1. Status and Highlights of the High B/T Program
(1) Unique Ultra-Low Temperature Capabilities:
High sensitivity pulsed NMR low temperature electronics (preamplifier)
Sample rotator at mK temperatures: anisotropy of FQE
(2) Program Growth:
Added 10 mK, 10 T fast-turn around capability
Initiated user expts in bay 2 of UF Microkelvin Lab. (extends T to below 0.1 mK)
Significant increase in number of users
(3) Prominent Publications:
Ultra-Low T study of BEC Condensation of magnons (V. Zapf et al.)
Crossover from non-universal scaling regime
in FQHE plateau (W. Pan, D. Tsui et al.)
Magnetism of 2D quantum magnets
(M. Meisel (UF),
A. Feher et al. (Šafárik Univ., Slovakia) et al.)
Citations:
Yin, L.; Xia, J.S.; Zapf, V.S.; Sullivan, N.S. and Paduan-Filho, A., A direct measurement of the Bose-Einstein Condensation universality class in NiCl2-4SC(NH2)2 at ultra-low temperatures, Phys. Rev. Lett., 101, (2008); Yin, L.; Xia, J.S.; Sullivan, N.S.; Zapf, V.S. and Paduan-Filho, A., Magnetic Susceptibility Measurements at Ultra-Low Temperatures, J. Low Temp. Phys., 158, (2010)
Li, W.; Xia, J.S.; Vicente, C.; Sullivan, N.S.; Pan, W.; Tsui, D.C.; Pfeiffer, L.N. and West, K.W., Crossover from non-universal scaling regime to universal scaling regime in quantum Hall plateau transition, Phys. Rev. B, 81, (2010)
Orendáčová, A.; Čižmár, E.; Sedláková, L.; Hanko, J.; Kajňaková, M.; Orendáč, M.; Feher, A.; Xia, J.S.; Yin, L.; Pajerowski, D.M.; Meisel, M.W.; Zeleňák, V.; Zvyagin, S. and Wosnitza, J., Interplay of frustration and magnetic field in the two-dimensional quantum antiferromagnet Cu(tn)Cl2, Phys. Rev. B, 80, (2009)

2. Vision for the High B/T Program
I. Development of
(a) New technologies to extend parameter space
High Pressure (GPa) Capability at Very Low T
 meet user interests, e.g. P dependence of QPT (at ultra-low T), magnetization, quantum magnets, NQR correlated electron systems  would be unique (need dedicated expert)
(b) Develop ultra-high sensitivity/Low Noise capability
Translate low T/high B NMR electronics to other systems for advanced sensitivity, e.g. magnetometry, nano-engineered devices
(heavy fermions, half-metals…)
II. Consolidate Bay 2 for full-time user activity
(a) Add 16 T Magnet from Bay 3 (after commissioning 20 T in Bay 3)
plus small insert sweep magnet (engineering intensive)
 provide highest B/T > T/K (Bay 3: 4.104)
 New physics for high static spin polarizations
(b) Upgrade Refrigerator (Mech. Pumps) & magnet power supply
I.(a) High pressure capability in Tallahassee could be extended to Gainesville. Challenge is to provide good thermal contact at low temperatures. Needs dedicated development and support.
I.(b) NMR preamplifier is broad band pHEMT device that operates in high B down to ~ 0.3K (internal heating limit). Could be adapted for use in ac magnetometry and ac transport lowering noise figures considerably. Needs electronic engineering support from physics shops.
II.(a) 16.5 T (good homogeneity) magnet form bay 3 available after commissioning of 20T magnet in bay 3. The 16 T could be installed in bay 2 but would require significant modification of dewar and internal geometry (height of DR with respect to demag. stage.) Engineering intensive and the group could not do this alone.
Advantage for bay 2: Cu demag. stage allows for cooling to ~ 0.1 mK (lower heat capacity) and would extend range of B/T by a large factor.