High field magnetization of TiBe2 and related compounds

Abstract

Magnetization measurements at 1.8, 4.2 and 9.6 K at fields up to 19 tesla on the intermetallic Laves phase compound TiBe2 reveal a non linear behaviour of the susceptibility : the magnetization increases at first faster than the magnetic field up to 7 T and then curves towards the field axis. By comparison the compounds Ti(Be0.95Cu0.05)2 and Ti(Be0.9Cu0.1)2 display a ferromagnetic character whereas the compound Ti(Be0.99Cu0.01) 2 appears less magnetic than TiBe2, We infer from these facts that TiBe2 is a very strongly exchange enhanced paramagnet and compare it with Pd and YCo2

Magnetization measurements of nearly ferromagnetic compounds TiBe 2-xMx (M = Cu, Ag, Au, Fe) in low and high fields

“…No detailed theoretical or experimental study of the changes in the electronic structure of TiBe2 caused by the introduction of Cu is available yet. Moreover, the situation is obscured by the discrepancy between our magnetization data [8,1 ] and those of Monod et al and Felner et al [6,11 ]. We found in [8] that the low field, low-temperature susceptibility, x(0, 0), of TiBe2-xCux compounds increases regularly from x = 0 through x = 0.012, 0.05, 0.10, etc... By contrast the susceptibility reported in [6] and [11] for x = 0.02 and x = 0.03 is roughly two times smaller than that of TiBe2.…”

“…The magnetic properties of TiBe2, the susceptibility of which goes through a maximum for both increasing magnetic field and increasing temperature, are not yet fully elucidated [1]. This cubic (C 15) compound has been recently described as an antiferromagnet [2,3], a metamagnet [4,5] and -for the time being the prevailing view -as a strongly exchange enhanced paramagnet [6,7,8].…”

“…Derived compounds such as TiBe2-xMx may also show remarkable properties. A striking feature is the occurrence of ferromagnetism in TiBe2-xCux [9,8,6,10,11] ] for x > 0.16 [8]. No detailed theoretical or experimental study of the changes in the electronic structure of TiBe2 caused by the introduction of Cu is available yet.…”

High-field magnetization of the 3d heavy-fermion system LiV2O4 ( 0, 0.08)

“…Several nearly-FM metals exhibit metamagnetic behavior as well as a maximum in χ [21]. Such examples are YCo 2 [22], TiBe 2 [23], and Co(S,Se) 2 [30]. Recently, metamagnetic behavior has also been reported in the metallic oxide Sr 3 Ru 2 O 7 around H = 5 T [31].…”

“…Hence, the metamagnetic behavior observed in LiV 2 O 4 is not attributed to a spin-flopping. Alternatively, metamagnetic behavior out of a paramagnetic state has been observed in such cases as: (i) Kondo-lattice systems like CeRu 2 Si 2 [17], CeCu 6 [18,19] or YbCuAl [20], and (ii) itinerant-electron systems close to ferromagnetic (FM) order [21] like YCo 2 [22] or TiBe 2 [23]. Notably, both the two models, Kondo-lattice and nearly-FM metal, have been used to explain the anomalous physical properties of LiV 2 O 4 .…”