Department of Physics Papers

Document Type

Journal Article

Date of this Version

5-1960

Publication Source

Journal of Applied Physics

Volume

31

Issue

5

Start Page

49S

Last Page

50S

DOI

10.1063/1.1984600

Abstract

Heat capacity measurements of the iron garnets of Y, Gd, Er, Ho, and Yb between 1.4° and 20°K are presented. Below 5°K, the specific heat of YIG can be represented by the sum of a lattice term proportional to T3 and the spin-wave contribution 2.15 × 10−3T3/2 joules/mole-deg. This last term agrees satisfactorily with that calculated from a spin-wave analysis, in which the exchange interaction coefficients were those derived from Pauthenet's magnetization data. The results of the magnetic specific heat of the rare earth ions could be interpreted in terms of a Weiss molecular field acting on these ions. For Gd3+ and Yb3+, this field was found to be, respectively, about 3.0 × 105 and 1.5 × 105 oe below 20°K, in satisfactory agreement with that derived from Pauthenet's data.

Copyright/Permission Statement

Reprinted with permission from the Journal of Applied Physics. Copyright 1960, American Institute of Physics.

Comments

At the time of publication, author A. Brooks Harris was affiliated with Harvard University and Duke University. Currently, he is a faculty member in the Physics Department at the University of Pennsylvania.

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Date Posted: 12 August 2015

This document has been peer reviewed.