scholarly journals Spin current Kondo effect in frustrated Kondo systems

2021 ◽  
Vol 65 (2) ◽  
Author(s):  
Jiangfan Wang ◽  
Yi-Feng Yang
Keyword(s):  
Kondo Effect ◽  
Spin Current ◽  
Kondo Systems

scholarly journals Three-body correlations in nonlinear response of correlated quantum liquid

2020 ◽  
Author(s):  
Tokuro Hata ◽  
Yoshimichi Teratani ◽  
Tomonori Arakawa ◽  
Sanghyun Lee ◽  
Meydi Ferrier ◽  
...  
Keyword(s):  
Kondo Effect ◽  
Unitary Limit ◽  
Quantum Liquid ◽  
Perfect Agreement ◽  
Fluctuation Dissipation ◽  
Kondo Systems ◽  
Ring Exchange ◽  
Many Body Systems ◽  
Three Body ◽  
Non Equilibrium

Abstract Understanding the properties of correlated quantum liquids is a fundamental issue of condensed matter physics. Even in such a correlated case, fascinatingly, we can tell that the equilibrium fluctuations of the system govern its linear response to an external field, relying on the fluctuation dissipation relations based on the two-body correlations. Going beyond, up to the three-body correlations, is of importance for van der Waals force [1], the three-body force in nuclei [2], the Efimov state [3, 4], the ring exchange interaction in solid 3He [5, 6], and frustrated spin systems [7]. In our work, we have used a quantum dot in the Kondo regime, which is a controllable realization of such a correlated quantum liquid [8–11]. Thanks to the quality of our sample, where the Kondo effect in the unitary limit was achieved, we could quantitatively measure the three-body correlations and their role in the non-equilibrium regime, in perfect agreement with recent results of the Fermi liquid theory [12– 15]. In particular, we have demonstrated its importance when time-reversal symmetry is broken, solving a long-standing puzzle of the Kondo systems under the magnetic field [13]. The demonstrated method to relate three-body correlation and non-equilibrium transport opens up a way for further investigation of the dynamics of quantum many-body systems.

Competition between Kondo effect and magnetic interaction in Kondo systems

1997 ◽  
Vol 230-232 ◽  
pp. 523-528 ◽  
Author(s):  
L.C. Andreani ◽  
E. Pavarini ◽  
E. Liviotti ◽  
P. Santini ◽  
G. Amoretti
Keyword(s):  
Kondo Effect ◽  
Magnetic Interaction ◽  
Kondo Systems

scholarly journals Direct evidence for suppression of the Kondo effect due to pure spin current

2016 ◽  
Vol 94 (14) ◽  
Author(s):  
K. Hamaya ◽  
T. Kurokawa ◽  
S. Oki ◽  
S. Yamada ◽  
T. Kanashima ◽  
...  
Keyword(s):  
Kondo Effect ◽  
Direct Evidence ◽  
Spin Current ◽  
Pure Spin

THEORY OF THE MAGNETIC FORM FACTOR IN REDUCED-MOMENT KONDO SYSTEMS

1996 ◽  
Vol 10 (10) ◽  
pp. 1167-1189 ◽  
Author(s):  
EVA PAVARINI ◽  
LUCIO CLAUDIO ANDREANI ◽  
GIUSEPPE AMORETTI
Keyword(s):  
Form Factor ◽  
Conduction Electron ◽  
Kondo Effect ◽  
Spin Fluctuation ◽  
Magnetic Form Factor ◽  
Variational Calculation ◽  
Electron Polarization ◽  
Kondo Systems ◽  
Electron Contribution ◽  
The One

The magnetic form factor in Kondo systems, as measured by polarized neutron elastic scattering, is uniformly reduced (with respect to the atomic form factor in the crystal field) due to the Kondo effect, and moreover it shows deviations at small scattering vector due to a spin polarization of conduction electrons: the sign of the deviations in Ce compounds is positive, which is opposite to what is observed in normal rare earths of the first half of the series, and expected from the s-f exchange Hamiltonian. In the present work the above two anomalies are interpreted within a theory for the magnetic form factor in Kondo systems. The uniform reduction of the form factor follows from a variational calculation for the one-impurity Anderson model in an effective magnetic field: Kondo reduction of the localized moment is distinguished here from the presence of a screening cloud, which cannot be observed by neutron scattering. The conduction electron polarization is first studied for the Coqblin-Schrieffer Hamiltonian, which we find to lead again to negative deviations of the form factor. Within the Anderson impurity model, the conduction electron contribution to the form factor is found to be the sum of two terms: a negative RKKY-like polarization, and a positive superexchange term, which is nonzero even for a filled (or empty) band. Dominance of the superexchange polarization could explain the observed sign of the deviations in Ce compounds. A variational basis which describes both Kondo reduction and conduction electron polarization effects is studied: the two effects are clearly separated, since they appear in different orders of the calculations. The conduction electron polarization is shown to be reduced due to the Kondo effect by the same spin-fluctuation factor which reduces the localized moment.

Spin-current Kondo effect: Kondo effect in the presence of spin accumulation

2021 ◽  
Vol 104 (12) ◽  
Author(s):  
Damian Tomaszewski ◽  
Piotr Busz ◽  
Jan Martinek
Keyword(s):  
Kondo Effect ◽  
Spin Current ◽  
Spin Accumulation

KONDO EFFECT AND LOCALIZED SPIN FLUCTUATIONS IN THE Zn-TRANSITION METAL SYSTEM

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-221-C1-223
Author(s):  
P. J. FORD ◽  
C. RIZZUTO ◽  
E. SALAMONI ◽  
P. ZANI
Keyword(s):  
Transition Metal ◽  
Kondo Effect ◽  
Spin Fluctuations ◽  
Metal System ◽  
Transition Metal System

MÖSSBAUER RELAXATION MEASUREMENTS ON Yb IN LaBel3 : INFLUENCE OF KONDO EFFECT AND SUPERCONDUCTIVITY

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-729-C8-730 ◽  
Author(s):  
P. Bonville ◽  
P. Imbert ◽  
G. Jéhanno ◽  
F. Gonzalez-Jimenez
Keyword(s):  
Kondo Effect ◽  
Relaxation Measurements
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