Localized Magnetic Moment In A Dilute Alloy

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Theory of the Magnetic Properties of Dilute Palladium-Iron Alloys

Theory of magnetic properties of dilute palladium-iron alloys 443 coupling. Application of this, so called s-d interaction model, to the static magnetic properties of the Pd-Fe system has been made by Takahashi & Shimizu (I965). In the present paper we show that the model also provides a convenient framework

Origin of the volume collapse under pressure in elemental Dy

pressure resistivity experiments on the dilute magnetic alloy Y(Dy) to 114 GPa give evidence for the validity of the Kondo volume collapse model for elemental Dy. 1. Introduction The lanthanide metals have many interesting properties which are closely related to their strongly localized 4f electrons.

The contribution to the electronic specific heat due to

ties are magnetic and the non-magnetic behaviour of these alloys is due to the Kondo spin compensated bound state. The basic problem connected with the theoretical description of these alloys, therefore, is whether the condition for the appearance of a localized magnetic moment is fulfilled or not.

PHYSICAL PROPERTIES OF METALLIC MAGNETIC COMPOUNDS: 5f-BAND

Abstract. - We review the parameters responsible for the occurrence of localized magnetic moments in dilute or concentrated metallic actinide systems, and discuss their experimental evidence. The dilute U, Thl-, and (U,Thl-,)S Kondo systems, the protactinium compounds, UA12 and the rocksalt compounds will be more

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throughout the alloy is expected to be accompanied by the broadening of the line widths.(3) When the impurity atoms are nonmagnetic, they provide a rather large local magnetic disturbance resulting in non-negligible line broadening. The line broadening is expected to be much less if the impurity atoms have a large magnetic moment of their own.

43 Kondo effect - Binghamton University

At the very dilute magnetic concentration (ppm) there are the isolated impurity-conduction electron coupling leading to the Kondo effect. This localized interaction (if J<0) causes a weakening or fluctuation of the magnetic moment, and below the Kondo temperature, the magnetic moment disappears and the impurity appears non-magnetic.

ScN:Mn a dilute ferromagnetic semiconductor

Mn on a Sc site is found to induce a localized state in the middle of the band gap of ScN with t2g character. Its spin splitting leads to a net magnetic moment of 2-3 B per Mn. Calculations of unit cell for near neighbor Mn atoms reveal that the spins prefer ferromagnetic coupling. Using mean field approximation and assuming

Localization of Fe d-states in Ni-Fe-Cu alloys and

using X-ray magnetic circular dichroism (XMCD). The magnetic moments of Fe and Ni are found to respond very di erently to Cu alloying: Fe becomes a strong ferromagnet in Py, with the magnetic moment largely una ected by Cu alloying. In contrast, the Ni magnetic moment decreases continuously with increasing Cu concentration.

Short Communication Review on Available Theoretical Models

lute subsystem of localized magnetic spins and an even more dilute gas of free carriers [10]. 2.2 Zener Model Zener postulates the model of FM driven by the ex-change interaction amongst carriers and localized spins. When transition atoms dissolved in a metal or alloy that generally contains only completed inner

Temperature dependence of the resistivity due to localized

May 18, 2020 istivity due to LSF and that caused by a well defined localized magnetic moment. In 1964, Coles discovered a remarkable temperature dependence of the resistivity of dilute RhFe alloys which, after a very rapid rise (10-1p.Q cm/at % Fe for 3 K) linear in the temperature, tends around 10 K to flatten out into the shape of a knee.

Magnetic I mpurity In Narrow-Gap Semiconductors

2. Magnetic properties 253 One may first ask the question as to in what state the magnetic impurities are when they are dissolved in these crystals. The magnetic susceptibility measure­ ments~,7l have revealed that in the Snl xMnx Te alloy system the Mn ions order

Hyperfine interactions in dilute Se doped FexSb1−x bulk alloy

Dilute Magnetic Semiconducting (DMS) materials are conventional semiconductors, in which appropriate fraction of the original atoms is substituted by transition metals (TM), which are capable to add localized magnetic moment above room temperature (RT). These DMS represents challenging, promising and exciting areas of futuristic material science.

OPEN ACCESS materials - MDPI

an antiferromagnetic state with a low magnetic moment and a ferromagnetic state with a high magnetic moment. In this model, it is the excess entropy associated with the thermal excitations between the two magnetic states that is responsible for the unusual thermal expansion of these alloys. The existence of such stable, nearly degenerate stable

Anomalous Magnetism and Superconductivity in Lanthanide

of the dilute magnetic alloy La(2 at.% Ce) versus pressure compared to that of pure La.5 The very large superconducting pair breaking in the alloy leads to a sinkhole-like depression of Tc near 1 GPa. The appearance of Kondo e ect phenomena indicates that the magnetic state of Ce is approaching an instability. Besides suppressing superconduc-

Relation between the Anderson and Kondo Hamiltonians

A canonical transformation is used to relate the Anderson model of a localized magnetic moment in a dilute alloy to that of Kondo. In the limit of small s-dmixing, which is the most favorable case for the occurrence of a moment, the two models are shown to be equivalent. The Anderson model thus has low-temperature

JournalofPhysics:CondensedMatter J.Phys.:Condens.Matter 32

that supports a localized magnetic moment on each ion. The Ruderman Kittel Kasuya Yosida (RKKY) exchange inter-actions between these ions normally lead to magnetic order-ing at temperatures well above 1 K. A notable exception is Pr with its 4f2 con˘guration where magnetic ordering occurs at To = 50 mK [1 3] instead of the 15 K

MAGNETIC RESONANCE IN DILUTE MAGNETIC ALLOYS: HYPERFINE

extracted from magnetic resonance measurements even in the bottlenecked regime. This paper reports the observation of the hyper- fine splitting of a localized moment resonance in a metal [12]. We have observed the resonance spectrum of Ag : Er16' for erbium concentrations (nominal) of 28, 65, 86 and 1,500 ppm. A representative observation

Conduction electron scattering and the resistance of the

Magnetic scattering Many alloy systems of interest may contain one or more magnetic phases Disorder within itinerant or localized spin systems will cauze scattering of conduction electrons. The spin state of the conduction electrons σ can adopt only one of the two values, ±1/2(spin up and down ) and interacts with

Anomalous pressure dependence of magnetic ordering

localized magnetic moment (J = 6) to at least 70 GPa [8]. In this paper, we present the results of dc electrical resistivity measurements on Tb over the temperature range 3.8 295 K to pressures as high as 141 GPa, well above the pressure of 53 GPa where Tb suffers a 5% volume collapse at the phase transition from hexagonal hR24 to body-centered

Micro(point)contact spectroscopy of dilute magnetic (Kondo

region with localized magnetic moment (Fe and Cu) leads to the appearance of a deep minimum d. 2. V/dI (V) < 0 on the microcontact spectra at V ~ 1 mV, which corresponds to the maximum of dV/dI at V =0. A theoretical analysis of the problem of current flow in TABLE I. Characteristics of Alloys Studied

Local magnetic field near Mn atoms in Cu-Mn dilute alloys

local magnetic /spin density perturbation/ in the environment of impurity atoms. Alloul et al. [7] report such measurement on Al-Mn dilute alloys. For Cu-based alloys only the results of Lang et al. Qf] obtained on Cu-Co dilute alloys are known. This group determined the local magnetic field at the

University of Texas at Arlington Dissertation Template

The impurities containing unfilled d or f shells may have localized magnetic moments in nonmagnetic metals, semiconductors, and superconductors under certain conditions. These localized moments interact with each other through the spin polarization field of conduction electrons.

Recent Advances in Dilute Magnetic Semiconductor1

A DMS can be visualized as a collage of conventional non-magnetic semiconductor and small amount of magnetic transition-metal ion. These materials show the interaction between delocalized band electrons (conduction (s-type) and valence (p-type)) and localized (d or f-type) electrons of magnetic ions [l]. For its

Kondo-like effect in antiferromagnetic gamma -Fe- Mn-Ge

due to a Kondo.ti!e effect caused by localized magnetic moments on Fe atom sites which are induced or enhanwd by the solation of Ce in y-Fe-Mn alloys. 1. Introduction The resistivity minimum phenomenon occurring in a dilute alloy of a transition elements in

Magnetic Properties and Oxygen Defects of Dilute Metal Doped

impurity band as dilute magnetic mechanism.[7] Which dilute magnetic oxide semiconductor is fact or fiction is discussed.[8] It is necessary to reveal the chemical and magnetic states of doped metal ions in semiconductors and whether the doped metal ions exist as uniformly dispersed metal ions, clusters and/or precipitated compounds. O

Resistivity and magnetoresistance of dilute solutions of Mn

thorough discussion of the behavior of dilute magnetic alloys. One of the most popular elements which has been used as the metallic matrix, M, in the study of M-X alloys has been Cu. A number of experi­ ments (3) have established the existence of the Kondo effect for dilute solutions of several transition elements in Cu, and the resistivity and

Surface-emitting spin-polarized In0.4Ga0.6AsÕGaAs quantum-dot

decoherence.4 The spin-injector layer is usually a dilute mag-netic semiconductor ~DMS!. Collective polarization in a DMS provides a large magnetic moment. The dilute III V alloys ~Ga,Mn!As, which are ferromagnetic semiconductors, provide a localized magnetic moment and holes. An ex-change interaction between localized spins of the Mn atoms

Title Localized Spin Fluctuations in 4d and 5d Transition

from susceptibility measurements of dilute (-1%) solutions of Fe in various 4d ele-ments and alloys that in certain of these host metals the Fe impurities possess a localized magnetic moment, whereas in others they do not. This remarkable behavior drew Anderson's attention' to the local moment problem.

Magnetic behaviour of AuFe and NiMo alloys

Figure 2 shows the local magnetic moment on the Fe atom in the Au 1−xFe x alloyinthe same composition range. We should note two specific points: (i) Even in the composition range x≤ 0.1, where the global magnetic moment is exper-imentally found to be zero, locally Fe atoms in the alloy have finite moments at low temperatures.

Local magnetic ordering of Fe impurities in Pd2MnSn

of the alloy, due to local magnetic coupling of the localized moment of an Fe impurity with those of its neighbouring Mn atoms. 2. Experimental technique and results The M6ssbauer spectra of Fe sT embedded as dilute substitutional impurities in the

Mn-doped monolayer MoS2: An atomically thin dilute magnetic

The overall magnetic moment of the supercell is 1 μ B corresponding to the single excess d electron provided by the Mn atom. From the bond lengths listed in Fig. 1(b),itisclear that there is a loss of D 3h (trigonal prism) symmetry at the Mn dopant site.25 A significant portion of the spin density is localized on the Mn atom. The neighboring

Antiferromagnetism in dilute chromium alloys

localized moments do not exist above the Neel temperature. The observation of a nuclear magnetic resonance above the Neel temperature in chromium by Barnes and Graham (5) also confirms the absence of localized moments. Further support for this idea is also obtained from the absence of a large

Osaka University Knowledge Archive : OUKA

IN DILUTE ALLOYS Author(s) 松村, 政博 Magnetic Susceptibility Measurements (2). Results of The Nuclear 1vragnetie R.esonance (2-1). Antiferromagnetic State (2

Y1 -xUxPd3

and two-channel behavior in a dilute alloy and the first example of marginal Fermi liquid phenomenology in a fully three-dimensional system. 1. Introduction The intermetallic compound UPd3 is unique in that it is the only material where all properties are consistent with localized 5f electrons. In particular,

Finite temperature magnetism in dilute magnetic semiconductors

Application to dilute magnetic semiconductors Mechanism and TC calculations Impurity band in the gap →double exchange →short ranged interaction Localized moment →p-d exchange →long ranged interaction Low concentration, Low TC(Magnetic percolation problem) Inhomogeneous distribution of impurities Phase separation (spinodal decomposition)

Platinum Group Metals and Compounds

represent the measured magnetic data reasonably well, at least for the case where well-localized moments are developed on the solute atoms (11, 18). However, considerably more data has become available on other properties of dilute alloys, including data on resistivity and specific

New Approach to the Theory of Itinerant Electron Ferromagnets

interacting electrons moving in a Gaussian-weighted external magnetic field which acts only on the electronic spins. For a single magnetic impurity in a free electron metal, a single approximation allows one to go from Pauli paramagnetism to localized moment behavior in a smooth manner as the atomic exchange interaction is increased.

18, 24 PHYSICAL REVIEW LETTERS 12 JUNE 1967

the alloy. In their recent communication, Day­ bell and Steyert. lO presented evidence based on low-temperature resistivity and suscepti­ bility measurements for the formation of such a bound state consistent with some quenching of the localized moment associated with very dilute Fe in Cu. The results of Mossbauer ex­