Spin fluctuations in metallic glasses<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Zr</mml:mi></mml:mrow><mml:mrow><mml:mn>75</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:ma

Hamed, Fathalla; Razavi, F. S.; Bose, Sangita; Startseva, T.

doi:10.1103/physrevb.52.9674

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…The normal state resistivity ρ n is calculated from resistance measurements performed at room temperature on long ribbons (> 30 cm) such as to minimize geometrydependent effects. ρ n of the order 1.68 µΩm is obtained for all alloys; these values are close to values reported for similar alloys 3,6,7,9 . Since ρ n is related to the GSRO, the constant ρ n throughout this composition range brings further confirmation of the constant GSRO.…”

Section: A Superconducting Propertiessupporting

confidence: 89%

“…Although these first attempts at making amorphous alloys were plagued by the inconvenient instability of the amorphous phase at room temperature, they have served to expose the differences between superconductivity in amorphous materials and in their crystalline counterpart. Nowadays, several techniques based on the rapid cooling of the melt are used to fabricate stable amorphous alloys and the past 25 years have seen the publication of many studies about superconductivity in such metallic glasses, especially those composed of transition metal alloys 3,4,5,6,7,8,9 . These studies have, among other things, discussed the importance of including effects due to spin fluctuations in the predictions of T c , especially in alloys containing Ni, Co, or Fe.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, several superconducting properties, for instance the shape and width of the B c2 transition, or magnetization hysteresis loops are direct consequences of the homogeneity of the material and its flux trapping capacities. Binary and pseudo-binary compounds composed of the early transition (ET) metal Zr and late transition (LT) metal Cu, Ni, Co and Fe in the form LT x ET 1−x and (LT a x LT b 1−x ) y ET 1−y have shown excellent glass-forming abilities over a wide compositional range 3,7,9,10,11 . In this article, we study such a pseudobinary compound, namely Fe x Ni 1−x Zr 2 superconducting glasses with 0 ≤ x ≤ 0.6, based on electric transport and local magnetization measurements.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Superconductivity and short-range order in metallic glassesFexNi1−xZr2

2009

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In amorphous superconductors, superconducting and vortex pinning properties are strongly linked to the absence of long range order. Consequently, superconductivity and vortex phases can be studied to probe the underlying microstructure and order of the material. This is done here from resistance and local magnetization measurements in the superconducting state of FexNi1−xZr2 metallic glasses with 0 ≤ x ≤ 0.6. Firstly, we present typical superconducting properties such as the critical temperature and fields and their dependence on Fe content in these alloys. Then, the observations of peculiar clockwise hysteresis loops, wide double-step transitions and large magnetization fluctuations in glasses containing a large amount of Fe are analyzed to reveal a change in short range order with Fe content.

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Section: A Superconducting Propertiessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Superconductivity and short-range order in metallic glassesFexNi1−xZr2

2009

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“…Our results for bulk metals cannot be applied to such cases. Finally, these considerations should hold for amorphous (glassy) superconducting alloys as well [65][66][67].…”

Section: Pressure Dependence Of T C and Alloying Effectsmentioning

confidence: 99%

Electron–phonon coupling and spin fluctuations in 3d and 4d transition metals: implications for superconductivity and its pressure dependence

Bose¹

2008

J. Phys.: Condens. Matter

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We have calculated the electron-phonon coupling for the complete 4d series and the nonmagnetic 3d transition metals using the linear response method and the linear muffin-tin orbitals' basis. A comparison of the linear response results and those obtained via the rigid muffin-tin approximation is provided. Based on the calculated values of the electron-phonon coupling constants, band density of states and the measured values of the electronic specific heat constants, we estimate the spin-fluctuation effects, i.e. the electron-spin-fluctuation (electron-paramagnon) coupling constants in these systems. For the sake of comparison, several other metals, Cu, Zn, Ag, Cd, Al and Pb, are also studied. Alternative estimates of the electron-paramagnon coupling constants are obtained from the values of the Stoner parameters and the band densities of states at the Fermi level. Implications of these results on the superconductivity and its pressure dependence as well as the alloying effects of superconductivity in these systems are discussed. It is pointed out that spin fluctuations play an important role in the validity of the Matthias rule that in metallic systems the optimum conditions for (electron-phonon) superconductivity occur for 5 and 7 valence electrons/atom.

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“…While for group 4 metallic glasses over the range 30–300 K, Mizutani proposed the following empirical equation ρ(T)/ρ(300 K) = A + B exp(−T/Δ), where A, B and Δ are fitting parameters [4]. At temperatures below 30 K, superconductivity and quantum interference effects arise [5,6]. Nano-crystallization of metallic glasses is an active field that promises materials with excellent physical properties [7,8,9].…”

Section: Introductionmentioning

confidence: 99%

Positive and Negative Temperature Dependence in the Resistivity of Crystallized Zr-Fe-Ni Metallic Glasses

Hamed

2010

Materials

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Ni0.25Fe0.75Zr3 metallic glassy ribbons were annealed in evacuated quartz ampoules beyond the crystallization temperatures (Tx ~655 K) over the range 773 to 1,173 K for varying periods of time. The resistivity of samples annealed over the temperature range 923 to 1,073 K for periods less than four hours increased as a function of decreasing temperature, while it decreased for samples annealed for more than four hours or at temperatures below 923 K or above 1,073 K for any period of time. All the annealed samples were found to contain only Ni, Fe and Zr from energy dispersive X-ray (EDX) analyses.

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Spin fluctuations in metallic glassesZr75(Nix

Cited by 12 publications

References 7 publications

Superconductivity and short-range order in metallic glassesFexNi1−xZr2

Superconductivity and short-range order in metallic glassesFexNi1−xZr2

Electron–phonon coupling and spin fluctuations in 3d and 4d transition metals: implications for superconductivity and its pressure dependence

Positive and Negative Temperature Dependence in the Resistivity of Crystallized Zr-Fe-Ni Metallic Glasses

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