Antiferromagnetism in Chromium Alloys. II. Transport Properties

Trego, A.L.; Mackintosh, A. R.

doi:10.1103/physrev.166.495

Cited by 131 publications

(26 citation statements)

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“…Allan Mackintosh and his co-workers Trego and Mackintosh, 1968) performed the first systematic study of the temperature dependence of the electrical resistivity ρ(T ) and the thermopower S(T ) of SDW alloys of Cr with V, Mn, Mo, W, and Re (and also neutron diffraction in the same alloys, Koehler et al, 1966). As well as finding qualitative agreement between the variation of the Néel temperature with electron concentration and an early version of the canonical model for the Cr system, they observed effects associated with the electron-hole condensation responsible for the formation of the SDW in Cr (Overhauser, 1962).…”

Section: Impurity Statesmentioning

confidence: 99%

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%

Spin-density-wave antiferromagnetism in chromium alloys

Alberts²,

et al. 1994

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“…We collect in Fig. 4 the variation of T N with x for a broad range of Cr-V alloys measured via electrical transport [6,14,15], neutron diffraction [16], nuclear magnetic resonance [17], and thermal expansion [18], as well as the suppression of spin-density-wave order with pressure for pure Cr [19], Cr 0.988 V 0.012 [20], Cr 0.972 V 0.028 [20] and Cr 0.968 V 0.032 (our data). All the data can be collapsed onto a universal curve using an effective V concentration x ef f that assumes the simplest linear conversion between chemical doping and applied pressure: P c = 31.042 · (3.430 − x).…”

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confidence: 99%

High Resolution Study of Magnetic Ordering at Absolute Zero

et al. 2004

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High fidelity pressure measurements in the zero temperature limit provide a unique opportunity to study the behavior of strongly interacting, itinerant electrons with coupled spin and charge degrees of freedom. Approaching the exactitude that has become the hallmark of experiments on classical critical phenomena, we characterize the quantum critical behavior of the model, elemental antiferromagnet chromium, lightly doped with vanadium. We resolve the sharp doubling of the Hall coefficient at the quantum critical point and trace the dominating effects of quantum fluctuations up to surprisingly high temperatures.PACS numbers: 75.40. Cx, 75.30.Fv, 71.27.+a, 42.50.Lc Phase transitions at the absolute zero of temperature are a result of Heisenberg's uncertainty principle rather than of a thermal exploration of states. Their ubiquity in materials of large technological interest, including transition metal oxides and sulfides, metal hydrides, superconducting cuprates, and colossal magnetoresistance manganites, combined with the intellectual challenge presented by many strongly interacting quantum degrees of freedom, places quantum phase transitions at the core of modern condensed matter physics. Quantum fluctuations inextricably intertwine the static and dynamical response of the material changing state, introducing new critical exponents, new scaling laws, and new relationships between the spin and charge degrees of freedom [1,2,3].Varying the quantum fluctuations required for zerotemperature phase transitions is more difficult than changing temperature, with the result that the understanding of quantum phase transitions is far less detailed than that of their classical analogues. Typically, fluctuations are varied by scanning the composition of an alloy, such as the doped cuprates that host hightemperature superconductivity. The result is that a new sample, each with unique disorder, must be fabricated for every zero-point fluctuation rate sampled. Tuning the transition with an external magnetic field, a quantity that is easily and precisely regulated, is a cleaner technique and provides correspondingly greater detail for both insulators [4] and metals [5]. However, magnetic fields also break time-reversal symmetry, which is particularly significant for quantum phase transitions because the dynamics responsible for zero-point fluctuations are altered profoundly. It is important, therefore, to examine a quantum phase transition for a simple material with high precision without applying a symmetry-breaking field. In response to this challenge, we have performed a high-resolution hydrostatic pressure study of a model quantum phase transition: elemental chromium diluted with its neighbor vanadium, small amounts of which can smoothly suppress Cr's spin-density-wave transition to T = 0. The Cr-V single crystals permit tuning with high fidelity and we are able to characterize precisely the signatures of vanishing magnetic order in a system sufficiently simple to promise theoretical tractability.Cr is the archetypical met...

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“…Such anomalies in transport properties have been measured in layered dichalcogenides where CDW have been directly observed by eIectronic diffraction [3]. In Cr at the NCel temperature the resistivity anomaly has been attributed to spin density waves (SDW) [4]. In this paper we present the results of two experiments which indicate that gaps are induced by CDW in NbSe,.…”

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confidence: 70%