Low-temperature magnetic properties of GdCoIn5

DIANA BETANCOURTH; JORGE I. FACIO; PABLO PEDRAZZINI; C.B.R. JESUS; P.G. PAGLIUSO; V. VILDOSOLA; PABLO S. CORNAGLIA; D.J. GARCÍA; V.F. CORREA

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2014 vol. 374 p. 744 - 747

0304-8853

A comprehensive experimental and theoretical study of the low temperature properties of GdCoIn 5 was performed. Specific heat, thermal expansion, magnetization and electrical resistivity were measured in good quality single crystals down to 4 He temperatures. All the experiments show a second-order-like phase transition at 30 K probably associated with the onset of antiferromagnetic order. The magnetic susceptibility shows a pronounced anisotropy below T N with an easy magnetic axis perpendicular to the crystallographic ĉ-axis. Total energy GGA þU calculations indicate a ground state with magneticmoments localized at the Gd ions and allowed a determination of the Gd-Gd magnetic interactions. Band structure calculations of the electron and phonon contributions to the specific heat together with Quantum Monte Carlo calculations of the magnetic contributions show a very good agreement with the experimental data. Comparison between experiment and calculations suggests a significant anharmonic contribution to the specific heat at high temperature (T≳100 K).