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dc.contributor.authorQuilliam, Jeffreyen
dc.date.accessioned2007-05-08 14:05:25 (GMT)
dc.date.available2007-05-08 14:05:25 (GMT)
dc.date.issued2006en
dc.date.submitted2006en
dc.identifier.urihttp://hdl.handle.net/10012/2964
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.formatapplication/pdfen
dc.format.extent2493312 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherUniversity of Waterlooen
dc.rightsCopyright: 2006, Quilliam, Jeffrey. All rights reserved.en
dc.subjectPhysics & Astronomyen
dc.subjectMagnetismen
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
dc.pendingfalseen
uws-etd.degree.departmentPhysicsen
uws-etd.degreeMaster of Scienceen
uws.typeOfResourceTexten
uws.peerReviewStatusUnrevieweden
uws.scholarLevelGraduateen


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