12186-42-4Relevant articles and documents
Low temperature specific heat of laves phase AFe2 compounds (A = Nb, Ta and Ti)
Wada, Hirofumi,Hada, Masayo,Shiga, Masayuki,Nakamura, Yoji
, p. 701 - 705 (1990)
The low temperature specific heats of nearly ferromagnetic NbFe2 and TaFe2 and antiferromagnetic TiFe2 have been studied between 1.4 K and 6.5 K. The results are compared with the recent band calculations. It is shown that the electronic specific heat coefficients, γ, of NbFe2 and TaFe2 are significantly enhanced. The enhancement of γ of NbFe2is discussed in terms of the spin fluctuation theory.
Quantum criticality in the frustrated Laves phase compound NbFe2
Klementowicz, Dennis Moroni,Burrell, Richard,Fort, David,Grosche, Malte
, p. 80 - 82 (2005)
Geometric frustration in nearly magnetic metals provides a promising and relatively little explored path to obtaining high electronic densities of states - the hatching condition of novel quantum order. Various geometrically frustrated compounds close to the border of magnetism can be found amongst the intermetallic C14 and C15 Laves phases and we have selected NbFe2 as one of the more interesting examples. We report on measurements of the DC magnetisation, AC magnetic susceptibility, specific heat capacity and electrical resistivity in off-stoichiometric Nb1-yFe2+y (y?-0.04). Our sample is classified as a strongly enhanced Pauli paramagnet with anomalous resistivity power-law behaviour: the low-temperature electrical resistivity follows the form ρ=ρ0+ATα with 1a wide range and returns to the quadratic temperature dependence expected from Fermi Liquid theory in its simplest form only below 500 mK. The absolute magnitude of the measured low-temperature heat capacity is inconsistent with a model based solely on proximity to ferromagnetism and suggests a significant contribution from antiferromagnetic fluctuations.
Magnetic transitions in Nb1-yFe2+y
Crook,Cywinski
, p. 71 - 72 (1995)
DC magnetisation has been used to map the magnetic phase diagram of Nb1-yFe2+y between -0.04 y 0.04. The effects of coexisting and competing ferromagnetic and antiferromagnetic spin correlations are evident.
