Show simple item record

dc.contributor.authorQuilliam, Jeffreyen 14:05:25 (GMT) 14:05:25 (GMT)
dc.description.abstractThe system LiHo<sub><em>x</em></sub>Y<sub>1-<em>x</em></sub>F<sub>4</sub> is a nearly perfect example of a dilute, dipolar-coupled Ising magnet and, as such, it is an ideal testing ground for many theories in statistical mechanics. At low holmium concentration (<em>x</em> = 0. 045) an unusual spin liquid or "anti-glass" state was discovered in previous work [1]. This state does not exhibit a spin glass freezing transition as is expected for a long-range interaction. Instead, it shows dynamics which are consistent with a collection of low-frequency oscillators [2]. It was also seen to have sharp features in its specific heat [3]. <br /><br /> We present heat capacity measurements on three samples at and around the concentration of the spin liquid state in zero magnetic field and in a temperature range from around 50 mK to 1 K. In contrast to previous measurements, we find no sharp features in the specific heat. The specific heat is a broad feature which is qualitatively consistent with that of a spin glass. The residual entropy as a function of <em>x</em>, obtained through a numerical integral of the data, however, is consistent with numerical simulations which predict a disappearance of spin glass ordering below a critical concentration of dipoles [4]. <br /><br /> Also presented here, is ac susceptibility data on an <em>x</em> = 0. 45 sample which exhibits a paramagnetic to ferromagnetic transition and is found to be consistent with previous work.en
dc.format.extent2493312 bytes
dc.publisherUniversity of Waterlooen
dc.rightsCopyright: 2006, Quilliam, Jeffrey. All rights reserved.en
dc.subjectPhysics & Astronomyen
dc.subjectSpin Glassen
dc.subjectLow Temperature Physicsen
dc.subjectCondensed Matter Physicsen
dc.subjectDisordered Materialsen
dc.subjectSpecific Heaten
dc.titleSpecific Heat of the Dilute, Dipolar-Coupled, Ising Magnet LiHo<sub><em>x</em></sub>Y<sub>1-<em>x</em></sub>F<sub>4</sub>en
dc.typeMaster Thesisen
uws-etd.degreeMaster of Scienceen

Files in this item


This item appears in the following Collection(s)

Show simple item record


University of Waterloo Library
200 University Avenue West
Waterloo, Ontario, Canada N2L 3G1
519 888 4883

All items in UWSpace are protected by copyright, with all rights reserved.

DSpace software

Service outages