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Pulsed Field Facility (PFF)

Pulsed Field Facility (PFF). Chuck Mielke. User Support Staff. Fedor Balakirev (Electrical Transport) Jon Betts (Resonant Ultrasound) Scott Crooker (Optics) Neil Harrison (Magnetization) Marcelo Jaime (Heat Capacity) Ross McDonald (GHz/RF and Torque Magnetometry)

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Pulsed Field Facility (PFF)

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  1. Pulsed Field Facility (PFF) Chuck Mielke

  2. User Support Staff • Fedor Balakirev (Electrical Transport) • Jon Betts (Resonant Ultrasound) • Scott Crooker (Optics) • Neil Harrison (Magnetization) • Marcelo Jaime (Heat Capacity) • Ross McDonald (GHz/RF and Torque Magnetometry) • Albert Migliori (Resonant Ultrasound) • Dwight Rickel (Pulse Echo Ultrasound) • John Singleton (Magnetization) • Chuck Swenson (Pulsed Magnet Design) • Vivien Zapf (Thermodynamics and Dielectrics) • Chuck Mielke (Single Turn Coil)

  3. Pulsed Magnets on the floor (11/2008) • Cell 1 (50 T Mid Pulse, 15 mm, 300 msec) • Cell 2 (50 T short pulse, 24mm, 25 msec) • Cell 3 (60 T short pulse, 15 mm, 25 msec) • Cell 4 (65 T short pulse, 15 mm, 35 msec) • 60T Long Pulse, 2500 ms, 32 mm,100 msec flattop • 100T Multi Shot, 2500 ms,15mm, 20 msec above 40T • Operational to 85 T in February ‘09 • 300T Single Turn, 10 mm, 0.006 ms • Operational to 240 T (routine to 170 T)

  4. PFF Field Profiles

  5. Non-Pulsed Magnets at NHMFL-PFF available to Users • 20T SC (Zapf) • Dil-fridge, VSM, 3He, Cp…. • Magnet failed in April ‘08 • 17T SC (Singleton) • Cantilever magnetometry, transport, He3, EPR • 15T RUS (Betts) • Resonant Ultrasound, 3He • 15T Staff Lab (Crooker/Jaime/McDonald) • Optics, Cp, EPR, He4 flow • 14T PPMS (Zapf) • VSM, Cp, transport, 4He flow • 7T Split Coil Optical Access (Crooker) • Optics, 4He

  6. New Developments 2008 • 100T MS in maintenance mode • The 75 T Development Magnet filled the gap • It failed after 240+ shots above 75 T • Plans to develop a Duplex Coil to deliver similar fields • Call for proposals went out in September • 60T LP Fully Operation (to 55 T) • Very High Quality Data • TDO data is comparable to Hybrid (Sig:Noise) • Short Pulse Techniques Expanded • Cantilever measurements in L-3He on a rotator!

  7. 100 T MS Call for Proposals • Call went out 25 September (closed 31 October) • 16 Proposals Received • 6 will be selected (9 will be ranked) • Martin Greven Stanford (SEARCHING FOR QUANTUM OSCILLATIONS IN THE SINGLE-LAYER CUPRATE SUPERCONDUCTOR HgBa2Cu2O4) • Gilbert Lonzarich Caimbridge U. (FERMI SURFACE EMERGENCE IN UNDERDOPED YBa2Cu3O6+X CUPRATES) • Tito Huber Howard U. (Observation of the quantum limit of surface states of bismuth nanowires) • Greg Boebinger FSU (Quantum Criticality and Fermi Surface Reconstruction in LSCO) • Ian Fisher Stanford (Quantum oscillation in ternary oxy-pnictides ) • Eric Bauer LANL (100 T Science: Understanding the Interplay of Magnetism, Superconductivity, and Quantum Criticality) • John Singleton LANL (Detection of extra quantum oscillation frequencies in the cuprate superconductors) • Graeme Luke McMaster U. (Phase Diagram Determination of the BEC of Triplons System Sr3Cr2O8) • Jamie Manson Eastern Washington U. (High-field magnetization studies of low-dimensional quantum magnets) • Lia Krusin-Elbaum IBM Watson (Electronic structures of high-Tc Hg-based cuprate superconductors vs. hole doping: Searching for the) • Edward Yelland University of St Andrews (High pressure study of quantum oscillations in YBa2Cu4O8) • David Larbalestier NHMFL-ASC (Upper Critical Field of single crystal pnictides) • John Mydosh University of Cologne, (The role of charge degrees of freedom in Mott insulators) • Huiqiu Yuan Zhejiang University (Fermi surface topology and quantum criticality in CeRhIn5) • Michael Hoch NHMFL (Triplet-singlet gap-closing in LaCoO3: a new antiferromagnetic phase ) • Albert Migliori LANL (Pulse-echo ultrasound detection of magnetic-field-induced thermodynamic phase transitions in doped Nd(1-x)CaxB6)

  8. 60T Long Pulse Finely Tuned Techniques HTc Data from G. Lonzarich et al. Note: Data are Up and Down Sweeps at 1.2 K (no heating)

  9. 65 T Cantilever Magnetometry User: E. Bauer, Sample:USb2 60 x100 x 100 mm Sample User:I. Fisher, Sample: LaFePO Also Available: Angle Dependence at He-3 Temperatures!

  10. 2008 User statistics • Record Set with Magnet Days at PFF • 1552 total days • 173 Magnet Requests • 85 Unique PIs • 15 Non-US • 13 Post-Docs • 8 Grad students • 2 Undergraduate

  11. PFF User Program Summary • New Short Pulse technique • Cantilever M vs. B on a rotator in Liquid 3He • Record Number of Magnet Days • 1552 Magnet Days • Big Magnets • 60T LP provides new level of resolution in Pulsed Fields • 100 T call has excellent turnout • 266% of available magnet time requested!

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