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Polarized neutron scattering has shed a new light on URu 2 Si 2 . This compound studied for almost thirty years presents two tran- sitions: a superconducting state below 1.2K (T sc ) and a well-defined bulk transition at 17.8K (T 0 ). In spite of intensive research, no local probe has defined the order parameter associated with this transition (the famous Hidden Order...
We report a previously unobserved quantum oscillation frequency in YbRh2Si2. This is the first quantum oscillation that can definitely be assigned to the second of the two major sheets of the Fermi surface predicted by band structure calculations. These calculations have been done for two scenarios: the “large” Fermi surface, which includes the Yb 4f‐hole in the Fermi volume, and the “small” Fermi...
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