Specific Heat and Magnetic Structure of GdT2X2 Compounds (T = Cu, Ni, X = Sn, Sb) |
| K. Kaczmarskaa, J. Pierreb, D. Schmittb, B. Lambert-Andronc, R. Belllisentd and A. Guzika aInstitute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland bL. Néel Laboratory, CNRS, 38042 Grenoble, France cCrystallographic Laboratory, CNRS, 38042 Grenoble, France dL. Brillouin Laboratory, CEA, Saclay, France |
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| The magnetic specific heat of GdNi2Sn2, GdNi2Sb2 and GdCu2Sb2 shows a λ-type anomaly at TN with a noticeable reduction of the discontinuity compared to that expected for a simple antiferromagnet. It can be associated with the existence of amplitude modulated magnetic structure just below TN. Above TN a weak magnetic contribution is observed, evidencing the short-range ordering. From neutron diffraction studies it can be also concluded that investigated compounds have not simple antiferromagnetic structures. For GdNi2Sn2 the propagation vector Q=(0.3,1/2,1/2) was found with the magnetic moments along the [1,0,0] axis. |
| DOI: 10.12693/APhysPolA.92.347 PACS numbers: 75.25.+z, 75.40.-s, 75.50.Ee |