Neutron Scattering Studies ofY1−xUx

Quantum Critical Scaling and the Origin of Non-Fermi-Liquid Behavior inSc1−xUxPdWilson1, Dai2, Adroja3 et al. 2005Phys. Rev. Lett.Self Cite25190View full textAdd to dashboardCite

“…Similar !=T scaling was first identified in the NFL UCu 5ÿx Pd x system, but with much smaller energy range [21,22]. The key difference, however, is that Sc 0:65 U 0:35 Pd 3 does not have any enhancement in the magnetic scattering around the expected AF ordering vector of higher U concentrations [18]. While the antiferromagnetism in Y 1ÿx U x Pd 3 compounds with x 0:41 may not control the spin dynamics for Sc 0:65 U 0:35 Pd 3 , our results are consistent with the observation that the spin-glass transition temperatures of the NFL x 0:35 and 0.3 compounds are suppressed close to T 0 K [15].…”

“…1(c), the magnetic excitations are broad, temperature independent, and extend up to 50 meV. If excitations from the U moments in the x 0:35 compound have localized states at 6 meV and 36 meV as in the AF ordered Y 0:55 U 0:45 Pd 3 [18,19], one can calculate the expected temperature dependence of the CEF levels assuming either ÿ 5 [18] or ÿ 3 [19] as the zero-energy ground state [ Fig. 2(c)].…”

“…If the single-ion based two-channel quadrupolar Kondo effect (QKE) is responsible for the NFL behavior in Y 0:8 U 0:2 Pd 3 [1], the U 4 ground state should be a nonmagnetic ÿ 3 with magnetic ÿ 5 and ÿ 4 excited states [5]. In contrast, polarized triple-axis neutron-scattering experiments on Y 1ÿx U x Pd 3 reveal a magnetic ground state for x 0:45 and possibly for x 0:2, thus precluding the possibility of a QKE [18]. However, based on subsequent neutron time-of-flight measurements, Bull et al [19] argue that the ÿ 3 doublet ground state is more consistent with the x 0:45 data and the x 0:2 compound has a degenerate ÿ 3 and ÿ 5 ground state.…”

Interplay between magnetism and non-Fermi-liquid behavior inSc1−xUxDickey1, Zapf2, Ho3 et al. 2003Phys. Rev. BSelf Cite6150View full textAdd to dashboardCite

“…The ground state of Y 1Ϫx U x Pd 3 has been in-vestigated by several groups by means of neutron-scattering experiments. [7][8][9] According to Lea, Leask, and Wolf, 10 the U 4ϩ ninefold degenerate Jϭ4 Hund's rule multiplet is split in the presence of a cubic crystalline electric field ͑CEF͒ into ⌫ 4 and ⌫ 5 triplets, a ⌫ 1 singlet, and a ⌫ 3 doublet. Initially, the ground state of Y 0.8 U 0.2 Pd 3 was determined to be a nonmagnetic ⌫ 3 , with magnetic ⌫ 5 and ⌫ 4 excited states at 5 and 16 meV, respectively.…”

Metallurgical and low-temperature electronic properties ofM1−xUxPd<

“…The SG/AFM phase boundary has been established through electrical resistivity, magnetization, specific heat, and neutron diffraction measurements. 10,11 In the SG regime, the magnetization is irreversible, with irreversibility temperatures T irr that increase with increasing x, according to magnetization 12 and SR 13 measurements. Neutron diffraction measurements by Dai et al 11 revealed AFM ordering for the compound Y 0.55 U 0.45 Pd 3 , with a Néel temperature T N of 21 K and an ordered moment of 0.7 B per U atom.…”