Local moments in the paramagnetic phase of dilute CrV alloys

Hill, Peggy; Ali, Naushad; Oliveira, A. J. A. de; Ortiz, W.A.; Camargo, P.C. de; Fawcett, E.

doi:10.1088/0953-8984/6/9/017

Cited by 20 publications

(17 citation statements)

References 29 publications

(5 reference statements)

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“…It turns out in fact that V strongly affects many other physical properties, including (Fawcett, 1992) inelastic neutron scattering, nuclear magnetic relaxation time, the nature of the Néel transition, electrical resistivity in the paramagnetic phase, and the magnetoelastic properties. We shall consider here only the appearance with V doping of a component of the susceptibility χ(T ) in the paramagnetic phase having a temperature dependence that obeys a Curie-Weiss law (Hill et al, 1994). CrMn alloys, on the other hand, have been found to exhibit remarkable spin-glass properties at low temperatures (Galkin et al, 1995(Galkin et al, , 1996b(Galkin et al, , 1997a.…”

Section: Impurity Statesmentioning

confidence: 99%

“…Temperature dependence of the magnetic susceptibility χ(T ) of pure Cr and two dilute CrV alloys. The line through the data points above the Néel temperature, T N = 311 K, for Cr is a quadratic fit to χ(T ) (from Hill et al, 1994).…”

Section: Impurity Statesmentioning

confidence: 99%

“…They have been made possible, like the discovery of spin-glass behaviour in CrMn alloys, by the advent of highly sensitive methods of measuring the magnetic susceptibility with low measuring fields, either by use of a SQUID magnetometer (Hill et al, 1994) or of an AC susceptometer (de Oliviera et al, 1996a). It is quite likely that other alloys of Cr with non-magnetic metals will be found, when re-examined more carefully by use of these methods, to exhibit Curie-Weiss paramagnetism.…”

Section: Impurity Statesmentioning

confidence: 99%

See 2 more Smart Citations

Spin-density-wave antiferromagnetism in chromium alloys

Alberts²,

et al. 1994

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The chromium system, comprising pure Cr and alloys with most transition metals and some nontransition metals, is the archetypical spin-density-wave (SDW) system. This paper supplements, with a brief summary and extension to include recent work, two previous comprehensive reviews on Cr (Fawcett, 1988) and Cr alloys . The magnetic phase diagrams are reviewed. Impurity states in CrFe and CrSi, when suitably doped with V or Mn, produce dramatic effects in the electrical resistivity, including a low-temperature resistance minimum due to impurity-resonance scattering. Curie-Weiss paramagnetism appears just above the Néel temperature in dilute CrV alloys. Recent work on inelastic neutron scattering in pure Cr is reviewed: the apparent absence of dispersion of the spin-wave modes at the wave vectors of the incommensurate SDW where the Bragg satellite peaks occur; the energy-dependent anisotropy of the excitations in the longitudinal-SDW phase; the commensurate magnetic scattering at the centre of the magnetic zone, which at higher energy and temperature dominates the inelastic scattering at the satellites; the Fincher-Burke excitations seen at low-energy in the transverse-SDW phase; and the silent satellites seen in single-Q Cr at off-axis incommensurate points as temperature increases towards the Néel transition. X-ray scattering with synchrotron radiation has illuminated the relation between the SDW in Cr and the incommensurate charge-density wave that accompanies it.

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Section: Impurity Statesmentioning

confidence: 99%

Section: Impurity Statesmentioning

confidence: 99%

Section: Impurity Statesmentioning

confidence: 99%

See 1 more Smart Citation

Spin-density-wave antiferromagnetism in chromium alloys

Alberts²,

et al. 1994

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“…When one introduces these impurities in Cr, the temperature dependence of the magnetic susceptibility shows a Curie-Weiss ͑CW͒ behavior below and above T N . However, for alloys with V, [4][5][6] Si, 7 Rh, 8 Mo and W, 9 this behavior is present only above T N . In particular for dilute CrV alloys, the magnetic susceptibility develops a CW component only above T CW , a temperature previously defined, 5 which is somewhat higher than T N .…”

Section: Introductionmentioning

confidence: 97%

Magnetic field dependence of the Curie–Weiss paramagnetism in CrV alloys

Oliveira

Ortiz

Lima

et al. 1997

Journal of Applied Physics

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The determination of the magnetic properties of antiferromagnetic Cr alloys requires careful consideration of the influence of the applied magnetic field. In this work we show that alloys of Cr-x at. % V present a Curie-Weiss paramagnetism above the Néel temperature, which is suppressed by a characteristic field H L. Samples with xϭ0.1, 0.2, and 0.4 were investigated through measurements of the magnetic susceptibility as a function of temperature, for different values of the magnetic field. A magnetic phase diagram showing the characteristic line H L vs x at. % V is proposed.

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“…It has been suggested that the rapid drop in amplitude scale on the first introduction of vanadium is associated with the decrease in the nuclear spin-lattice relaxation rate and the electrical resistivity, and perhaps also with the recently discovered formation of local moments, in dilute Cr͑V͒ alloys. 19 Remember that the tricritical point also lies between pure chromium and 0.2 at. % V, 12 and so there is scope for subtle effects to occur in this region.…”

Section: Discussionmentioning

confidence: 98%

Concentration dependence of critical scattering from Cr(V) alloys above the Néel temperature

1997

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We have measured triple-axis neutron scattering data for a single crystal of Crϩ0.5 at. % V, in the paramagnetic state above the Néel transition. The data are well fit by a critical magnetic scattering model involving a form of critical susceptibility proposed by Sato and Maki, and the results compared to those for single crystals of chromium and Crϩ0.2 at. % V. All of the results are generally consistent with a critical exponent Ϸ0.7. Magnetic stiffness evolves smoothly over the range of alloy concentration studied, but the amplitude scale of the critical fluctuations is more complicated, dropping by more than a factor of 2 between pure chromium and 0.2 at. % V, the region of the magnetic tricritical point and onset of local moments, but then changing little between 0.2 and 0.5 at.

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Local moments in the paramagnetic phase of dilute CrV alloys

Cited by 20 publications

References 29 publications

Spin-density-wave antiferromagnetism in chromium alloys

Spin-density-wave antiferromagnetism in chromium alloys

Magnetic field dependence of the Curie–Weiss paramagnetism in CrV alloys

Concentration dependence of critical scattering from Cr(V) alloys above the Néel temperature

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