1 / 11

Fermiology and metamagnetism in the tri-layered ruthenate Sr 4 Ru 3 O 10

Fermiology and metamagnetism in the tri-layered ruthenate Sr 4 Ru 3 O 10. Claudia Niculas University of Georgia July 29, 2005. Outline. Introduction Experimental setup The Process Data / Analysis Summary and conclusions.

august
Download Presentation

Fermiology and metamagnetism in the tri-layered ruthenate Sr 4 Ru 3 O 10

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fermiology and metamagnetism in the tri-layered ruthenate Sr4Ru3O10 Claudia Niculas University of Georgia July 29, 2005

  2. Outline • Introduction • Experimental setup • The Process • Data / Analysis • Summary and conclusions

  3. Introduction-Part I The Material- Sr4Ru3O10 • High quality (pure) crystal • Magnetic at low temperatures • Rapidly ferromagnetic (Tc = 105 K) • Displays quantum oscillations (Shubnikov de Haas effect) and possibly metamagnetism • Electronic contribution from heat capacity (DOI:10.1103/PhysRevB.68.174409)

  4. Goals Measure the resistance of Sr4Ru3O10 as a function of magnetic field in order to analyze (portion of) the geometry of its Fermi surface Investigate change in topography across the metamagnetic transition Motivation for FS investigation Defining property of a metal Electrical conductivity Heat transport Existence of new electronic phases Superconductivity Quantum critical behavior Introduction-Part IIPurpose and motivation C. Bergemann et. al. Phys. Rev. Lett., 84, 2662 (2000).

  5. Experimental setup Bitter plates of a resistive magnet The hybrid magnet in Tallahassee, a combination of a superconducting (21 T) and a resistive magnet (36 T); the most powerful continuous magnet in the world (45.17 T)

  6. The process • Sample (0.5-1.0 mm) • Sample holder • Probe • Cryostat • Hybrid • Cooling –three phases • Angle variation

  7. DataShubnikov de Haas effect across the metamagnetic transition Subtraction

  8. Fast Fourier analysis

  9. Effective mass extraction

  10. Summary and Conclusions • NHMFL hybrid magnet was used to measure resistance of Sr4Ru3O10 sample in a changing magnetic field. • Accurate measurements required high quality sample, very low temperatures, and high magnetic fields. • Quantum oscillations (Shubnikov de Haas effect) were observed, confirming high purity of crystal. • Preliminary results suggest a dramatic reconstruction of the Fermi surface at the metamagnetic transition. • Possibility of quantum critical behavior. • Further measurements (at lower temperatures) required in order to map out the entire FS, explore sample properties around the metamagnetic transition, study possible quantum phase transitions, etc.

  11. Acknowledgements • Luis Balicas • Ziqiang Mao • Kevin Storr • Zorana Nikodijevic • Gina LaFrazza • Pat Dixon • Sarah Mullins • Stacy Vanderlaan • REUs & RETs • NSF • NHMFL

More Related