Magnetic properties, electronic structures and pressure effects of HoxY1−xCo2 compounds

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

“…8c, below. According to the pressure-dependent study by Burzo et al, 47 volume contraction in the magnetically ordered state leads to a smaller Co moment, which agrees with the fact that the increase in the net magnetization coincides with the decrease of the unitcell volume at T SR . The change of the c/a ratio can also affect the magnetic moment.…”

“…The change of the c/a ratio can also affect the magnetic moment. 47 Our own theoretical investigation presented below clearly confirms that the structural transformation is the primary reason for the reduction of Co moment below T SR .…”

“…2a) is by itself an interesting yet rarely discussed phenomenon. It has been observed not only in HoCo 2 but also in mixed rare-earth alloys like Ho 0.7 Y 0.3 Co 2 , 47 and even though the size of this anomaly decreases with increasing magnetic field strength it is present in 60 kOe field as well (Fig. 2b).…”

Sequential Cobalt Magnetization Collapse in ErCo2: Beyond the Limits of Itinerant Electron Metamagnetism

“…3). The ordered cobalt magnetic moments determined at 10 K as well as the extrapolated values at T = 0, decrease with a pressure rate dM Co /dP = −0.1 μ B GPa −1 , similar to that in relevant RCo 2 compounds (R = Tb, Ho)1415. The relation , resulting from the data above, describes well the experimentally determined T c (Co) values – Table 2.…”

“…The value of internal magnetic field can be tuned by variation of R element or its content, substitution at cobalt sites11, application of external high pressure or magnetic field. The formation of the Co magnetic ordering leads to pronounced drop in resistivity of RCo 2 compounds, and their macroscopic magnetic and transport properties were extensively studied during last years upon variation of R element type, external pressure and magnetic field112131415. However, microscopic mechanisms driving formation of magnetic properties remain unclear.…”