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URu2Si2 displays a pronounced phase transition to an unidentified (hidden) form of order at 17.5K. Below 1.45K, a temperature well below the onset of the hidden order, URu2Si2 develops heavy-fermion superconductivity. As a function of pressure large moment antiferromagnetism develops, while the superconductivity is suppressed. We report measurements of the DC magnetization as well as neutron scattering of the magnetic properties and lattice constants through the pressure induced transition from hidden order to large moment antiferromagnetism. These measurements shed new light on the possible interplay of the hidden order with heavy-fermion superconductivity and antiferromagnetism in URu2Si2.
* in collaboration with P. Niklowitz, T. Keller, J. Mydosh, S. Dunsiger and P. Link |
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