# Ferrimagnetic Structure of Magnetoelectric

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VOLUME 16, NUMBER 6 P H Y S I C A L R E V I E W L E T T E R S 7 FEBRUARY 1966

E R R A T A

ENTROPY TRANSPORT BETWEEN TWO SUPER-CONDUCTORS BY ELECTRON TUNNELING. Kazumi Maki and Allan Griffin [Phys. Rev. Let-ters 15, 921 (1965)].

To avoid any misunderstanding, it should be noted that if we did not approximate co2 +f20 by co2 in Eq. (5), then {Qj)f would not vanish for fi-nite Q0. Thus, if we keep terms of relative or-der (Ti/ejr), we find that there is a very small entropy current associated with the tunneling of condensed pairs across a finite temperature dif-ference. We might remark in this connection that in our calculation we have taken the entropy current to be the energy current minus the mat-ter current times the chemical potential. Accord-ing to Luttinger1 and others, this identification is exact in a superconductor, although it is only correct to order (Ti/ej?)2 in a normal metal. While (Qj)t is very small, it would seem that the magnitude obtained using Eq. (5) [with co2- o>2 +20, except in the denominator a;1-a;2] is mean-ingful.

We take this opportunity to correct some typo-graphical e r ro rs . One should have (a) an extra factor of (-1) on the right-hand side of Eqs. (3) and (3'), (b) a plus sign in front of cos(2r20^ +$) in Eq. (4), (c) tanh(o)1/2T1) instead of tanh(o;2/ 2TX) in Eq. (5), and (d) 6T (7\ +T2)/2 in the seventh line following Eq. (7).

XJ. M. Luttinger, Phys. Rev. _136, A1481 (1964).

FERRIMAGNETIC STRUCTURE OF MAGNETO-ELECTRIC Ga2.-*Fe^03. R. B. Frankel, N. A. Blum, S. Foner, A. J. Freeman, and M. Schieber [Phys. Rev. Letters L5, 958 (1965)].

Page 958: Column 2, line 8, should read " four cation sites, three octahedral and one tetra-hedral, ." We thank Dr. S. C. Abrahams for pointing out this inadvertent error .

DENSITY OF STATES AND THE LOW-TEMPER-ATURE SPECIFIC HEAT IN DILUTE MAGNETIC ALLOYS. Michael W. Klein [Phys. Rev. Letters JL6, 127 (1966)].

The expression for A in the fifth and sixth lines after Eq. (4) should read

mm^t where &F is the Fermi wave vector and d is the lattice constant. The factor (l/2k-pd)3 has been used in the calculation but inadvertently left out of the expression for A. The coefficient of the logarithmic term is correctly given in the paper to be about unity, a becomes aln(700c/T&T).

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