Magnetic Phase Transitions in Geometrically Frustrated SrGd2O4
We propose to measure the development of low-temperature magnetism in SrGd2O4 using the hot neutron diffractometer D9 to minimise the absorption due to the Gadolinium ions. SrGd2O4 belongs to a family of compounds with the formula SrLn2O4 (Ln = Lanthanide). The triangular chains of Ln ions along the c-axis make the SrLn2O4 compounds suitable candidates to exhibit geometric frustration. From heat capacity measurements we have established that SrGd2O4 undergoes 2 low temperature phase transitions, TN1 = 2.72 K and then TN2 = 0.47 K. We have also seen the higher temperature (TN1) transition in single crystal susceptibility measurements, and observed a further transition upon the application of a magnetic field suggesting a rich H-T phase diagram for this material. The proposed D9 experiment would allow us to determine the nature of the magnetic phases in zero-field with possible future extensions to in-field measurements.
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PETRENKO Oleg; BALAKRISHNAN Geetha; NENERT Gwilherm and YOUNG Olga. (2012). Magnetic Phase Transitions in Geometrically Frustrated SrGd2O4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-41-700
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