Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 53: Magnetic Scattering Methods
MA 53.4: Vortrag
Freitag, 11. März 2016, 10:15–10:30, H33
Avoided ferromagnetic criticality in PrPtAl — •Dmitry Sokolov1,2, Andrew Huxley1, and Frank Krueger3,4 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2School of Physics & Astronomy, The University of Edinburgh, UK — 3ISIS, STFC, Rutherford Appleton Laboratory, Chilton, UK — 4London Centre for Nanotechnology, University College London, London, UK
Our recent work on induced moment ferromagnet PrPtAl provided a first experimental evidence for intermediate electronic states, which precede the conventional q=0 ferromagnetism when the ferromagnetic transition temperature is close to zero. Using the neutron diffraction and synchrotron X-ray scattering we have shown that with decreasing temperature PrPtAl undergoes a transition from paramagnetic state into a doubly modulated incommensurate spin density wave (SDW), followed by a second transition at lower temperature in to a single incommensurate SDW of a different period before transitioning into a commensurate ferromagnetism at the lowest temperatures [1]. This finding represents the first new paradigm for understanding the transition from paramagnetism to ferromagnetism since the formulation of the theory of the continuous phase transitions by L. D. Landau in 1937.
[1] G. Jabbar, D. A. Sokolov, C. O' Neill, C. Stock, D. Wermeille, F. Demmel, F. Krueger, A. G. Green, F. Levy-Bertrand, B. Grenier, and A. D. Huxley, Nat. Phys. 11, 321 (2015).