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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">Please join us today for the CMT Seminar presented by Piers Coleman from Rutgers University at 11:30am in the Smith Seminar Room (1080 PRB).
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Georgia","serif"">“Ising quasiparticles and Hastatic Order in URu2Si2”<o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Georgia","serif"">Abstract:</span></b><span style="font-size:12.0pt;font-family:"Georgia","serif""> The hidden order that develops below 17.5K in the heavy fermion compound URu2Si2 has eluded
identification for twenty five years. We show that the recent observation of Ising quasiparticles in URu2Si2 suggests a novel two-component order describing hybridization between electrons and the Ising 5f^{2} states of the uranium atoms. This ``hastatic
order'' (Latin: Spear) is distinct from conventional magnetism, because the state that is formed breaks both single and double time-reversal symmetry operations. In so doing, it<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">mixes states of different Kramers parity allowing the conduction electrons to pick up the Ising anisotropy of a spin-1 ion.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">We'll talk about bigger the implications of this kind of order, and its<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">predictions for URu2Si2.
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">* Work carried out in collaboration with Rebecca Flint, MIT and Premi Chandra, Rutgers. arXiv:1207.4828 Supported by NSF DMR 0907179.
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Georgia","serif"">Trisch<o:p></o:p></span></p>
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