<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>55</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Mn</mml:mi></mml:math>NQR/NMR studies of the magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YMn</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>under pressure

鄭, 国慶; Nishikido, K.; Ohnishi, K.; Kitaoka, Y.; Hauser, Robert G.

doi:10.1103/physrevb.59.13973

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…6,22 However, this value is comparable to the value of YMn 2 in the paramagnetic state. 23,24 Below ϳ50 K, the plots deviate markedly from the straight lines and seem to come on other lines with different slopes. This phenomenon may be related to a marked upturn of the susceptibility on further cooling, and hence to a certain evolution of the electronic state suggested, for example, by muon spin relaxation measurements.…”

Section: ͑35͒mentioning

confidence: 93%

55MnNMR and NQR study of the cubic Laves-phase compoundUMn2

2000

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We performed 55 Mn NMR and nuclear quadrupole resonance ͑NQR͒ measurements of a cubic Laves-phase compound UMn 2 , which shows structural instability in the temperature range 210-240 K. NMR and NQR signals of two different crystallographic Mn sites, which are in nearly axial and nonaxial electric field gradients, were found below structural transitions, being consistent with the crystal structure determined from diffraction analysis and confirming the absence of magnetic ordering. Analysis of the Knight shift shows that the spin component of the isotropic hyperfine coupling constant does not change at the phase transitions, and the anisotropy of the Knight shift appreciably depends on temperature. The nuclear spin-lattice relaxation is not enhanced except around the structural transitions and is explained as simple conduction-electron relaxation, indicating absence of localized moments at both U and Mn sites. The relaxation behavior also suggests neither critical behavior nor strong electron correlation in the low-temperature range.

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Section: ͑35͒mentioning

confidence: 93%

55MnNMR and NQR study of the cubic Laves-phase compoundUMn2

2000

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“…In particular, a strong hyperfine field exerted on 55 Mn nuclei [corresponding to δ µ / √ 2 ≃ 1.2 GHz/µ B in Eq. ( 13)] drives the sensitive range of NMR up to such high frequencies 22 . Interestingly, the latest INS study of a singlecrystalline sample (x = 0.03) revealed that the intensity centered at approximately Q 0 = (1.25, 1.25, 0) (in reciprocal lattice units) exhibits anisotropic broadening along the Brillouin zone boundary, which is interpreted to be due to the degeneracy of states associated with geometrical frustration 24 .…”

Section: A Y(sc)mnmentioning

confidence: 99%

“…These spectra were analyzed by curve fitting using Eq. (22), where β = 1 and a p was replaced with A b as the time-independent background mainly originating from muons stopped in the sample holder. The signal-to-background ratio (A 0 /A b ) was ∼3.8 for the 4 He cryostat and ∼3 for the 3 He cryostat over a time range of 0-20 µs, allowing the reliable deduction of λ at small values (∼ 10 −2 µs −1 ).…”

Section: B Ymn 2 Zn 20−x In Xmentioning

confidence: 99%

Quest for the Origin of Heavy Fermion Behavior ind-Electron Systems

2016

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Spin fluctuation is presumed to be one of the key properties in understanding the microscopic origin of heavyfermion-like behavior in the class of transition-metal compounds, including LiV 2 O 4 , Y(Sc)Mn 2 , and YMn 2 Zn 20 . In this review, we demonstrate by our recent study of muon spin rotation/relaxation that the temperature (T ) dependence of the longitudinal spin relaxation rate (λ ≡ 1/T 1 ) in these compounds exhibits a common trend of leveling off to a constant value (λ ∼ const.) below a characteristic temperature, T * . This is in marked contrast to the behavior predicted for normal metals from the Korringa relation, λ ∝ T/ν, where the spin fluctuation rate (ν) in the Pauli paramagnetic state is given as a constant, ν ≃ 1/[hD(E F )] [with D(E F ) being the density of states at the Fermi energy]. Thus, the observed behavior of λ implies that the spin fluctuation rate becomes linearly dependent on temperature, ν ∝ T , suggesting that heavy quasiparticles develop in a manner satisfying D(E F ) ∝ (m * ) σ ∝ 1/T at lower temperatures (σ determined by the electronic dispersion). Considering that the theory of spin correlation for intersecting Hubbard chains as a model of pyrochlore lattice predicts ν ∝ T , our finding strongly indicates the crucial role of t 2g bands which preserve the one-dimensional character at low energies due to the geometrical frustration specific to the undistorted pyrochlore lattice.

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NQRS Data for Mn2Y (Subst. No. 2408)

Chihara¹,

Nakamura²

2010

Substances Containing C10H16 … Zn

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55MnNQR/NMR studies of the magnetic properties ofYMn2under pressure

Cited by 9 publications

References 30 publications

55MnNMR and NQR study of the cubic Laves-phase compoundUMn2

55MnNMR and NQR study of the cubic Laves-phase compoundUMn2

Quest for the Origin of Heavy Fermion Behavior ind-Electron Systems

NQRS Data for Mn2Y (Subst. No. 2408)

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