Magnetoresistance in ErCo2 and HoCo2 single crystals

Differential scanning calorimetry experiments in RCo2

“…This behavior is in agreement with the lack of anisotropy of the coexistence curve in HoCo 2 described in Ref. [8]. The origin of these two peaks as well as the minor peak in ErCo 2 is not yet fully understood, although the microstructure of the sample may be at the origin of this phenomenon.…”

Balancing structural distortions via competing 4f and itinerant interactions: a case of polymorphism in magnetocaloric HoCo2

“…35 Magnetostriction constants, l 100 and l 111 , are À2.2 Â 10 À3 and À0.5 Â 10 À3 , respectively. 10 41 Large values of magnetic entropy (DS M ) and adiabatic temperature (DT ad. ) change were obtained for HoCo 2 : for a magnetic field change from 0 to 8 T, DS M = À8 J mol À1 K À1 (À28.3 J kg À1 K À1 ) and DT ad.…”

Irreversibility of the magnetic state ofTm1−xTbxCo2revealed by specific heat, electrical resistivity, and neutron diffract

“…9 For ErCo 2 , fieldinduced metamagnetic transition and well-defined shortrange magnetic correlations were also observed above T C by neutron diffraction measurements. 10 As shown by measurements on single-crystalline samples of ErCo 2 and HoCo 2 , 11 application of a magnetic field just above T C leads to a step like increase of the magnetization and giant reduction of the electrical resistivity due to the field-induced first-order phase transition. The first-order type of the magnetic phase transition at T C in RCo 2 ͑R = Er, Ho, and Dy͒ and the second-order type in TbCo 2 and GdCo 2 , having higher Curie temperatures ͑T C Ͼ 200 K͒, was explained by Bloch et al 12 and Inoue and Shimizu 13 by the suggestion of identity of the electronic structures of all compounds RCo 2 .…”