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<p class="MsoNormal"><span style="color:#1F497D">**CORRECTION**<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The date for the talk is Thursday, June 27<sup>th</sup>, not June 26<sup>th</sup>. My apologies for any confusion.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Trisch<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Longbrake, Patricia
<br>
<b>Sent:</b> Tuesday, June 25, 2013 12:54 PM<br>
<b>To:</b> Physics-All<br>
<b>Subject:</b> CME Seminar - Sarah Dunsiger, Munich Technical University - Thursday, June 26th at 11:30am - Smith Seminar Room<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please join us on Thursday for the CME Seminar presented by Sarah Dunsiger from the Munich Technical University at 11:30am in the Smith Seminar Room.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>Spin Excitations on the Pyrochlore Lattice<o:p></o:p></b></p>
<p class="MsoNormal"><b><o:p> </o:p></b></p>
<p class="MsoNormal">Geometric magnetic frustration is a ubiquitous phenomenon within condensed matter<o:p></o:p></p>
<p class="MsoNormal">physics. “Spin ices” combine the rich phenomenology associated with such competing<o:p></o:p></p>
<p class="MsoNormal">interactions with Ising models. Theory predicts the associated low temperature<o:p></o:p></p>
<p class="MsoNormal">magnetic excitations consist of deconfined magnetic charges, or monopoles [1,2].<o:p></o:p></p>
<p class="MsoNormal">Startlingly, in the archetypal spin ice compounds A2Ti2O7 (A=Dy,Ho), as found in many<o:p></o:p></p>
<p class="MsoNormal">highly frustrated magnetic materials, we report spin fluctuations which become<o:p></o:p></p>
<p class="MsoNormal">temperature independent at low temperatures [3], behaviour which dominates over any<o:p></o:p></p>
<p class="MsoNormal">signature of thermally nucleated monopole excitations.<o:p></o:p></p>
<p class="MsoNormal">A major unresolved question concerns the fate of the spin ice state, when the strength<o:p></o:p></p>
<p class="MsoNormal">of the local Ising anisotropy is reduced, which may boost the relative importance of<o:p></o:p></p>
<p class="MsoNormal">quantum fluctuations [4]. I set our recent investigations using the complementary<o:p></o:p></p>
<p class="MsoNormal">techniques of ěSR and dc-magnetisation in context, exploring the phase diagram of<o:p></o:p></p>
<p class="MsoNormal">these unusual magnetic systems.<o:p></o:p></p>
<p class="MsoNormal">[1] I. Ryzhkin, Journal of Experimental and Theoretical Physics
<b>101</b>, 481 (2005).<o:p></o:p></p>
<p class="MsoNormal">[2] C. Castelnovo, R. Moessner, and S. L. Sondhi, Nature <b>
451</b>, 42 (2008).<o:p></o:p></p>
<p class="MsoNormal">[3] S. R. Dunsiger <i>et al</i>, Physical Review<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you,<o:p></o:p></p>
<p class="MsoNormal">Trisch<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img width="224" height="45" id="Picture_x0020_1" src="cid:image001.png@01CE71A5.7C661350" alt="The Ohio State University"><br>
<b><span style="color:#C00000">Trisch Longbrake</span></b><o:p></o:p></p>
<p class="MsoNormal">Administrative Associate I<br>
<span style="color:#C00000">Department of Physics</span> Condensed Matter<br>
2196 Physics Research Building, 191 W. Woodruff Ave., Columbus, OH 43210<br>
614-292-2778 Office / 614-292-7557 Fax<br>
<a href="mailto:longbrake.6@osu.edu">longbrake.6@osu.edu</a> <a href="http://osu.edu/">
osu.edu</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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