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Thermally activated annihilation of an individual domain in submicrometer nickel particles

Autor: J.G.S. Lok, U Wyder, S. V. Dubonos, J.C. Maan, Andre K. Geim

Publikováno v: Journal of Magnetism and Magnetic Materials, 204, 3, pp. 159-164
Journal of Magnetism and Magnetic Materials, 204, 159-164

We have used the technique of ballistic Hall micromagnetometry to study the annihilation process of an individual domain in sub-micron ferromagnetic nickel disks. The technique allows to detect changes in magnetization as low as 5×10 4 μ B over a w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f86cf63715d42f7452e5eb9b26a29e0
https://doi.org/10.1016/s0304-8853(99)00438-2

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Magnetism and superconductivity of the U(Pt, Pd)3 system

Autor: N.H. van Dijk, U. Wyder, J.J.M. Franse, A. de Visser

Publikováno v: Physica B-Condensed Matter, 223-224, 15-21. Elsevier

The superconducting phase diagram of UPt3 has been studied by a variety of techniques, all leading to three different phases in the B T plane that meet the normal phase in a tetracritical point. Superconductivity has been reported to coexist with sma

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89b5336a81b1a35f5f6428885dd10699
https://doi.org/10.1016/0921-4526(96)00028-2

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Peak effect in the magnetostriction of superconducting NbTi due to elastic constants

Autor: A. de Visser, J.J.M. Franse, J.A.A.J. Perenboom, P. van der Linden, V.H.M. Duyn, H.P. van der Meulen, U. Wyder, Alexander Gerber

Publikováno v: Physica B-Condensed Matter, 211, 1-4, pp. 265-268
Physica B-Condensed Matter, 211, 265-268
Physica B-Condensed Matter, 211, 265-268. Elsevier

The magnetostriction on polycrystalline superconducting NbTi perpendicular to the field is measured to siudy lattice deformation effects caused by fluxoids exerting forces on the lattice through pinning centers. A "dip" for increasing and a "peak" fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c817c3b47789091b3db18f0cf382bd1b
https://doi.org/10.1016/0921-4526(94)01003-j

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High-field studies of the magnetic phase transition of URu2Si2

Autor: A. de Visser, J.A.A.J. Perenboom, A.A. Menovsky, G.J. Nieuwenhuys, U. Wyder, T.E. Mason, S.A.M. Mentink, J. A. Mydosh

Publikováno v: Physica B-Condensed Matter, 230-232, 74-76. Elsevier
Physica B-Condensed Matter, 230, pp. 74-76
Physica B-Condensed Matter, 230, 74-76

We investigate the phase transition of URu2Si2 at T0 = 17.5 K by thermal expansion and heat capacity in magnetic fields, H, up to 25 T. At T0 an energy gap of Δ ⋍ 115 K opens, which decreases to 65 K in 25T. The H dependence of T0 scales with Δ,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b935d1035642409942bd5cabe2fbc83e
https://dare.uva.nl/personal/pure/en/publications/highfield-studies-of-the-magnetic-phase-transition-of-uru2si2(0aa70773-b595-4c81-ba72-67de731f40e5).html

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Spin fluctuations and heavy fermion behavior

Autor: U. Wyder

Publikováno v: Physica B-Condensed Matter, 204, 255-264. Elsevier

A heuristic approach to the relation of spin fluctuations (SF) and the heavy fermion (HF) state will be presented. The appearance of SF in the eigenstates of the periodic Anderson model is discussed in terms of relevant length scales, something alrea

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::73c2d7447827c39646c53132faf24835
https://dare.uva.nl/personal/pure/en/publications/spin-fluctuations-and-heavy-fermion-behavior(ca8b61cd-2c1e-4cd8-8293-a315272ed256).html

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High field dilatation experiments on U(Pt0.95Pd0.05)3; Magnetic ordering versus heavy-fermion behavior

Autor: A.A. Menovsky, A. de Visser, P. van der Linden, J.J.M. Franse, Uli Zeitler, U. Wyder, H.P. van der Meulen, J.A.A.J. Perenboom

Publikováno v: Physica B-Condensed Matter, 206-207, 437-440. Elsevier
Physica B-Condensed Matter, 206, 437-440
Physica B-Condensed Matter, 206, pp. 437-440

A still open question is whether long-range magnetic ordering as observed in some heavy fermion (HF) systems is intimately related to the HF state or is an extra phenomenon interacting with it. This problem might be addressed by studying the compound

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c8bc251d26aa4e20237717d1add592f
https://dare.uva.nl/personal/pure/en/publications/high-field-dilatation-experiments-on-upt095pd0053-magnetic-ordering-versus-heavyfermion-behavior(7ced73e0-42d2-44cc-8ac5-50fbc8657900).html

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Length change experiments on UPt3 in high magnetic fields

Autor: U. Wyder, H.P. van der Meulen, J.J.M. Franse, J.A.A.J. Perenboom, P. van der Linden, A. de Visser, A.A. Menovsky

Publikováno v: Physica B-Condensed Matter, 199, 178-180
Physica B-Condensed Matter, 199, pp. 178-180

We present thermal-expansion and forced-magnetostriction experiments on UPt3 in the temperature range 1.5–17 K and in magnetic fields parallel to the crystallographic a-axis up to 25 T, well above the metamagnetic field, B∗, of 20 T. For this fie

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::313188f4a454a63eb6b19579425d713b
https://doi.org/10.1016/0921-4526(94)91775-2

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Interpretation of atomic friction experiments based on atomistic simulations

Autor: U. Wyder, Roland Bennewitz, Alexis Baratoff, Ernst Meyer, J. David, Lev Kantorovich, Tobin Filleter, Sabine Maier

Publikováno v: Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures. 25:1547

Atomic stick-slip experiments on the KBr(100) surface are analyzed using classical zero temperature atomistic simulations. Three different tip models exhibiting atomic stick-slip movement are studied in comparison with the experimental data and the T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82f323feb5f3a440e968e12f463d97e5
https://doi.org/10.1116/1.2770743

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Thermal expansion and magnetostriction of CePt2Si2

Autor: A. de Visser, M. Zerguine, U. Wyder, D. Schmitt

Publikováno v: Journal of Magnetism and Magnetic Materials. 108:59-60

We have measured the coefficients of linear thermal expansion of a single-crystalline sample of the tetragonal Kondo-lattice compound CePt2Si2 over a wide temperature range (0.3 < T < 220 K). The coefficient of volume expansion exhibits two broad ano

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7957d21e0f60d179817e1a6e7f36eb99
https://doi.org/10.1016/0304-8853(92)91347-v

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