO2) were deposited on 0.72Pb(Mg1/3Nb2/3)-0.28PbTiO3 (PMN-PT) crystalline substrates using pulsed laser deposition method. Due to their huge piezoelectric coefficients in the order of 2500 pm/V, the PMN-PT substrates are used to impose additional amount of biaxial strain to the VO2 films by applying an external bias to the substrates. The influence of the biaxial strain on the transition temperature and on the conductive properties of the VO2 films is investigated in this work. Thus, a change in the biaxial strain of -0.8 x 10-3 applied in the (110) plane of the rutile cell of the VO2 lowered the metal-to-insulator transition temperature by 1.35 °C. [ABSTRACT FROM AUTHOR]

Published
2014
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194. Narrow long Josephson junctions

Author

Koval, Yu., primary, Wallraff, A., additional, Fistul, M., additional, Thyssen, N., additional, Kohlstedt, H., additional, and Ustinov, A.V., additional

Published
1999
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