Pressure-induced quantum criticality in CePdAl
We propose to conduct a diffraction experiment using polarized neutron beam at three different conditions at low temperatures (< 0.5 K): at ambient pressure in applied magnetic fields of 3 and 6 T (B||c) and (3) at 1 GPa in a field of 6 T (B||c). The first part of the experiment is aiming to determine which Ce moments contribute to magnetization between 3.4 and 4 T and the second should reveal density map at full polarization. Finally, the last part should give us answer how the magnetic form factor is changing under the pressure. This requires the use of dilution refrigerator or He3 fridge, the use of small, clamp-type pressure cell and an application of magnetic fields at the same time. Prior to the experiment we would need to determine structural details of our crystal at low temperatures. Absorption effects of the pressure cell needs to be mapped as well. For the crystal structure determination that include extinction correction, either D9 or D10 (for 2 days) instruments operated in a 4-circle mode is suggested. For the polarized part, either D3 or D23 instrument, with a slight preference of the former one, can be used. We expect that the experiment takes 11 days.
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PROKES Karel; HARTWIG Steffen; RESSOUCHE Eric; STOCKERT Oliver; STUNAULT Anne and WOITSCHACH Sarah. (2013). Pressure-induced quantum criticality in CePdAl. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-51-485
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