Low Energy Properties of the Random Spin-1/2 Ferromagnetic-Antiferromagnetic Heisenberg Chain

Abstract

The low energy properties of the spin-1/2 random Heisenberg chain with ferromagnetic and antiferromagnetic interactions are studied by means of the density matrix renormalization group (DMRG) and real space renormalization group (RSRG) method for finite chains. The results of the two methods are consistent with each other. The deviation of the gap distribution from that of the random singlet phase and the formation of the large-spin state is observed even for relatively small systems. For a small fraction of the ferromagnetic bond, the effect of the crossover to the random singlet phase on the low temperature susceptibility and specific heat is discussed. The crossover concentration of the ferromagnetic bond is estimated from the numerical data.

11 pages, revtex, figures upon request

Cited by in corpus (15)

• The density-matrix renormalization group
• New Trends in Density Matrix Renormalization
• Disorder-Driven Non-Fermi Liquid Behavior of Correlated Electrons
• One-Dimensional Magnetism
• Enhancement of Antiferromagnetic Correlations Induced by Nonmagnetic Impurities: Origin and Predictions for NMR Experiments
• Numerical renormalization-group study of spin correlations in one-dimensional random spin chains
• Density-Matrix Renormalization-Group Analysis of Quantum Critical Points: I. Quantum Spin Chains
• Thermodynamics of Random Ferromagnetic Antiferromagnetic Spin-1/2 Chains
• Low-Temperature Scaling Regime of Random Ferromagnetic-Antiferromagnetic Spin Chains
• Generation of Large Moments in a Spin-1 Chain with Random Antiferromagnetic Couplings
• Modified spin-wave study of random antiferromagnetic-ferromagnetic spin chains
• Effects of randomness on the antiferromagnetic spin-1 chain
• Effect of Spin-1 Impurities in Dimerized Heisenberg Chains
• Infinite-size density matrix renormalization group with parallel Hida's algorithm
• Spin Waves in Random Spin Chains