Magnetic fields (IMAGE)

National Institute for Materials Science, Japan

Magnetic fields

Caption

(a) Change in sheet resistance (electrical resistivity per unit area of material surface)--an indicator of a superconducting transition--as a function of temperature and magnetic field. (b) Change in critical magnetic field measured with multiple samples as a function of temperature. Critical magnetic fields parallel to samples' surfaces exceeded the generally accepted theoretical value (5.5-5.8 T). They are expected to reach 16-20 T at the absolute zero temperature. Critical magnetic fields vertical to the samples' surfaces are also shown for comparison (scaled by a factor of 10 for clarity).

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