Search

Your search keyword '"Jansen, A.G.M."' showing total 318 results
Start Over Author "Jansen, A.G.M."
318 results on '"Jansen, A.G.M."'

15. Superconducting phase diagram of single-crystal MgB 2

Author

Welp, U., Rydh, A., Karapetrov, G., Kwok, W.K., Crabtree, G.W., Marcenat, C., Paulius, L.M., Lyard, L., Klein, T., Marcus, J., Blanchard, S., Samuely, P., Szabo, P., Jansen, A.G.M., Kim, K.H.P., Jung, C.U., Lee, H.-S., Kang, B., and Lee, S.-I.

Published
2003
Full Text
View/download PDF

36. Magnetotransport properties of La(sub 2/3)Sr(sub 1/3)MnO(sub 3) thin film

Author

Mandal, P., Choudhury, P., Barner, K., von Helmolt, R., and Jansen, A.G.M.

Subjects
Magnetoresistance -- Analysis, Ferromagnetism -- Analysis, Magnetic fields -- Analysis, Thin films -- Analysis, Thin films -- Properties, Dielectric films -- Analysis, Dielectric films -- Properties, Physics
Abstract

The temperature and magnetic field dependence of the resistivity of La(sub 2/3)Sr(sub 1/3)MnO(sub 3) thin film over a wide temperature range and in high magnetic fields up to 20 T are reported. The extended Mott hopping conduction model was used to describe the ferromagnetic (FM) transition and the field dependence of the magnetoresistance (MR).

Published
2002

42. Evidence for superconductivity and a pseudogap in the new magnetic compound PrAg₆In₆

Author

Dmitriev, V.M., Rybaltchenko, L.F., Wyder, P., Jansen, A.G.M., Prentslau, N.N., and Suski, W.

Subjects
Свеpхпpоводимость, в том числе высокотемпеpатуpная, Condensed Matter::Superconductivity
Abstract

Direct evidence for superconductivity in the new magnetic compound PrAg₆In₆ is revealed for the first time. The distinct Andreev-reflection current is observed in metallic point contacts (PC) based on this compound. The data obtained provide reason enough to suggest that the rise of superconductivity strongly depends on the local magnetic order varying over the sample volume. The triangular-shaped PC spectra (dV/dI V ( )) in the vicinity of the zero-bias voltage suggest an unconventional type of superconducting pairing. As follows from the temperature and magnetic field dependences of the PC spectra, the superconducting energy gap structure transforms into the pseudogap one as the temperature or the magnetic field increases.

Published
2005

43. Coulomb blockade-based nanothermometry in strong magnetic fields.

Author

Pekola, J.P., Toppari, J.J., Kauppinen, J.P., Kinnunen, K.M., Manninen, A.J., and Jansen, A.G.M.

Subjects
COULOMB functions, MAGNETIC fields, SCIENTIFIC experimentation
Abstract

Provides information on experiments performed to test the susceptibility to strong magnetic fields of electron tunneling in normal metal-based nanostructures for Coulomb blockade primary thermometry. Methodology used to conduct the experiments; Description of the fabrication of the Coulomb blockade primary thermometry (CBT); Suppression of superconductivity in CBT arrays; Results of the experiments.

Published
1998
Full Text
View/download PDF

44. Anisotropy of the Upper Critical Field and Critical Current in Single Crystal MgB$_2$

Author

Lyard, L., Samuely, P., Szabo, P., Klein, Thierry, Marcenat, C., Paulius, L., Kim, K.H.P., Jung, C.U., Lee, H.-S., KANG, B., Choi, S., Lee, S.-I., Marcus, J., Blanchard, S., Jansen, A.G.M., Welp, U., Karapetrov, G., Kwok, W.K., Laboratoire d'Etudes des Propriétés Electroniques des Solides (LEPES), Université Joseph Fourier - Grenoble 1 (UJF)-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), Service de Physique Statistique, Magnétisme et Supraconductivité (SPSMS - UMR 9001), Institut Nanosciences et Cryogénie (INAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), University J.Fourier, Centre of Low Temperature Physics IEP SAS (CLTP), Slovak Academy of Science [Bratislava] (SAS), NVCRICS, Pohang University of Science and Technology (POSTECH), Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G), Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Material Science Division [ANL] (MSD), Argonne National Laboratory [Lemont] (ANL), Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique de Grenoble (INPG)-Université Joseph Fourier - Grenoble 1 (UJF), Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées

Subjects
74.25.Bt, 74.25.Dw, 74.60.Ec, [PHYS.COND.CM-S]Physics [physics]/Condensed Matter [cond-mat]/Superconductivity [cond-mat.supr-con], Superconductivity (cond-mat.supr-con), Condensed Matter - Superconductivity, FOS: Physical sciences
Abstract

We report on specific heat, high magnetic field transport and $ac-$susceptibility measurements on magnesium diboride single crystals. The upper critical field $H_{c2}$ for magnetic fields perpendicular and parallel to the Mg and B planes is presented for the first time in the entire temperature range. A very different temperature dependence has been observed in the two directions which yields to a temperature dependent anisotropy with $\Gamma \sim$ 5 at low temperatures and about 2 near $T_c$. A peak effect is observed in susceptibility measurements for $H \sim $2 T parallel to the $c-$axis and the critical current density presnts a sharp maximum for $H$ parallel to the ab-plane., Comment: 6 pages, 5 figures

Published
2002
Full Text
View/download PDF

45. Direct evidence for the occurrence of superconductivity in the magnetic compound YFe₄Al₈

Author

Rybaltchenko, L.F., Wyder, P., Jansen, A.G.M., Dmitriev, V.M., Prentslau, N.N., and Suski, W.

Subjects
Свеpхпpоводимость, в том числе высокотемпеpатуpная, Condensed Matter::Superconductivity
Abstract

For the first time we present the direct evidence for superconductivity in the ternary magnetic compound YFe₄Al₈ with the ThMn₁₂ type structure found via point-contact (PC) experiments on contacts between silver needle and single-crystal YFe₄Al₈, revealing the distinct Andreev-reflection current. The spectra measured prove the existence of normal-superconducting interface and exhibit the triangular-like shape in a vicinity of zero-bias voltage, inferring the unconventional type of superconductivity. The derived dependences of the order parameter versus temperature Δ(T) and m agnetic field Δ(H) are presented. Δ(T) follows BCS theory, whereas Δ(H) do not satisfy any theoretical predictions. In some cases there exists noticeable superconductivity enhancement by a weak magnetic field. The data obtained imply the v ery inhomogeneous distribution of superconductivity over the sample volume in spite of its single crystal structure. We assume that the reason is associated with inherent magnetic inhomogeneities of this material. The highest values for the critical temperature Tc, upper critical magnetic field Hc₂, and ratio 2Δ(0)/kTc are 7.4 K, 5 T, and 7.2, respectively.

Published
2002

46. Magnetoresistance anisotropy in Si/SiGe in tilted magnetic fields: Experimental evidence for a stripe-phase formation

Author

Zeitler, U., Schumacher, Hans W., Jansen, A.G.M., and Haug, Rolf J.

Subjects
Morphology, Semiconducting silicon compounds, Physics::Instrumentation and Detectors, Magnetoresistance, Band structure, Stripe-phase formation, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Electron transport properties, Molecular orientation, Condensed Matter::Materials Science, Semiconducting silicon, Fermi level, Heterojunctions, ddc:530, Condensed Matter::Strongly Correlated Electrons, Carrier mobility, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, Magnetic anisotropy, Landau levels
Abstract

The anisotropies induced by an in-plane field in the magnetotransport properties of coinciding Landau levels in the two dimensional electron system of a silicon/silicon germanium (Si/SiGe) heterostructure were investigated. The anisotropies were caused by the formation of a unidirectional stripe phase from two Landau levels with opposite spin of electrons.

Published
2001
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results