Critical Phenomena and the Quantum Critical Point of Ferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Zr</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Nb</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Zn</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Sokolov, Dmitry; Aronson, M. C.; Gannon, W. J.; Fisk, Z.

doi:10.1103/physrevlett.96.116404

Cited by 61 publications

(50 citation statements)

References 42 publications

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“…7 Perhaps not as surprising, nonmagnetic element doping also resulted in the suppression of the Curie temperature T C . 8 The similarity between the magnetic and nonmagnetic doping effects is quite striking but could possibly be explained by the instability of ferromagnetism in ZrZn 2 , as predicted by the band structure with a narrow peak at the Fermi surface. 6,9 For Sc 3 In, the peak in the density of states at the Fermi level was found to be broader than that of ZrZn 2 .…”

Section: Introductionmentioning

confidence: 91%

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Svanidze

Morosan

2013

Phys. Rev. B

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In the presented work, Sc 3.1 In, a weak itinerant ferromagnet with no magnetic constituents, is doped with Er 3+ local moment ions, to form (Sc 1−x Er x ) 3.1 In. As x increases, the Weiss-like temperature θ stays positive and nearly triples up to x = 0.10. Moreover, Er doping of as little as x = 0.02 induces a cluster-glass state, which persists up to x = 0.10, as evidenced by dc and ac susceptibility measurements, and confirmed by the Vogel-Fulcher analysis.

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Section: Introductionmentioning

confidence: 91%

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Svanidze

Morosan

2013

Phys. Rev. B

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“…It is generally believed that ferromagnetic order occurs at T = 0 via a discontinuous or first order transition, as is observed in the clean ferromagnets ZrZn 2 (7) and MnSi (8) under pressure. Disorder is known to render the ferromagnetic transition continuous, leading to the mean field behavior that is found when doping drives T C = 0 in Ni 1−x Pd x (9), Zr 1−x Nb x Zn 2 (10), and Nb 1−y Fe 2+y (11). More controversial is the possibility that strong quantum fluctuations, such as those that destabilize order in low-dimensional systems, may be significant near the T C = 0 ferromagnetic transition and perhaps may even destroy its first-order character (5).…”

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confidence: 99%

“…Mean field theories predict that the collapse of ferromagnetic order is via a first-order transition (5,6) in the absence of disorder or by a continuous mean field transition in the presence of disorder (7)(8)(9)(10). According to ref.…”

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confidence: 99%

Quantum critical fluctuations in layered YFe ₂ Al ₁₀

Kim

Park

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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The absence of thermal fluctuations at T = 0 makes it possible to observe the inherently quantum mechanical nature of systems where the competition among correlations leads to different types of collective ground states. Our high precision measurements of the magnetic susceptibility, specific heat, and electrical resistivity in the layered compound YFe 2 Al 10 demonstrate robust field-temperature scaling, evidence that this system is naturally poised without tuning on the verge of ferromagnetic order that occurs exactly at T = 0, where magnetic fields drive the system away from this quantum critical point and restore normal metallic behavior.quantum criticality | ferromagnet | dynamical scaling T he interplay of competing interactions is responsible for the array of ground states that are possible in correlated electron systems. It is of particular importance to understand how one such ground state gives way to another when the system is tuned at temperature T = 0, without the complications of thermal fluctuations. Consequently, much interest has focused on quantum critical points (QCPs), where an ordered phase can be created by an infinitesimal modifications of pressure, composition, or field. The onset of ferromagnetic order is perhaps the simplest T = 0 phase transition, and indeed much experimental and theoretical effort has been directed toward understanding its essential features (1-6). It is generally believed that ferromagnetic order occurs at T = 0 via a discontinuous or first order transition, as is observed in the clean ferromagnets ZrZn 2 (7) and MnSi (8) under pressure. Disorder is known to render the ferromagnetic transition continuous, leading to the mean field behavior that is found when doping drives T C = 0 in Ni 1−x Pd x (9), Zr 1−x Nb x Zn 2 (10), and Nb 1−y Fe 2+y (11). More controversial is the possibility that strong quantum fluctuations, such as those that destabilize order in low-dimensional systems, may be significant near the T C = 0 ferromagnetic transition and perhaps may even destroy its first-order character (5). A complete experimental investigation of the critical phenomena and their scaling behaviors in a carefully selected system where disorder is minimal is needed to establish that quantum critical fluctuations are both present and relevant to the destabilization of ferromagnetic order.Progress toward obtaining this information has been painstaking, although a number of systems have been identified where the Curie temperature T C has been driven to zero. High pressure experiments evade the disorder that necessarily accompanies doping, but thus far only resistivity and susceptibility measurements have been reported. Complete experimental access is possible when doping is used to suppress T C → 0, but even small amounts of compositional inhomogeneity can obscure any intrinsic critical fluctuations of T C = 0 ferromagnetic transitions, resulting in interesting complications such as the Griffiths phase (12,13,14), as well as short ranged order, including spin glasses (15). Alterna...

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“…It is well established that pressure or field can drive magnetic ordering to T=0, via a first or second order transition [24][25][26][27][28] . Other compounds have singular temperature dependencies in specific heat and magnetic susceptibility [29][30][31][32][33][34][35] that signal their proximity to a QCP, although the use of doping to approach the QCP can replace the intrinsic critical fluctuations with mean field behavior 27,36,37 . Competing orders such as superconductivity in the cuprates 38 and the spin nematic phase in Sr 3 Ru 2 O 7 16 have masked much of their experimental phase space, making a clear demonstration of quantum critical behavior challenging.…”

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confidence: 99%

Field-tuned Fermi liquid in quantum critical YFe2Al10

Park

Janssen

et al. 2011

Phys. Rev. B

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We present here measurements of the magnetization M, ac susceptibility χ ′ , electrical resistivity ρ, and specific heat C in single crystals of metallic YFe2Al10. The magnetic susceptibility follows a Curie-Weiss temperature dependence for 75 K≤T≤750 K, with a fluctuating Fe moment of 0.45 µB/Fe, and the ac susceptibility χ ′ diverges at lower temperatures χ ′ ∼T −1.28±0.04 when the ac field is in the basal plane. The field B and temperature T dependencies of the magnetization M are well described by the scaling expression MT −β =F(B/T β+γ ) for 1.8 K≤T≤30 K and for fields larger than 0.1 T. These results indicate that strong quasi-two dimensional critical fluctuations are present that can be suppressed by magnetic fields. The magnetic and electronic parts of the specific heat CM show a similar divergence for 0.4 K≤T≤12 K, where CM /T∼T −0.47±0.03 . The divergences in χ ′ and CM /T indicate that YFe2Al10 is located near a quantum critical point, and no magnetic order is observed above 0.09 K. We argue that our results are inconsistent with quantum impurity or disorder models, suggesting instead that YFe2Al10 is on the verge of bulk magnetic ordering, and that the critical fluctuations that are associated with this quantum critical point lead to the divergencies in CM /T and χ ′ .

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Critical Phenomena and the Quantum Critical Point of FerromagneticZr1−xNbxZn2

Cited by 61 publications

References 42 publications

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Quantum critical fluctuations in layered YFe ₂ Al ₁₀

Field-tuned Fermi liquid in quantum critical YFe2Al10

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Critical Phenomena and the Quantum Critical Point of FerromagneticZr1−xNbxZn2

Cited by 61 publications

References 42 publications

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Cluster-glass behavior induced by local moment doping in the itinerant ferromagnet Sc3.1In

Quantum critical fluctuations in layered YFe 2 Al 10

Field-tuned Fermi liquid in quantum critical YFe2Al10

Contact Info

Product

Resources

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Quantum critical fluctuations in layered YFe ₂ Al ₁₀