Influence of the d-electron concentration on the itinerant electron metamagnetism and ferromagnetism in M(Co1-xAlx)2 systems (M = Y, Lu): study of compounds with unvariable crystal cell parameter

Effect of Magnetic Phase Transition on the Electronic Specific Heat Coefficient of Lu(Co1−xAlx)2

“…The Co moment is nearly the same as that of the ferromagnetic state for x 5 0.07, which is attained beyond a metamagnetic transition by applying a high field [2, 31. The Curie temperature also increases rapidly with increasing x for x 2 0.1 and reaches a maximum value of 150 K around x = 0.15 [2].…”

“…LuCo, is a well-known compound as a strongly exchangeenhanced Pauli paramagnet with a maximum in the susceptibility versus temperature curve [l]. By the substitution of A1 for Co, the susceptibility increases and the system shows an itinerant electron metamagnetism under high fields for 0.04 5 x 5 0.08 [2,31. Beyond x = 0.08, Co atoms abruptly have a spontaneous magnetic moment of 0 .…”

X-ray magnetic circular dichroic spectrum at theKedge of the transition metal inR−Tintermetallics and its relationship with the magnetism of the rare earth

“…[42][43][44][45] The substitution of Co by nonmagnetic Al in YCo 2 and LuCo 2 Pauli paramagnets, also induces ferromagnetic order. [36][37][38][39][40] In Lu͑Al 0.1 Co 0.9 ͒ 2 , the Co atoms have a magnetic moment of 0.7 B . Hence, as in the Fe case, the strong differences between Lu͑Al 0.1 Co 0.9 ͒ 2 and ErCo 2 cannot be ascribed to different values of the Co moments.…”

“…On the other hand, the substitution of Co by nonmagnetic Al induces ferromagnetic order. [36][37][38][39][40] Within the Y͑Al 1−x Co x ͒ 2 and Lu͑Al 1−x Co x ͒ 2 series, the maximum spontaneous Co magnetic moment, derived from the value of the magnetization at 10 T ͑5 T͒, is Co = 0.3͑0.2͒ B and 0.7͑0.6͒ B for Y͑Al 0.15 Co 0.85 ͒ 2 and Lu͑Al 0.1 Co 0.9 ͒ 2 , respectively. 32 Hence, we have chosen these compounds to analyze the behavior of the K Co XMCD signal when a nonmagnetic rare earth is present.…”

Ferromagnetism of (ScCa)Co2 Laves phase compound synthesized under high pressure

“…The values of T C , dln T C /dP, dln M/dP at 4.2 K and (dln T C /dP)/(dln M/dP) = dln T C /dln M of (Sc 0.85 Ca 0.15 )Co 2 are given in Table 1, together with those of Lu(Co 0.85 Al 0.15 ) 2 and Lu(Co 0.80 Al 0.20 ) 2 Laves compounds which show the second-order magnetic phase transition from the ferromagnetic to the paramagnetic state [9]. In addition, the compounds with x = 0.15-0.16 exhibit the highest T C 130-150 K in Lu(Co 1 − x Al x ) 2 system [9,15]. It should be pointed out that the present compound exhibits the highest T C among the ScCo 2 , YCo 2 and LuCo 2 based quasi-binary compound systems.…”