Critical properties of a random transverse crystal field Ising model with bond dilution
Tóm tắt
Within effective field theory (EFT), the critical properties of a random transverse crystal field Ising model with bond dilution are studied on a square lattice. Under both weak and strong bond dilution conditions, we consider three cases (α = 0,±0.5) of a transverse crystal field ratio, obtaining global phase diagrams in T−D
x space for changes in the random transverse crystal field concentration. The phase diagrams obtained for a weak bond dilution are very similar in shape to those of pure bond but with decreases in corresponding ordered phases and critical values. However, the phase diagrams for a strong bond dilution exhibit varieties, including a change in reentrant phenomenon, the occurrence of transverse crystal field degeneration, and the opposite direction crossover of temperature peak value.
Tài liệu tham khảo
M. Blume, Phys. Rev. 141, 517 (1966)
H.W. Capel, Physica 32, 966 (1966)
K. Hui, N. Berker, Phys. Rev. Lett. 62, 2507(1989)
I. Puha, H.T. Diep, J. Magn. Magn. Mater. 224, 301 (2001)
S.L. Yan, L.L. Deng, Commun. Theor. Phys. 39, 481 (2003)
H.X. Zhu, S.L. Yan, Commun. Theor. Phys. 42, 789 (2004)
C.J. Silva, A.A. Caparica, J.A. Plascak, Phys. Rev. E 73, 036712 (2006)
L. Bahmad, A. Benyoussef, A. El-Kenz, Phys. Rev. B 76, 094412 (2007)
S.M. Pittman, G.G. Batrouni, R.T. Scalettar, Phys. Rev. B 78, 214208 (2008)
A. Malakis, A.N. Berker, I.A. Hadjiagapiou, N.G. Fytas, Phys. Rev. E 79, 011125 (2009)
G. Suran, K. Ounadjela, F. Machizaud, Phys. Rev. Lett. 57, 3109 (1986)
H.J. Witt, C.M.M. Witmer, F.W.A. Dirne, IEEE T. Magn. 23, 2123 (1987)
N.C. Eddeqaqi, M. Saber, A. El-Atri, M. Kerouad, Physica A272, 144 (1999)
W. Jiang, G.Z. Wei, A. Du, J. Magn. Magn. Mater. 250, 49(2002)
K. Htoutou, A. Ainane, M. Saber, J. Magn. Magn. Mater. 269, 245 (2004)
C. Ekiz, J. Strecka, M. Jascur, Cent. Eur. J. Phys. 7, 509 (2009)
L. Xu, S.L. Yan, Acta Phys. Sin.-Ch. Ed. 56, 1691 (2007) (in Chinese)
J. Oitmaa, W.H. Zheng, Physica A 328, 185 (2003)