2 edition of **Dynamics of impurity spin above the Kondo temperature** found in the catalog.

Dynamics of impurity spin above the Kondo temperature

A. Zawadowski

- 308 Want to read
- 37 Currently reading

Published
**1968**
by Hungarian Academy of Sciences, Central Research Institute for Physics in Budapest
.

Written in English

- Nuclear spin.

**Edition Notes**

Statement | [by] A. Zawadowski and P. Fazekas. |

Series | KFKI, 33/1968 |

Contributions | Fazekas, Patrik, joint author. |

Classifications | |
---|---|

LC Classifications | QC1 .M23 1968, no. 33 |

The Physical Object | |

Pagination | 4 p. |

ID Numbers | |

Open Library | OL4539526M |

LC Control Number | 77005856 |

We will give a more precise picture of this in a moment; note that the impurity spin must bind to quite a complicated superposition of the impurity electron states in order to explain the nonanalytic behavior of the Kondo temperature. We start with a set of simplifications of the problem introduced by :// Also a study on the crossover behavior of the Kondo temperature between the exponential and the power law type is presented. I. In the case of an impurity spin, S=1/2, the energy of a single electron coupled with the impurity is such that the 1 ferromagnetic › 百度文库 › 高校与高等教育.

coupling of the impurity to the bosonic bath competes with the Kondo effect and leads, for 0 s 1, to an unstable in-teracting critical point that describes a continuous quantum phase transition QPT between a Kondo-screened phase, in which the impurity moment is quenched by conduction elec-trons S z =0, and a localized phase where S z 0. Thus,~kevin//publications/Glossop_PRB_75_pdf. rity dynamics due to superconductivity,1 or have relied on the equations of motion approach which is formally only valid at temperatures above the Kondo temperature.2 In anal-ogy to the usual NCA, we expect our approach based on the NS-NCA to be quantitatively valid for temperatures well be-low TK. The Dyson equations pictured diagrammatically ~clerk/PDFfiles/

Kondo Anomaly of Impurity Spin Resonance Linewidth Z. Physik , 59 (). 5. W. Brenig, W. Götze, and P. Wölfle, Spin Relaxation and Transport in Local Moment Systems Phys. Rev. B2, (). 6. P. Wölfle Effect of Spin Diffusion on the Spin Resonance in Local Moment Systems Z. Physik , (). 7. W. Brenig, G. Döhler, and P 2 days ago The Kondo E ect and Conformal Field Theory. By dicup / / 7; Observation of the Multi-channel ‘charge’ Kondo Effect

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The dynamics of impurity spin contained by nonmagnetic host metal is investigated theoretically. The pseudofermion representation proposed byAbrikosov is applied to impurity spin.

The calculations are carried out keeping only the leading logarithmic terms in any order of the perturbation theory. This approximation is adequate only above the Kondo :// Dynamics of impurity spin above the Kondo temperature The correlation time τ i of the impurity electron spin in the Kondo system CuCo (T K ≅ K) has been determined over the temperature range 77 K ⪕ T ⪕ K by means of NMR relaxation of impurity neighbour copper nuclei.

τ i is temperature independent and has a value of × s. The impurity-induced part of NMR relaxation follows the modified Korringa relation T 1imp T (ΔK) 2 The correlation time τ i of the impurity electronic spin in the Kondo system Cu:Fe has been measured over the temperature range K⩽T⩽ K (T K = K) by means of NMR relaxation of impurity neighbour nuclei.

τ i being in the sub-picosecond region varies with temperatures as predicted by the model calculation of Götze and :// Spin Dynamics of a Kondo System in the Presence of Crystal Fields the Lorentz shape above the spin ordering temperature. In V F compounds spin correlations do not play a role, but the high Spin dynamics in the diluted ferromagnetic Kondo lattice model Avinash Singh,1,2,3,∗ Subrat K.

Das,3 Anand Sharma,1 and Wolfgang Nolting,1 1Institut fu¨r Physik, Humboldt-Universit¨at zu Berlin, Newton str. 15, D Berlin 2Max-Planck-Institut fu¨r Physik Komplexer Systeme, N¨othnitzer str. 38, D Dresden and 3Department of Physics, Indian Institute of Technology Kanpur - ∗ below the Kondo temperature, the magnetic moment disappears and the impurity appears non-magnetic.

Thus the Kondo effect prevents strong impurity-impurity interaction which are basic necessity of the spin glass. Up to a concentration of few thousand ppm ( at.

%), the RKKY (~suzuki/SolidStatePhysics/ the impurity spin, ~s b ~s b= 1 2 1 N X ~k~k0 X cy ~k ~˙ c ~k0 (4) is the spin of the conduction electrons at the impurity site and ~˙are the Pauli matrices.

The lattice has a ﬁnite size of Nsites which are sent to N!1in the thermodynamic limit. Over the period of the last 50 years we have learned that the Kondo problem is not restricted to spin relaxation and spin precession as a function of tem-perature, magnetic ﬁeld and coupling strength.

Both fer-romagnetic and antiferromagnetic couplings are consid-ered. In the Kondo regime, spin dynamics is governed by the Kondo time scale tK = 1/TK, where TK is the Kondo temperature of the system. In the ferromagnetic regime, electron undergoes spin-changing collisions with surrounding atoms.

This system realizes a new type of quantum impurity problems that compounds essential features of the Kondo model, the Bose polaron, and the central spin model. To capture the interplay of the Rydberg-electron spin dynamics FKLM. We also study ﬁnite-temperature spin dynamics within a locally self-consistent magnon renormalization scheme equivalent to a site-dependent Tyablikov decoupling, and present the ﬁrst site-dependent calculations for the temperature dependence of local impurity magnetization by explicitly incorporating the spatial feature of magnon :// Above the Kondo temperature, rapid spin-flip scattering produces a temperature-dependent correction to the resistivity of the form, B k lnT.

Until recently, both the Kondo resistivity and T k were thought to be determined solely by the host metal and the magnetic impurity. However, numerous presentations in this volume attest, there is now The Kondo temperature can be expressed as 8 T K = (πw Z Γ/4k B), where w = is the Wilson coefficient, Γ is the hybridization linewidth in the magnetic channel and Z is the quasiparticle We consider dynamics of a Rydberg impurity in a cloud of ultracold bosonic atoms in which the Rydberg electron can undergo spin-changing collisions with surrounding atoms.

This system realizes a new type of the quantum impurity problem that compounds essential features of the Kondo model, the Bose polaron, and the central spin :// to use the corrected Kondo temperature to perform the scaling analysis.

Actually, in the previous experiment [26] the fact that the width of the Kondo resonance peak becomes broader as the increasing temperature is reported, shows the distinc-tion between the conventional Kondo temperature and the cor - rected Kondo temperature we mentioned :// ture spin entropy, and since the characteristic width is the Kondo temperature, it follows that the the characteristic zero temperature speciﬁc heat coe cient must be of order the inverse Kondo temperature: = C V T (T!0) ˘Rln2 T K.

(See Fig. 3 b) The only scale in the physics is T K. For example, the resistivity created by arXiv:cond-mat/v1 [-el] 29 May Dynamics of a tunneling magnetic impurity: Kondo eﬀect induced incoherence L. Borda, 1G. Zara´nd,2 1Research Group of the Hungarian Academy of Sciences, Institute of Physics, TU Budapest, H Hungary, 2Lyman Physics laboratory, Harvard University, Cambridge MA (February 1, ) The Kondo model describes a single spin coupled to a Fermi gas.

It seems innocuous enough: one small step up in difficulty from a static impurity, perhaps. Not so. The Kondo problem has in fact played a huge role in many body physics over the years, both for the methods required to solve it, and because it keeps popping up in different Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in context.

Temperature Dependence of the Impurity Magnetic Moment for Mn in Cu above the Kondo Temperature Journal of Applied Phys ( The temperature dependent spin dynamics of vanadium impurities in the Kondo alloy AuV (theta/sub K/ approximately equal to K) have been studied by means of measurements of /sup 51/V transverse relaxation rates (T/sub 2//sup -1/) for the temperature range 1 to K and vanadium concentrations of and at.%.

We compare the experimental Kondo temperature with the theoretical predictions for the spin- 12 Anderson impurity model. Excellent agreement is found throughout the Kondo ://The Kondo effect1 is usually connected with the interaction between a localized spin moment and itinerant electrons.

This interaction leads to the formation of a narrow resonance at the Fermi singlet. As the temperature T is raised, the entanglement entropy converts to thermal entropy, given by the integral of the speciﬁc heat coefﬁcient, S(T) = Z T 0 dT0 C V(T0) T0: Since the total area under the curve, S(T!1) = Rln2 per mole, is the high-temperature spin entropy, and since the characteristic width is the Kondo temperature,