Nanostructured antiferromagnetic spin glass in doped Ge near the insulator-metal transition

2008 ◽  
Vol 5 (3) ◽  
pp. 824-828 ◽  
Author(s):  
A. G. Zabrodskii ◽  
A. I. Veinger ◽  
T. V. Tisnek ◽  
S. I. Goloshchapov
Keyword(s):  
Spin Glass ◽  
Insulator Metal Transition ◽  
Antiferromagnetic Spin

Antiferromagnetic spin glass ordering in the compensatedn-Ge near the insulator–metal transition

2004 ◽  
Vol 1 (1) ◽  
pp. 71-74 ◽  
Author(s):  
A. I. Veinger ◽  
A. G. Zabrodskii ◽  
T. V. Tisnek ◽  
S. I. Goloshchapov
Keyword(s):  
Spin Glass ◽  
Insulator Metal Transition ◽  
Antiferromagnetic Spin

Antiferromagnetic spin glass in doped Ge near insulator-metal transition

2009 ◽  
Vol 35 (3) ◽  
pp. 439-448 ◽  
Author(s):  
A. G. Zabrodskii ◽  
Anatoly I. Veinger ◽  
T. V. Tisnek ◽  
S. I. Goloshchapov
Keyword(s):  
Spin Glass ◽  
Insulator Metal Transition ◽  
Antiferromagnetic Spin

Magnetic States of Nanoparticles with RKKY Interaction

2013 ◽  
Vol 774-776 ◽  
pp. 523-527 ◽  
Author(s):  
Valery I. Belokon ◽  
Konstantin V. Nefedev ◽  
Vitalii Y. Kapitan ◽  
Olga I. Dyachenko
Keyword(s):  
Spin Glass ◽  
Effective Magnetic Moment ◽  
Magnetic State ◽  
Field Method ◽  
Spherical Nanoparticles ◽  
Rkky Interaction ◽  
Interaction Field ◽  
Magnetic States ◽  
Antiferromagnetic Spin ◽  
Nonmagnetic Matrix

Conditions of phase transitions in systems of identical ferromagnetic spherical nanoparticles randomly distributed in metal nonmagnetic matrix and superlattices of small number of nanoparticles with the Ruderman-Kittel-Kasuya-Yosida interaction are researched. In the framework of the Ising model the behavior of superspins is well described with the random interaction field method. The alteration of the effective magnetic moment due to the change in volume affects the choice of the magnetic state of the system: ferromagnetic spin glass or antiferromagnetic spin glass. The ground state of superlattice depends on the distance between particles.

Antiferromagnetic spin glass-like behavior in sintered multiferroic Aurivillius Bim+1Ti3Fem−3O3m+3 compounds

2013 ◽  
Vol 342 ◽  
pp. 27-34 ◽  
Author(s):  
E. Jartych ◽  
T. Pikula ◽  
M. Mazurek ◽  
A. Lisinska-Czekaj ◽  
D. Czekaj ◽  
...  
Keyword(s):  
Spin Glass ◽  
Antiferromagnetic Spin

Ferro-, quasiferro- and antiferromagnetic spin-glass orders in random anisotropy crystalline DyxY1−xAl2 compounds

1992 ◽  
Vol 104-107 ◽  
pp. 243-245 ◽  
Author(s):  
A. Del Moral ◽  
J. Schweizer ◽  
J.I. Arnaudas ◽  
M.B. Salamon ◽  
C. Ritter ◽  
...  
Keyword(s):  
Spin Glass ◽  
Random Anisotropy ◽  
Antiferromagnetic Spin

scholarly journals DOPED MAGNETIC MOMENTS IN A DISORDERED ELECTRON SYSTEM: INSULATOR–METAL TRANSITION, SPIN GLASS AND "COLOSSAL MAGNETORESISTANCE"

2001 ◽  
Vol 15 (19n20) ◽  
pp. 2683-2705 ◽  
Author(s):  
SANJEEV KUMAR ◽  
PINAKI MAJUMDAR
Keyword(s):  
Spin Glass ◽  
Colossal Magnetoresistance ◽  
Magnetic Moments ◽  
Magnetic Semiconductor ◽  
Structural Disorder ◽  
Electron System ◽  
Electron Interaction ◽  
Strong Electron ◽  
Insulator Metal Transition ◽  
Magnetic Disorder

Recent experiments on the amorphous magnetic semiconductor Gd x Si 1-x, have revealed an insulator–metal transition (IMT), as a function of doping and magnetic field, a spin glass state at low temperature, and colossal magnetoresistance close to the IMT. There are also signatures of strong electron–electron interaction close to the IMT. Motivated by these results we examine the role of doped magnetic moments in a strongly disordered electron system. In this paper we study a model of electrons coupled to structural disorder and (classical) magnetic moments, through an essentially exact combination of spin Monte Carlo and fermion exact diagonalisation. Our preliminary results, ignoring electron–electron interactions, highlights the interplay of structural and magnetic "disorder" which is primarily responsible for the observed features in magnetism and transport.

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