Observation of suppressed viscosity in the normal state of He due to superfluid fluctuations.

Evidence of fluctuations in transport have long been predicted in He. They are expected to contribute only within 100μK of T and play a vital role in the theoretical modeling of ordering; they encode details about the Fermi liquid parameters, pairing symmetry, and scattering phase shifts. It is expected that they will be of crucial importance for transport probes of the topologically nontrivial features of superfluid He under strong confinement.

Gap-Opening Transition in Dirac Semimetal ZrTe_{5}.

We apply ^{125}Te nuclear magnetic resonance (NMR) spectroscopy to investigate the Dirac semimetal ZrTe_{5}. With the NMR magnetic field parallel to the b axis, we observe significant quantum magnetic effects. These include an abrupt drop at 150 K in spin-lattice relaxation rate.

Path-Dependent Supercooling of the ^{3}He Superfluid A-B Transition.

We examine the discontinuous first-order superfluid ^{3}He A to B transition in the vicinity of the polycritical point (2.232 mK and 21.22 bar).

Magnetocaloric Effect in a Frustrated Gd-Garnet with No Long-Range Magnetic Order.

In this paper, the hyperkagome lattice of Gd spins in a garnet compound, GdCrGaO, is studied using bulk measurements and density functional computations, and the observation of large magnetocaloric effect corresponding to an entropy change, Δ = 45 J kgK (≈ 45 J molK) at 2 K, 8 T is reported. Though the compound defies long-range magnetic order down to 0.4 K, a broad feature below 10 K is observed in the specific heat with two low temperature anomalies at * ≈ 0.

Structure Change and Rattling Dynamics in CuSbS Tetrahedrite: an NMR Study.

We present a Cu and Cu NMR study of CuSbS, the basis for tetrahedrite thermoelectric materials. In addition to electronic changes observed at the T = 88 K metal-insulator transition, we find that locally there are significant structural changes occurring as the temperature extends above T, which we associate with Cu atom displacements away from symmetry positions. Spin-lattice relaxation rates (1/ T) are dominated by a quadrupolar process indicating anharmonic vibrational dynamics both above and below T.

Native defects and impurity band behavior in half-Heusler thermoelectric NbFeSb.

To investigate the electronic behavior and magnetic properties of NbFeSb, we have performed 93Nb NMR, specific heat and magnetic measurements on NbFeSb samples heat treated at high temperatures. Magnetic measurements combined with an observed Schottky anomaly and changes in the NMR line width indicate the presence of a 0.2% concentrated native magnetic defect in stoichiometric NbFeSb samples.