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2. 3. Griffiths droplets. 1. 4. RKKY. RKKY Interactions and Dissipation in Metallic Griffiths Phases Vladimir Dobrosavljevic, Florida State University, DMR-0234215.

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Griffiths

droplets

1

4

RKKY

RKKY Interactions and Dissipation in Metallic Griffiths PhasesVladimir Dobrosavljevic, Florida State University, DMR-0234215

  • Disorder and rare events completely change the behavior of magnetic systems close to a quantum critical point, leading to quantum Griffiths phases.
  • In metallic magnetsadditional long-ranged RKKY interactions couple the rare regions causing non-Ohmicdissipation.
  • In electronic Griffiths phases: (disordered heavy fermions far from magnetic ordering) this leads to disorder-induced fractionalization and spin liquid behavior (D. Tanaskovic, V. Dobrosavljevic, and E. Miranda, Phys. Rev. Lett. 2005, in press).
  • In magnetic Griffiths phases:RKKY interactions lead to dissipative freezing of magnetic droplets and the formation of cluster-glassphases (V. Dobrosavljevic and E. Miranda, Phys. Rev. Lett. 94, 187203 (2005)).
  • Both mechanism can lead to disorder-driven non-Fermi liquid behavior. Recent review: E. Miranda and V. Dobrosavljevic, Reports on Progress in Physics 68, 1-72 (2005) .

RKKY interactions mediating non-Ohmic

dissipation in magnetic Griffiths phases (top).

Phase diagram of the induced cluster-glass

phase (bottom).

slide2
RKKY Interactions and Dissipation in Metallic Griffiths PhasesVladimir Dobrosavljevic, Florida State University, DMR-0234215
  • Outreach activities:
  • The PI presented a “Saturday Morning Physics” lecture “Physics on the Web” to High School students.
  • The PI participated in the Florida State University Physics Department Open House, with a display: “Physics of Paper Airplanes for Kids”.
  • The PI participated in the NHMFL Annual Open House activities with a display “Physics of Behind Magnetism”).
  • Educational:
  • One undergraduate student, two graduate students and a postdoc contributed to these projects. These students received training in many-body theory, including computer modeling and analytical calculations.

Synergistic Activities: the PI, together with E. Dagotto, S. Sachdev, and J. Zaanen organized an international workshop at the Lorentz Center (Leiden, The Netherlands) that drew roughly 60 international participants.

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