Magnetic orderings and temperature dependence of the hysteresis loops of Nb1−xFe2+x

Turtelli, R. Sato; Sinnecker, J.P.; Größinger, R.; Pentón-Madrigal, A.; Estévez-Rams, E.

doi:10.1016/j.jmmm.2007.02.197

Cited by 17 publications

(18 citation statements)

References 5 publications

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“…The ZFC-FC curves separate exactly at T N , whereas in the stoichiometric ͑y =0͒ sample a clear separation only occurred well below T N . 31 This might indicate spinglass behavior. However, as in the stoichiometric sample, we did not observe any shift of the Ј maximum at T N with measurement frequency.…”

Section: Sdw and Fm Mixed Phase: 0 յ Y յ 002mentioning

confidence: 99%

Magnetism inNb1−yFe2+y: Composition and magnetic field dependence

et al. 2009

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We present a systematic study of transport and thermodynamic properties of the Laves phase system Nb 1−y Fe 2+y . Our measurements confirm that Fe-rich samples, as well as those rich in Nb ͑for ͉y͉ Ն 0.02͒, show bulk ferromagnetism at low temperature. For stoichiometric NbFe 2 , on the other hand, magnetization, magnetic susceptibility, and magnetoresistance results point toward spin-density wave ͑SDW͒ order, possibly helical, with a small ordering wave vector Q ϳ 0.05 Å −1 . Our results suggest that on approaching the stoichiometric composition from the iron-rich side, ferromagnetism changes into long-wavelength SDW order. In this scenario, Q changes continuously from 0 to small, finite values at a Lifshitz point in the phase diagram, which is located near y = +0.02. Further reducing the Fe content suppresses the SDW transition temperature, which extrapolates to zero at y Ϸ −0.015. Around this Fe content magnetic fluctuations dominate the temperature dependence of the resistivity and of the heat capacity which deviate from their conventional Fermi-liquid forms, inferring the presence of a quantum critical point. Because the critical point is located between the SDW phase associated with stoichiometric NbFe 2 and the ferromagnetic order which reemerges for very Nb-rich NbFe 2 , the observed temperature dependences could be attributed both to proximity to SDW order or to ferromagnetism.

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Section: Sdw and Fm Mixed Phase: 0 յ Y յ 002mentioning

confidence: 99%

Magnetism inNb1−yFe2+y: Composition and magnetic field dependence

et al. 2009

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“…Such loops are often seen in disordered magnets and ferroelectrics, see, for example, Refs. [23]- [25]. As we see the ends of m = m(n, t, h) curves at which metastable states loose their stability may be thought of as the upper and lower branches of the loop while the top and the bottom of the loop are bounded by the m 0 (h) curve.…”

Section: Metastable States and Hysteresis Loopsmentioning

confidence: 89%

Phenomenological theory of nonergodic phenomena in dipole- and spin-glasses

Timonin

2009

Eur. Phys. J. B

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The path-dependent magnetizations (polarizations) and susceptibilities in dipole-and spin-glasses are described analytically for the standard protocols of temperature and field variations using the phenomenological Landau-type description of multiple metastable states in the nonergodic phases. The immediate manifestation of metastable states' multiplicity as staircases of magnetizations (polarizations) curves in the temperature cycling experiments is explained and described. The obtained results are in a reasonable qualitative agreement with the existing experimental data.

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“…A large uniform susceptibility χ places all samples close to the threshold of ferromagnetism, whereas strongly fielddependent anomalies in the heat capacity point at spindensity-wave order below 10 K in stoichiometric Fe 2 Nb, thus indicating an intriguing interplay between ferromagnetism and antiferromagnetism. Investigations of the magnetic properties of Fe 2 Nb were also performed very recently by Sato Turtelli et al [15], which showed that the ordered state of the stoichiometric Fe 2 Nb is a spin density wave and both ferro-and antiferromagnetic spin fluctuations coexist. The antiferromagnetism is suppressed by offstoichiometry and the ferromagnetism on the Fe-rich side develops much faster than that on the Nb-rich side.…”

Section: Originalmentioning

confidence: 94%

“…The persistence of magnetized atomic clusters up to temperatures well above the FM transition, correlated by antiferromagnetic couplings and monotonically decreasing with increasing temperature may be responsible for this magnetic irreversibility. It is worth mentioning that very recent investigations indicate an intriguing interplay between ferromagnetism and antiferromagnetism in Fe 2 Nb [14,15], and have shown that antiferromagnetism in stoichiometric Fe 2 Nb is really very sensitive to the external field and in high field both the ferro-and antiferromagnetism are close to instability. It is also noteworthy to mention that the earlier statement that the Laves phase in these systems is nonmagnetic was concluded from measurements in samples with lower solute content, and for which a lattice shrink has been observed [12].…”

Section: Figure 2 Field-cooled (Fc) and Zero-field-cooled (Zfc) M(t)mentioning

confidence: 97%

Observation of weak ferromagnetism in the C14 Laves phase of the (Fe_1–xNi_x)₂Nb system

Paduani

Schaf

Persiano

et al. 2009

Physica Status Solidi (b)

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In this work we report the observation of weak ferromagnetism in the hexagonal C14 Laves phase (s.g. P63/mmc) of the (Fe1–x Nix)2Nb system, which has been reported as nonmagnetic in the literature. A larger unit cell volume is observed as compared to Fe2Nb. From low‐temperature magnetization measurements it is found that the Ni substitution for Fe indeed leads to the onset of a weak ferromagnetic ordering in the C14 Laves phase of this pseudobinary system. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Magnetic orderings and temperature dependence of the hysteresis loops of Nb1−xFe2+x

Cited by 17 publications

References 5 publications

Magnetism inNb1−yFe2+y: Composition and magnetic field dependence

Magnetism inNb1−yFe2+y: Composition and magnetic field dependence

Phenomenological theory of nonergodic phenomena in dipole- and spin-glasses

Observation of weak ferromagnetism in the C14 Laves phase of the (Fe_1–xNi_x)₂Nb system

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Magnetic orderings and temperature dependence of the hysteresis loops of Nb1−xFe2+x

Cited by 17 publications

References 5 publications

Magnetism inNb1−yFe2+y: Composition and magnetic field dependence

Magnetism inNb1−yFe2+y: Composition and magnetic field dependence

Phenomenological theory of nonergodic phenomena in dipole- and spin-glasses

Observation of weak ferromagnetism in the C14 Laves phase of the (Fe1–xNix)2Nb system

Contact Info

Product

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Observation of weak ferromagnetism in the C14 Laves phase of the (Fe_1–xNi_x)₂Nb system