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Investigation Of Ground State Of Spins In Ising Model For A Specific Value Of Interaction Strength J(I,J)=J And Establishment Of Numerical Relationship Between Hamiltonian And Magnetic Moments Of Spins

Md Hasanuzzaman
2012 IOSR Journal of Applied Physics  
Different nature of interaction strength produces a variety of ground states, such as for ferromagnetic type interaction ground state is with all spins either up or down, on the other hand for anti ferromagnetic  ...  spins ground state consists of anti parallel spins.  ...  At absolute zero (T=0), the ground state of a ferromagnetic system ( <0) is the one with all spins being at either up (+1) or down (-1) state.  ... 
doi:10.9790/4861-0152832 fatcat:4xmm5zg4jzbw3i7gchjwlfjllu

Dipole-exchange spin excitations in a thin ferromagnetic nanoshell

Yuri Gorobets, Volodymyr Kulish
2013 Open Physics  
AbstractIn this paper spin excitations in spherical ferromagnetic nanoshells are investigated.  ...  For a nanoshell that is thin compared to its size, the dispersion relation for nonzero spin excitation modes and the only possible frequency for zero-mode spin excitations are found.  ...  anisotropy axis of the system.  ... 
doi:10.2478/s11534-013-0172-x fatcat:qtutptnjr5fkxddv25bcux4ijy

Itinerant ferromagnetism of a dipolar Fermi gas with Raman-induced spin-orbit coupling [article]

Xue-Jing Feng and Xing-Dong Zhao and Wu-Ming Liu
2021 arXiv   pre-print
We elucidate the itinerant ferromagnetism of a dipolar Fermi gas with a Raman-induced spin-orbit coupling by investigating the exotic phase diagrams at zero and finite temperature.  ...  It is revealed that the dipolar interaction along with spin-orbit coupling can corroborate the formation of ferromagnetism and the Raman coupling adversely eliminates the tendency to this ferromagnetism  ...  For a many-particle system, the expectation of F is zero even in a partially-ferromagnetic state and has a non-zero value only in a symmetric normal state.  ... 
arXiv:2112.05898v2 fatcat:5cazjr23pjdgdiersgpenddygy

Random-fieldp-spin-glass model on regular random graphs

Yoshiki Matsuda, Hidetoshi Nishimori, Lenka Zdeborová, Florent Krzakala
2011 Journal of Physics A: Mathematical and Theoretical  
We also discuss the location of the phase boundary between the paramagnetic and spin glass phases that does not depend on the change of the ferromagnetic bias.  ...  One of our most interesting findings is that a thermodynamic spin glass phase is present in the three-body purely ferromagnetic model in random fields, unlike for the canonical two-body interaction random-field  ...  YM is grateful for the financial support provided through the Japan Society for the Promotion of Science (JSPS) Research Fellowship for Young Scientists Program.  ... 
doi:10.1088/1751-8113/44/18/185002 fatcat:uzasxch4wjeolk5cfhiv6kh3qm

Magnetic excitations and transport properties in frustrated ferromagnetic chain

Hiroaki Onishi
2019 Journal of Magnetism and Magnetic Materials  
To clarify the transport property mediated by bound magnons in a spin nematic state, we investigate the spin Drude weight of a spin-1/2 J_1-J_2 Heisenberg chain with ferromagnetic J_1 and antiferromagnetic  ...  At zero magnetic field, numerical results with up to 24 sites suggest that the spin Drude weight would be zero in the thermodynamic limit, indicating diffusive spin transport.  ...  Part of computations were carried out on the supercomputers at the Japan Atomic Energy Agency and the Institute for Solid State Physics, the University of Tokyo.  ... 
doi:10.1016/j.jmmm.2019.02.006 fatcat:c4lff6h77fg2ppaf7qzgkwqhli

Magnon-mediated superconductivity in itinerant ferromagnets

Naoum Karchev
2003 Journal of Physics: Condensed Matter  
ofa spin-1 triplet with zero spin projection.  ...  As a result, the onset of superconductivity leads to the appearance of two Fermi surfaces in each of the spin up and spin down momentum distribution functions.  ...  M is zero temperature dimensionless magnetization of the system per lattice site.  ... 
doi:10.1088/0953-8984/15/24/105 fatcat:rvif7znxivhhhd773aubtojgm4

The spin glass to ferromagnetic order transition in AuFe alloys

A. Hamzić, I.A. Campbell
1981 Journal de Physique Lettres  
Abstract. 2014 From resistivity and magnetoresistance data on AuFe we conclude that above the concentration where ferromagnetic order appears, in the low temperature state ferromagnetic and spin glass  ...  2014 A partir de mesures de résistivité et de magnétorésistance sur des alliages AuFe, nous trouvons qu'audela de la concentration où l'ordre ferromagnétique se manifeste, les ordres verre de spin et ferromagnétique  ...  and for c &#x3E; Ccru it has been suggested that the alloys are ferromagnets from Tc down to a second ordering temperature below which the systems are « spin glasses » [2] .  ... 
doi:10.1051/jphyslet:019810042013030900 fatcat:nd4hvu5awzafvnzf5uedrowhfi

Magnon Exchange Mechanism of Superconductivity: ZrZn_2, URhGe [article]

N. I. Karchev
2002 arXiv   pre-print
parameter is a spin anti-parallel component of a spin-1 triplet with zero spin projection.  ...  It is shown that in the presence of an external magnetic field the system undergoes a first order quantum phase transition.  ...  parameter is a spin antiparallel component of a spin-1 triplet with zero spin projection.  ... 
arXiv:cond-mat/0207078v1 fatcat:ju6bjgot4bbxbm6f3ttxd3w2sq

Quenched-vacancy induced spin-glass order

Gül Gülpınar, A. Nihat Berker
2009 Physical Review E  
The ferromagnetic phase of an Ising model in d=3, with any amount of quenched antiferromagnetic bond randomness, is shown to undergo a transition to a spin-glass phase under sufficient quenched bond dilution  ...  Conversely, in the ferromagnetic-spinglass-antiferromagnetic phase diagram, the spin-glass phase expands under quenched dilution at the expense of the ferromagnetic and antiferromagnetic phases.  ...  Figure 3 shows the zero-temperature limit of the global phase diagram of the currently studied system.  ... 
doi:10.1103/physreve.79.021110 pmid:19391709 fatcat:b6cvijjsszgx5hu342znf76d5u

Spiral phase and phase separation of the double-exchange model in the large-Slimit

Lan Yin
2003 Physical Review B (Condensed Matter)  
The phase diagram of the double exchange model is studied in the large-S limit at zero temperature in two and three dimensions.  ...  When the Hund coupling is large, the spiral phase disappears completely and the system separates into ferromagnetic regions and antiferromagnetic regions.  ...  At a high level of doping, the system goes into a ferromagnetic phase.  ... 
doi:10.1103/physrevb.68.104433 fatcat:xkawhjsy5rcnhmhacpc4sqjm3y

Spin Textures, Screening, and Excitations in Dirty Quantum Hall Ferromagnets

S. Rapsch, J. T. Chalker, D. K. K. Lee
2002 Physical Review Letters  
Screening of an impurity potential requires distortions of the spin configuration, and in the absence of Zeeman coupling there is a disorder-driven, zero-temperature phase transition from a ferromagnet  ...  We study quantum Hall ferromagnets in the presence of a random electrostatic impurity potential.  ...  Screening of an impurity potential requires distortions of the spin configuration, and in the absence of Zeeman coupling there is a disorder-driven, zero-temperature phase transition from a ferromagnet  ... 
doi:10.1103/physrevlett.88.036801 pmid:11801076 fatcat:xc5rmgpe7za2jcoupcl5d74iaq

Magnon exchange mechanism of ferromagnetic superconductivity

Naoum Karchev
2003 Physical Review B (Condensed Matter)  
to the ferromagnetic phase.The order parameter is a spin anti-parallel component of a spin-1 triplet with zero spin projection.  ...  It is shown that in the presence of an external magnetic field the system undergoes a first order quantum phase transition.  ...  Third, the order parameter is a spin antiparallel component of a spin triplet with zero spin projection.  ... 
doi:10.1103/physrevb.67.054416 fatcat:dsstvy3ebnhdrk5ss7xi23e5ye

The ferromagnetic to spin glass transition

A. Hamzić, I.A. Campbell
1981 Journal de Physique Lettres  
In PtFe the ferromagnetic to spin glass transition is second order. J.  ...  spin glass order sets in.  ...  If we consider each spin submitted to a ferromagnetic ordering interaction 2~, and a fraction q of the spins submitted to a random disaligning interaction Ed;~, then EF ~ kT~ and F~is ~ pHs where H,, is  ... 
doi:10.1051/jphyslet:0198100420101700 fatcat:lig6yrwwffbsrfnbahc3alh5aq

Blocking and Persistence in the Zero-Temperature Dynamics of Homogeneous and Disordered Ising Models

C. M. Newman, D. L. Stein
1999 Physical Review Letters  
A "persistence" exponent theta has been extensively used to describe the nonequilibrium dynamics of spin systems following a deep quench: for zero-temperature homogeneous Ising models on the d-dimensional  ...  cubic lattice, the fraction p(t) of spins not flipped by time t decays to zero like t^[-theta(d)] for low d; for high d, p(t) may decay to p(infinity)>0, because of "blocking" (but perhaps still like  ...  In modelling the nonequilibrium dynamics of spin systems following a deep quench, the following question naturally arises [1, 2, 3, 4, 5, 6, 7, 8] : given a spin system at zero temperature with random  ... 
doi:10.1103/physrevlett.82.3944 fatcat:v2mlcbw6gbd7djywkfn2ynl5ke

Detecting the Lee-Yang zeros of a high-spin system by the evolution of probe spin

A. R. Kuzmak, V. M. Tkachuk
2019 Europhysics letters  
Lett. 114, 010601 (2015)] the experimental observation of the Lee-Yang zeros of an Ising-type spin-1/2 bath, by measuring the coherence of a probe spin, was reported.  ...  Also we propose the implementation of these models on real physical systems.  ...  This work was supported in part by Project FF-30F (No. 0116U001539) from the Ministry of Education and Science of Ukraine and by the State Fund for Fundamental Research under the project F76.  ... 
doi:10.1209/0295-5075/125/10004 fatcat:7dftvevmkjh4zpmnivczqxvzjm
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