The magnetic phase diagram of Gd(2)Sn(2)O(7)

Measurements of the magnetic susceptibility of the frustrated pyrochlore magnet Gd(2)Sn(2)O(7) have been performed at temperatures below T = 5 K and in magnetic fields up to H = 12 T. The phase boundaries determined from these measurements are mapped out in an H-T phase diagram. In this gadolinium compound, where the crystal-field splitting is small and the exchange and dipolar energy are comparable, the Zeeman energy overcomes these competing energies, resulting in at least four magnetic phase transitions below 1 K. These data are compared against those for Gd(2)Ti(2)O(7) and will, we hope, stimulate further studies.FAPESP[08/00457-2]Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)CNPq-Brazil[471188/2008-5]Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)National Science Foundation (NSF)[DMR-0944772]U.S. National Science Foundation (NSF