Experiments show that the heavy fermion compound YbRh2Si2 undergoes a spectacular electro-nuclear phase transition into a modulated magnetic state at a temperature as low as 1.5 mK. In a just published paper, an international team of scientists from the UK (Royal Holloway University of London) and Germany (Goethe University Frankfurt, MPI-CPfS Dresden) demonstrated that in YbRh2Si2, at TA = 1.5 mK, the tiny nuclear moments profoundly change an electronic magnetic state formed at a much higher temperature TN = 70.5 mK.
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