Anomalies at the compensation temperature in the zero-magnetization ferromagnet „Sm,Gd...Al2

X. H. Chen,1,2,* K. Q. Wang,1 P. H. Hor,2 Y. Y. Xue,2 and C. W. Chu2,3,† 1Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China 2Department of Physics and Texas Center for Superconductivity and Advanced Materials, University of Houston, Houston, Texas 77204-5002, USA 3Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA and Hong Kong University of Science and Technology, Hong Kong, China Received 14 March 2005; revised manuscript received 5 July 2005; published 24 August 2005