Muon depolarization in liquid3He

We report the first measurements of the positive-muon spin depolarization in liquid³He. The relaxation of the muon and muonium precession has been studied in transverse, longitudinal, and zero magnetic fields in the temperature range 0.5–2.5 K. The results are discussed in terms of two different depolarization mechanisms: recombinational depolarization (i.e. slow muonium formation) and magnetic relaxation due to the³He nuclear magnetic moments.     

Phase transitions in liquid 3He

The phase transitions of liquid 3He are described by truncations of an exact nonperturbative renormalization group equation. The location of the first-order transition lines and the jump in the order parameter are computed quantitatively. At the triple point we find indications of partially universal behavior. We suggest experiments that could help to determine the effective interactions between fermion pairs.     

Dynamic structure function of liquid 3He

The dynamic structure function S(Q, ω) of liquid ³He is evaluated in the impulse approximation, based on a theoretically calculated momentum distribution n(k). The gap of n(k) at the Fermi surface gives rise to discontinuities in the slope of S(Q = const., ω) which may be detectable in neutron- or γ-ray scattering experiments.     

Thermal conductivity of spin-polarized liquid 3He

We present the first measurements of the thermal conductivity of spin-polarized normal liquid 3He. Using the rapid melting technique to produce nuclear polarizations up to 0.7, and a vibrating wire both as a heater and a thermometer, we show that, unlike the viscosity, the conductivity increases much less than predicted for s-wave scattering. We suggest that this might be due to a small probability for head-on collisions between quasiparticles.     

The superfluidd transition temperature of a Fermi liquid: 3He and 3He4He mixtures

The superfluid transitions temperature is calculated from the microscopic theory of a Fermi liquid in terms of the Landau parameters and one unknown scale factor. Determining the latter from the observed transition in ³He leads to an estimate that the superfluid transition in ³He⁴He mixtures may be presently observable.     

饱和液体氦-3的粘度性质

文中揭示了低温液态氦-3在其饱和蒸气压下粘度随温度状态参数变化的反常规律,首次提出了3He在0.003K至其临界温度3.3157K温区内完整的气液相平衡曲线粘度方程。该方程计算值与高精度实验数据偏差小于±0.7%,并且在极低温条件下光滑过渡为由量子理论预测的理论极限。这项工作是研究氦-3在整个温度和压力区间上粘度性质行为特性的起点,不仅是构建全区间粘度方程的重要边界,而且对于理解费米-狄拉克量子统计规律在低温下的作用规律具有指导意义。     

The polarization energy of normal liquid 3He

We present new quantum Monte Carlo calculations of the ground-state energy of liquid ³He using backflow and 3-body wavefunctions and twist-averaged boundary conditions. We estimate the effects of the 3-body potential and compare to experimental measurements of the unpolarized equation of state and the magnetic susceptibility. There is still a large discrepancy with respect to the magnetic susceptibility, requiring either improved nodal surfaces or going beyond the fixed-node method.     

Binding of3He atoms to liquid helium

Summary We calculate the³He−⁴He chemical potential and change in volume in bulk liquid⁴He employing integral equation and Monte Carlo procedures. Detailed numerical results on these quantities and their dependence on bulk density and on the isotopic-mass difference are presented and discussed. This work has been supported by the Deutsche Forschungsgemeinschaft under grant Ri 267 and by the U.S. Department of energy under contract DE-AC 02-76 ER03077 and by the NSF under grant DMR-77-18329.     

Damping of zero sound in liquid3He

The dynamic structure factor in liquid³He is calculated within the framework of Dissipative Linear Response (DLR) equations. The effective interaction is represented by the Landau parameters up tol=2 and the Random Phase Approximation (RPA)-scattering amplitudes are evaluated in thes–p–d approximation. The dissipative linear response operator is calculated on the basis of RPA solutions of undamped zero sound using integral equation techniques.The dynamical structure factor has a strong resonance structure whose width agrees with measurements of the attenuation coefficient for small momentum transfers. At larger values of momentum transfer, where the dynamical structure factor has been directly measured, the Landau parameters do not give more than a qualitative agreement with the data.     

On a microscopic theory of liquid 3He

We present a microscopic calculation of the wave number dependent quasiparticle interaction and its variation with pressure in liquid ³He. Calculation of the variation of the Landau parameters F^s₀ and F^a₀ with pressure is also presented. The theory is capable of reproducing qualitatively some of the salient features seen in experiments in liquid ³He.     

Zero sound mode in normal liquid 3He

Inelastic x-ray scattering has been utilized to study the elementary excitations of normal liquid 3He at the temperature T=1.10+/-0.05 K and saturated vapor pressure in the wave vector range 0.15相似文献   

Anomalous positive ion mobility in liquid 3He

Measurements of the mobility μ₊ of positive ions in liquid ³He under a pressure of 1 bar in the temperature range 0.05 < T < 0.6K exhibit a sharp peak in μ₊(T) near 0.2K and irreproducible behaviour at lower temperatures.