Spin Fluctuations in(Y0.97Sc0.03)Mn2:

LiV2O4: A Heavy Fermion Transition Metal Oxide

“…No magnetic long-range ordering was observed above 1.4K [16,195]. Similar to LiV204, it shows a large electronic specific heal coefficient 7(0) »; 160-200 mJ/moIK" [16.…”

“…They also observed a thermally-induced contribution, with ^rms = 1.6/iB/Mn at 330 K. Further. Ballou et al [16] inferred from their inelastic neutron scattering experiments the presence of "short-lived 4-site collective spin singlets'", thereby suggesting the possibil ity of a quantum spin-liquid ground state. recent theoretical study by Canals and Lacroi.x [194] by perturbative expansions and exact diagonalization of small clusters of a 5 = 1/2 frustrated pyrochlore antiferromagnet [196] found a spin-liquid ground state and an AF spin correlation length of less than one interatomic distance at T = 0.…”

“…•VF ordering inherent in the \' sublattice of the spinel structure may help to destabilize the local moments in LiV'204 at low T [16] and lead to the FL behavior. …”

“…We find an enormous 7(1 K) « 0.42J/molK-. much larger than those of other metallic transition metal compounds, e.g.. Yi_rScrMn2 (~ 0.2 J/molK* [16]) and V^-yOa (~ 0.07J/molK- [85]). The magni tudes and T-dependences of 7 and \ and the T-dependence of p [3] for LiV204 are remarkably similar to those of the HF /-electron superconductor UPta (Tc = 0.54 K) [33,35,39,86,87].…”

Pressure tuning of competing magnetic interactions in intermetallic CeFe2

“…Many metallic cubic Laves systems exhibit either ferroor antiferromagnetic long range order [7][8][9][10][11][12][13][14] . Ferromagnetic CeFe 2 is close to a magnetic instability and can be switched to an antiferromagnet with either chemical doping or applied pressure.…”