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(a) Mechanically controlled break-junction device in magnetic field H. The device can be rotated around the center axis. (b) Conductance vs. piezo voltage of a polycrystalline yttrium wire during opening and closing the contact in zero magnetic field at T = 4.2 K. Inset shows a semilogarithmic plot of in the tunneling regime when closing the contact. (c) in a magnetic field = 1 T applied parallel to the wire. Grey curve represents the data obtained in H = 0 with the piezo voltage shifted by −1.6 V for better comparison.
Conductance curves vs. electrode distance for (a,b) polycrystalline, (c,d) a-, and (e,f) c-axis oriented dysprosium wires in zero field and in magnetic field applied parallel or perpendicularly to the long wire axis. Grey lines represent the midpoints between the curves for opening and closing.
Calculated contact shapes according to the model of Ref. 17. (a)-(c) Double-logarithmic plot of the plastic deformation length vs. . Light-color lines represent data in zero field, dark-color lines represent data obtained in magnetic field, cf. Fig. 2. Dashed lines indicate . (d)-(f) Contact shape in parallel and perpendicular magnetic field.
(a)-(c) Magnetization curves M(H) of Dy wires in magnetic fields oriented parallel and perpendicularly to the long wire axis. (d) Calculated anhysteretic M(H) and (e) curves (solid lines) for different stresses . Broken lines indicate the experimental M(H) curve of the polycrystalline Dy wire in parallel magnetic field.
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