Universal linear relation between the critical field and the inverse susceptibility for Co-based Laves-phase metamagnets

Itinerant-electron metamagnetism and susceptibility maximum behavior in several kinds of Laves-phase compounds

“…In connection with such a shape of the DOS in these compounds, a broad maximum in the temperature dependence of magnetic susceptibility χ i.e. χ maximum behavior is observed [12,15,17]. Such a finite temperature behavior has been explained by the free energy renormalized by spin fluctuations [16,18].…”

Universal relation between the critical field of metamagnetic transition and the susceptibility maximum

“…r It is well known that Laves phase compounds YCo 2 and LuCo 2 exhibit a magnetic field-induced transition from the paramagnetic state to the ferromagnetic one at low temperature, which is so-called itinerant electron metamagnetic transition (MT) [1]. These compounds show also a broad maximum in the temperature dependence of the susceptibility.For many Co-based itinerant-electron metamagnets a universal linear relation between the observed results of the critical field B C of MT at low temperature and the inverse of susceptibility maximum wðT max Þ À1 was found [2]. Here, T max is the temperature where the susceptibility reaches a maximum.…”

“…For many Co-based itinerant-electron metamagnets a universal linear relation between the observed results of the critical field B C of MT at low temperature and the inverse of susceptibility maximum wðT max Þ À1 was found [2]. Here, T max is the temperature where the susceptibility reaches a maximum.…”

“…Curve (1) shown in Fig. 1 is the magnetization curve MðBÞ for a 0 c 0 =b 2 0 ¼ 3 16 : This is just the boundary between the ferromagnetic state and the metamagnetic one at T ¼ 0: In the case of 3 16 oa 0 c 0 =b 2 0 o 9 20 ; MðBÞ shows an anomalous curve, as shown by curve (2) in Fig. 1…”

Itinerant-electron metamagnetism and onset of weak ferromagnetism in laves phase Y(Co1−xGax)2 compounds

“…Since both w max and the metamagnetic transition phenomena are attributed to the characteristic Co-band structure such as a sharp peak in the density of states (DOS) curve lies just below the Fermi level [6]. It is important to note that there is a universal relation between w max À1 and m 0 H C at 0 K among Co-based Laves compounds [7] and U-based compounds [8]. According to the universal relation, the values of m 0 H C of x ¼ 0:02 and 0.06 are estimated to be about 70 and 50 T, respectively.…”