Seminars & Lectures
| * TITLE | Nexus between Quantum Critical Point and Phase Formation In U(Ru,Rh)2Si2: A Recent Progress | ||||||
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| * DATE / TIME | 2005-09-03, 03:30 P.M. | ||||||
| * PLACE | APCTP Seoul Branch Office(과총회관 신관 11층 3호) | ||||||
| * ABSTRACT | |||||||
| Nexus between Quantum Critical Point and Phase Formation in U(Ru,Rh)2Si2: A Recent Progress Kee Hoon Kim Systematic evolution of the magnetic field-versus-temperature phase diagram and quantum criticality in U(Ru1-xRhx)2Si2 (x=0, 2, 2.5, 3, and 4 %) are studied by measuring magnetization, heat capacity, resistivity and Hall effects in magnetic fields of up to 45 T. We find that complex multiphases are formed in URu2Si2 in close proximity to both a metamagnetic quantum critical point (QCP) at BQCP=~37 T and a critical field for the hidden order collapse, ~ 35 T. For x = 4 %, while the hidden order is completely destroyed at zero field, a single field-induced phase II remains stabilized between 28 and 38 T around BQCP=~34 T, exhibiting 1/3 of a saturated magnetic moment. A correlation between the field-dependence of this phase and that of the QCP, combined with an abrupt increase in the Hall coefficient and suppression of the T2 coefficient of the resistivity within it, implicates that a gap opening at the Fermi surface via phase formation is an effective way of quenching the field-induced quantum fluctuations and avoiding the QCP. |
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