When placed next to a bar magnet, an aluminum ball draws gently towards the magnet. In contrast, a ball made of silver moves out of the magnetic field. The mechanisms underlying these different behaviors are known as paramagnetism and diamagnetism, respectively. Surprisingly, the material called BiTeI-composed of layers of bismuth, tellurium and iodine atoms-can be either diamagnetic or paramagnetic, depending on how it is prepared.
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