RT Journal Article T1 Invar effect in fcc-FeCu solid solutions A1 Gorria, Pedro A1 Martínez Blanco, David A1 Blanco, Jesús A. A1 Hernando Grande, Antonio A1 Garitaonandia, José S. A1 Fernández Barquín, Luis A1 Campo, Javier A1 Smith, Ronald I. AB Both Cu and Fe metals, with face-centered cubic (fcc) crystal structures, are nonmagnetic. However, the substitution of Cu atoms by Fe in the fcc-Cu lattice leads to the formation of a random solid solution and the appearance of ferromagnetic order, with a value of the magnetic moment per Fe atom in a fcc environment even above 2µ_ß. This striking behavior is closely related to magnetovolume effects (Invar), which we have detected by means of lattice thermal expansion and magnetization measurements in FeCu alloys. PB American Physical Society SN 1098-0121 YR 2004 FD 2004-06 LK https://hdl.handle.net/20.500.14352/52099 UL https://hdl.handle.net/20.500.14352/52099 LA eng NO ©2004 The American Physical SocietyThe work was partially supported by the Research Grants No. MAT2002-04178-C04 and No. MAT2000-1047 and by EU under IHP programme. We also thank the ILL and the CRG-D1B, together with ISIS for the allocation of neutron beam time, and the SCT at the University of Oviedo for the high resolution XRD facility. D.M.-B. thanks Spanish MCyT for additional support. NO EU under IHP programme NO MEC DS Docta Complutense RD 30 dic 2025