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Condensed Matter and Statistical Physics Journal Club

Talk Details

Title s=1/2 Heisenberg Antiferromagnet with doped nonmagnetic impurities
Speaker Argha Banerjee
Date Mon, 07 Jun 2010
Time 14:30
Venue A 304


I shall discuss the following four papers.

1. Yu-Chang Chen and A. H. Castro Neto, Phys. Rev. B 61, R3772 (2000) [Effective Non-linear sigma model description: predicts that with increasing doping/dilution, long range order vanishes at a doping concentration below percolation threshold p_c]

2. K. Kato, S. Todo, K. Harada, N. Kawashima, S. Miyashita, and H. Takayama, et al., Phys. Rev. Lett. 84, 4204 (2000) [Numerical simulation for s=1/2, 1, 3/2, and 2: showing AF order vanishes at p_c. At p_c system is critical with AF order decaying with a spin dependent exponent.]

3. Anders W. Sandvik, Phys. Rev. B 66, 024418 (2002) [Simulations for s=1/2: showing AF order persists till p_c and infinite cluster at p_c is long range ordered. ]

4. O. P. Vajk, P. K. Mang, M. Greven, P. M. Gehring, J. W. Lynn, Science Vol. 295, pp. 1691 - 1695 [Experiments on Zn+Mg doped La2CuO4: AF order dies at p_c, doping dependece of orderparameter is consistent with paper 2 above.]