Current Topics in Physics: In Honor of Sir Roger J. Elliot by K. K. Kaski R. A. Barrio

By K. K. Kaski R. A. Barrio

This integral ebook is a compilation of invited talks added on the symposium, “Current subject matters in Physics” held in Mexico urban in June 2003, to have fun the seventy fifth birthday of Professor Sir Roger Elliott. The contributions were ready through examine affiliates, former scholars, post-doctoral fellows and co-workers of Professor Elliott, a lot of them best scientists — as Sir Roger himself — in very important study institutes all over the world. The ebook offers a truly well timed and accomplished assessment of assorted key components of contemporary condensed subject and statistical physics. 19 unique contributions are integrated, grouped in 3 major components: disease and dynamical structures, buildings and glasses, electric and magnetic homes.

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The mixing prescription (40) proves effective, as general scaling theory predicts, but in place of the original equation of state (10) one discovers [66] the modified equation ˜ − Dm)/ ˜ 2 )γ , c(h ˜ m ˜ ≈ (B 2 t + m (42) ˜ → 0. Evidently h ˜ has been subjected to the subtraction when t, m, ˜ and h of a term Dm, ˜ a totally unexpected result! One finds that D ∼ m†2 so that this “anomalous” term does vanish in a symmetric situation, in particular, if m1,c = m2,c = 0. But if D does not vanish at the critical point of interest, what is implied?

E. E. , Phys. Rev. B 43 (1991) 11177. Sarbach, S. , J. Appl. Phys. 49 (1978) 1350–1352. E. , Phys. Rev. Lett. 41 (1978) 1127–1130. Sarbach, S. , Phys. Rev. B 18 (1978) 2350–2363; Phys. Rev. B 20 (1979) 2797. E. , Phys. Rev. Lett. 28 (1972) 1516. , in Critical Phenomena: Proc. Enrico Fermi Int. Sch. Physics, Course No. 51, ed. S. (Academic Press, New York, 1971), pp. 1–99. N. , Ann. Phys. (NY) 77 (1973) 1–78. K. , Phys. Rev. B 33 (1986), 6415– 6422. N. , Phys. Rev. A 8 (1973) 1111– 1124. M. , J.

If we suppose m1 and m2 remain coplanar, the mean-field energy then takes the form Eeff = −h1 m0 cos θ1 − h2 m0 cos θ2 − j cos(θ1 − θ2 ). (44) To learn from this expression consider, first, the situation in zero field, ¯ = 1 (h1 + h2 ) = 0. , h 2 suppose relatively small, one immediately discovers that m1 and m2 swing 1 over to a mean direction perpendicular to the z-axis so that θ1 θ2 2 π, † ¯ while one finds that (θ1 −θ2 ) is of order h m0 /j. , 12 (m1 + m2 )z , increases linearly from −m0 to +m0 just as implied by the equation of ¯ plot corresponds to state (42).

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