scholarly journals Phase diagram of a spin ladder with cyclic four-spin exchange

2003 ◽  
Vol 67 (10) ◽  
Author(s):  
A. Läuchli ◽  
G. Schmid ◽  
M. Troyer
Keyword(s):  
Phase Diagram ◽  
Spin Exchange ◽  
Spin Ladder

scholarly journals Phase Diagram of an Asymmetric Spin Ladder

2001 ◽  
Vol 87 (8) ◽  
Author(s):  
Shu Chen ◽  
H. Büttner ◽  
J. Voit
Keyword(s):  
Phase Diagram ◽  
Spin Ladder

scholarly journals Magnetic phase diagram of a frustrated spin ladder

2018 ◽  
Vol 97 (14) ◽  
Author(s):  
Takanori Sugimoto ◽  
Michiyasu Mori ◽  
Takami Tohyama ◽  
Sadamichi Maekawa
Keyword(s):  
Phase Diagram ◽  
Magnetic Phase ◽  
Magnetic Phase Diagram ◽  
Spin Ladder ◽  
Frustrated Spin

EXACT SOLUTIONS IN A SPATIALLY ANISOTROPIC QUANTUM SPIN LADDER MODEL HAVING TWO- AND FOUR-SPIN EXCHANGE INTERACTIONS

2009 ◽  
Vol 23 (08) ◽  
pp. 1981-2019 ◽  
Author(s):  
J. H. BARRY ◽  
J. D. COHEN ◽  
M. W. MEISEL
Keyword(s):  
Spin Exchange ◽  
Inelastic Neutron Scattering ◽  
Exchange Interactions ◽  
Inelastic Neutron ◽  
Elementary Excitation ◽  
Quantum Spin ◽  
Quantum Model ◽  
Spin Ladder ◽  
Zero Field ◽  
Ladder Model

We consider a two-leg S=1/2 quantum spin ladder model with two-spin (intra-rung) and four-spin (inter-rung) Heisenberg exchange interactions and a uniform magnetic field. Exact mappings are derived connecting the partition function and correlations in the three-parameter quantum model to those known in a two-parameter Ising chain. The quantum phase diagram of the ladder magnet is determined. Static correlations provide pertinent correlation lengths and underlie spatial fluctuation behaviors at arbitrary temperatures, including quantum fluctuations at absolute zero. Dynamic correlations in zero field are used to obtain an exact solution for the inelastic neutron scattering function Sxx(q, ω) at all temperatures, explicitly yielding the elementary excitation spectrum.

scholarly journals Magnetization plateau in the spin ladder with a four-spin exchange

1999 ◽  
Vol 60 (1) ◽  
pp. 48-51 ◽  
Author(s):  
Tôru Sakai ◽  
Yasumasa Hasegawa
Keyword(s):  
Spin Exchange ◽  
Spin Ladder ◽  
Magnetization Plateau

Phase diagram of three-leg spin ladder

1996 ◽  
Vol 29 (13) ◽  
pp. 3559-3579 ◽  
Author(s):  
Keisuke Totsuka ◽  
Masuo Suzuki
Keyword(s):  
Phase Diagram ◽  
Spin Ladder

SUPERCONDUCTIVITY AND FERROMAGNETISM IN HYBRID SYSTEMS

2003 ◽  
Vol 17 (04n06) ◽  
pp. 661-667
Author(s):  
MARIO CUOCO ◽  
CANIO NOCE
Keyword(s):  
Phase Diagram ◽  
Charge Transfer ◽  
Single Particle ◽  
Normal State ◽  
Exchange Coupling ◽  
Spin Exchange ◽  
Critical Value ◽  
Particle Charge ◽  
Spin Singlet

Interplay of superconductivity (SC) and ferromagnetism (FM) is studied in a system constituted of alternated planes with FM metallicity and spin singlet SC, respectively. The phase diagram of the SC, FM, and normal state is obtained as the amplitude of the single particle charge transfer between the planes is varied. One important finding is the appearance of a region with coexistence of SC and FM at small values of the interlayer hopping amplitude, though the FM exchange coupling is below the critical value indicated by the Stoner criterium. We consider the role of the direct spin exchange coupling with respect to the degree of hybridization between FM and SC fermions and how those mechanisms may destroy the coexisting phase. Relation to exotic superconductors recently discovered, as the ruthenate-cuprate compound of the class RuSr 2 GdCu 2 O 8, is also presented.

EFFECT OF CORRELATED-HOPPING INTERACTION ON A ONE-DIMENSIONAL EXTENDED HUBBARD MODEL WITH SPIN-EXCHANGE INTERACTION

2012 ◽  
Vol 26 (07) ◽  
pp. 1150044 ◽  
Author(s):  
HANQIN DING ◽  
JUN ZHANG
Keyword(s):  
Phase Diagram ◽  
Nearest Neighbor ◽  
Spin Exchange ◽  
One Dimensional ◽  
Body Interaction ◽  
Hartree Fock ◽  
Interacting Electrons ◽  
1D Model ◽  
Isotropic Exchange ◽  
Three Body

By using the field-theoretical techniques combining bosonization with renormalization group, we study a one-dimensional (1D) model of interacting electrons with on-site repulsion (U > 0), nearest-neighbor (nn) exchange (J) and correlated-hopping (t2, t3) interactions at weak coupling. In the case of a half-filled band, the two-body interaction t2 does not influence phase diagram of the model, while the presence of three-body interaction t3 makes the physics of the system highly non-trivial. By a Hartree–Fock decoupling, the effects of t3 bring about hopping of pairs, V-like (nn Coulomb interaction) and isotropic exchange terms in the reduced model Hamiltonian. Interestingly, a negative t3 provides a possibility for the occurrence of the triplet superconductivity in 1D system with purely repulsive interactions (U, J > 0). The ground state phase diagram including the insulating and superconducting phases is discussed analytically.

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