Ferro- und paramagnetisches Verhalten in den Mischkristallen des Nickels mit Vanadium, Rhodium und Platin im Temperaturbereich von 14° bis 1000°K

Bölling, F.

doi:10.1007/bf02422901

Cited by 15 publications

(9 citation statements)

References 28 publications

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“…T c is then extracted via the mean-field T -dependencies of M 0 (T ) and susceptibility (−c/M 2 0 (T )) [12]. The resulting T c (x) can be simply extrapolated linearly (dashed line) from the high T c = 630K of nickel down to 0 at x ≈ 11% [8].…”

Section: Resultsmentioning

confidence: 99%

“…To avoid additional complications due to the Kondo effect and to study a larger energy scale we recently investigated the simple fcc transition metal alloy Ni 1−x V x [8] as an example of an itinerant ferromagnet (FM) in which the transition temperature (T c = 630K for pure Ni) can be tuned to zero by chemical substitution. As explained by Friedel [9] the "disorder" is introduced arXiv:1006.4094v2 [cond-mat.str-el] 17 Feb 2011 because the charge contrast of the replacing vanadium atoms creates large defects yielding an inhomogeneous magnetization density.…”

Section: Introductionmentioning

confidence: 99%

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Signatures of a quantum Griffiths phase in a d-metal alloy close to its ferromagnetic quantum critical point

Schroeder

Ubaid-Kassis

Vojta

2011

J. Phys.: Condens. Matter

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We report magnetization measurements close to the ferromagnetic quantum phase transition of the d-metal alloy Ni(1 - x)V(x) at a vanadium concentration of x(c)≈11.4%. In the diluted regime (x > x(c)), the temperature (T) and magnetic field (H) dependences of the magnetization are characterized by nonuniversal power laws and display H/T scaling in a wide temperature and field range. The exponents vary strongly with x and follow the predictions of a quantum Griffiths phase. We also discuss the deviations and limits of the quantum Griffiths phase as well as the phase boundaries due to bulk and cluster physics.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Signatures of a quantum Griffiths phase in a d-metal alloy close to its ferromagnetic quantum critical point

Schroeder

Ubaid-Kassis

Vojta

2011

J. Phys.: Condens. Matter

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“…Ni1−xVx A small amount of vanadium (about 12%) suppresses T C to zero from T C ≈ 630 K in pure nickel (Bölling, 1968). Ni 1−x V x is attractive for studying quantum Griffiths effects for several reasons: i) it is simpler than Kondo-lattice ferromagnets and has Heisenberg symmetry, ii) the high T C of nickel allows the effects to be observable in a larger temperature range than in other systems, and iii) a vanadium impurity causes a strong reduction (about 90%) of the magnetic moment of the neighboring Ni atoms, which creates significant disorder.…”

Section: Fig 29mentioning

confidence: 99%

Metallic quantum ferromagnets

et al. 2016

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We give an overview of quantum phase transitions (QPTs) in metallic ferromagnets, discussing both experimental and theoretical aspects. These QPTs can be classified with respect to the presence and strength of quenched disorder: Clean systems generically show a discontinuous, or first-order, QPT from a ferromagnetic to a paramagnetic state as a function of some control parameter, as predicted by theory. Disordered systems are much more complicated, depending on the disorder strength and the distance from the QPT. In many disordered materials the QPT is continuous, or second order, and Griffiths-phase effects coexist with QPT singularities near the transition. In other systems the transition from the ferromagnetic state at low temperatures is to a different type of long-range order, such as an antiferromagnetic or a spin-density-wave state. In still other materials a transition to a state with glass-like spin dynamics is suspected. The review provides a comprehensive discussion of the current understanding of these various transitions, and of the relation between experiment and theory.

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“…It is known that T c of Ni 1−x V x is rapidly reduced with increasing V-concentration x [17]. As explained by Friedel [18], Ni 1−x V x resides on a side branch of the Slater-Pauling curve: a V impurity (with 5 fewer electrons than Ni) creates a localized charge and a spin reduction on the neighboring Ni-sites.…”

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confidence: 99%

Quantum Griffiths Phase in the Weak Itinerant Ferromagnetic AlloyNi1−xVx

2010

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We present magnetization (M) data of the d-metal alloy Ni(1-x)V(x) at vanadium concentrations close to x(c) approximately = 11.4% where the onset of long-range ferromagnetic (FM) order is suppressed to zero temperature. Above x(c), the temperature (T) and magnetic field (H) dependencies of the magnetization are best described by simple nonuniversal power laws. The exponents of M/H approximately T(-gamma) and M approximately H(alpha) are related by 1-gamma = alpha for wide temperature (10 < T < or = 300 K) and field (H < or = 5 T) ranges. gamma is strongly x dependent, decreasing from 1 at x approximately = x(c) to gamma < 0.1 for x = 15%. This behavior is not compatible with either classical or quantum critical behavior in a clean 3D FM. Instead it closely follows the predictions for a quantum Griffiths phase associated with a quantum phase transition in a disordered metal. Deviations at the lowest temperatures hint at a freezing of large clusters and the onset of a cluster glass phase.

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Ferro- und paramagnetisches Verhalten in den Mischkristallen des Nickels mit Vanadium, Rhodium und Platin im Temperaturbereich von 14° bis 1000°K

Cited by 15 publications

References 28 publications

Signatures of a quantum Griffiths phase in a d-metal alloy close to its ferromagnetic quantum critical point

Signatures of a quantum Griffiths phase in a d-metal alloy close to its ferromagnetic quantum critical point

Metallic quantum ferromagnets

Quantum Griffiths Phase in the Weak Itinerant Ferromagnetic AlloyNi1−xVx

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