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Anomalous Curie response of impurities in quantum-critical spin-1/2 Heisenberg antiferromagnets | | K. H. Hoglund
; A. W. Sandvik
; | | Date: |
19 Jan 2007 | | Subject: | Strongly Correlated Electrons | | Abstract: | We consider a magnetic impurity in two different S=1/2 Heisenberg bilayer antiferromagnets at their respective critical inter-layer couplings separating N’eel and disordered ground states. We calculate the impurity susceptibility using a quantum Monte Carlo method. With intra-layer couplings in only one of the layers (Kondo lattice), we observe an anomalous Curie constant C*, as predicted on the basis of field-theoretical work [S. Sachdev et al., Science 286, 2479 (1999)]. However, the value C*=0.262 +/- 0.002 falls outside the conjectured range (S^2)/3 < C* < S(S+1)/3 for an S=1/2 impurity. Our low-temperature results for the symmetric bilayer are consistent with a universal C*. | | Source: | arXiv, cond-mat/0701472 | | Services: | Forum | Review | PDF | Favorites | |
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