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Low-Temperature State of UCu5: Formation of Heavy Electrons in a Magnetically Ordered Material
Abstract
The formation of a heavy-electron state in a magnetically ordered material is established by measurements of the low-temperature specific heat of UCu5 and UAgCu4. In UCu5 this state undergoes a continuous but hysteretic phase transition which removes parts of the Fermi surface with a high density of electronic states and leads to a resistivity increase of almost an order of magnitude. © 1985 The American Physical Society.
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