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Article
Open AccessSupercooling of the A phase of 3He
Because of the extreme purity, lack of disorder, and complex order parameter, the first-order superfluid 3He A–B transition is the leading model system for first order transitions in the early universe. Here we r...
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Article
Open AccessThermal transport of helium-3 in a strongly confining channel
The investigation of transport properties in normal liquid helium-3 and its topological superfluid phases provides insights into related phenomena in electron fluids, topological materials, and putative topolo...
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Article
Open AccessThe A-B transition in superfluid helium-3 under confinement in a thin slab geometry
The influence of confinement on the phases of superfluid helium-3 is studied using the torsional pendulum method. We focus on the transition between the A and B phases, where the A phase is stabilized by confi...
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Article
Open AccessObservation of a new superfluid phase for 3He embedded in nematically ordered aerogel
In bulk superfluid 3He at zero magnetic field, two phases emerge with the B-phase stable everywhere except at high pressures and temperatures, where the A-phase is favoured. Aerogels with nanostructure smaller th...
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Article
Open AccessGenetic and epigenetic profiling of CLL disease progression reveals limited somatic evolution and suggests a relationship to memory-cell development
We examined genetic and epigenetic changes that occur during disease progression from indolent to aggressive forms of chronic lymphocytic leukemia (CLL) using serial samples from 27 patients. Analysis of DNA m...
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Article
Open AccessEvidence for the role of EP HX2 gene variants in anorexia nervosa
Anorexia nervosa (AN) and related eating disorders are complex, multifactorial neuropsychiatric conditions with likely rare and common genetic and environmental determinants. To identify genetic variants assoc...
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Article
Enrichment of cis-regulatory gene expression SNPs and methylation quantitative trait loci among bipolar disorder susceptibility variants
We conducted a systematic study of top susceptibility variants from a genome-wide association (GWA) study of bipolar disorder to gain insight into the functional consequences of genetic variation influencing d...
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Article
Genome-wide association study of bipolar disorder in European American and African American individuals
To identify bipolar disorder (BD) genetic susceptibility factors, we conducted two genome-wide association (GWA) studies: one involving a sample of individuals of European ancestry (EA; n=1001 cases; n=1033 contr...
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Article
Singleton deletions throughout the genome increase risk of bipolar disorder
An overall burden of rare structural genomic variants has not been reported in bipolar disorder (BD), although there have been reports of cases with microduplication and microdeletion. Here, we present a genom...
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Article
Experiments on 3He–4He Mixtures in Aerogel
We describe experiments on 3 He- 4 He mixtures in 98% open aerogel grown by cold-deposition (T≤80mK) of 4 He...
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Article
An Electronic Demagnetization Stage for the 0.5K to 1.8K Temperature Range
We have designed and built a demagnetization stage to operate between 1.8K and 0.5K, a somewhat unusual temperature range for adiabatic demagnetization refrigeration. The lower bound in temperature is dictated...
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Article
3He in 99.5% Porous Aerogel at the Normal-Superfluid Transition
We have used a torsional oscillator to measure the superfluid density and dissipation near the superfluid transition of 3 He in aerogel of 99.5% porosity. We used ...
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Article
Superfluidity of Pure 3He and Mixtures of 3He and 4He in Aerogel
We describe new torsional oscillator experiments on 3 He confined in 98.2% open aerogel. In one, we monitored the superfluid fraction of pure 3 ...
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Article
Determination of the sign of the electric field gradient in indium by nuclear resonance
We have studied the temperature dependence of two of the four magnetic-field perturbed NQR lines in indium. Our results indicate that the sign of the internal electric field gradient (EFG) is positive, in acco...
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Article
Acoustic coupling to NQR in the heavy fermion CeCu6
We have designed an experiment to measure the bulk nuclear spin properties of a single crystal sample of CeCu6 using a combination of pulsed ultrasound and NQR. Our preliminary studies show that there is a coupli...
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Article
An experiment to measure the effect of magnetic fields on the superfluid fraction and transition temperature of3He in aerogel
We present preliminary results from a torsional oscillator experiment designed to measure the superfluid fraction and transition temperature of3He in aerogel in magnetic fields up to 0.4 T.
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Article
The new cornell copper demagnetization stage
The persistent failure of a previous welded copper demagnetization stage to reach temperatures significantly below 100 microkelvin caused us to replace the original structure. The new stage has been machined f...
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Article
Summary of the two cryogenic techniques workshops at SYQFAS-95
Two workshops on cryogenic techniques were held as part of SYQFAS-95, one dealing with dilution refrigeration and SQUIDS, the other focused on closed-cycle cooling systems. Each consisted of several presentati.....
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Article
A geometry dependent thermal resistance between a saturated dilute3He-4He solution and sintered silver powder
We present direct measurements of the thermal resistance between a saturated dilute3He-4He solution and sintered silver powder between 5 and 150mK. Measurements obtained using different sinter geometries allow us...
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Article
Nqr experiments on Sc-Y alloys at very low temperatures
We have performed Nuclear Quadrupole Resonance (NQR) experiments on an alloy of scandium and yttrium. We find that the characteristic resonance frequencies in zero external field are 50 percent larger than in ...
