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Various authors have shown, using nonrigorous arguments, that the one-dimensional model of Little cannot exhibit off-diagonal long-range order (ODLRO) at nonzero temperatures. Hohenberg has proven that ODLRO cannot exist at nonzero temperatures in any one- or two-dimensionalhomogeneous system....
The heat capacity (2–197 K), thermal expansion (23–160 K), and thermal conductivity (30–120 K) of solid deuteroammonia have been studied, and the enthalpy of fusionH
tr and temperatureT
tr corresponding to the triple point of ND
determined. Comparison is given of the thermal properties of NH...
The Kapitza resistanceR
between copper and3He has been measured at low pressure in a guarded cell in the temperature range 0.05–0.5 K. An extreme sensitivity to surface damage was observed. For an annealed, electropolished surfaceR
agreed within a factor of two with the acoustic mismatch...
Improvements have been made in a differential dilatometer using the three-terminal capacitance detector. The dilatometer is of copper and has been calibrated from 1.5–34 K in an extended series of observations using silicon and lithium fluoride as low-expansion reference materials. The expansion...
We measured the magnetizationM of diluteAu-V alloys of concentration varying between 0.2 and 10 at.% at 4.2 K in fields up to 60 kOe.M is proportional to the field for all fields. The specific heat, measured between 0.4 and 3 K, shows a term linear in temperature γT, with γ=3.3 and 4.6 mJ ·...
A variable transformer technique has been used to determine the linear thermal expansion coefficients of the noble metals from 4 to 30 K. The precision of the data initially was ±0.04 Å, and this was later increased to ±0.015 Å, resulting in a sensitivity of approximately 2×10−11 for relative...
It follows from scattering theory that the anomalous resistivity of dilute magnetic impurities may be written as Δρ=A−B cos 2S(π/5), whereS is a temperature-dependent spin value. This relation is experimentally verified for various systems whenS undergoes an almost complete compensation fromS...
Measurements of the penetration of flux and losses in ac fields (20–2000 cps) at 4.2 K together with quasistatic magnetization curves on three samples of Ta
having different degrees of pinning are presented. The results are explained in terms of surface shielding currents taking into...
Superconducting systems separated by a very short weak link are treated using the one-dimensional Ginzburg—Landau theory. It is shown that in the limit of extremely narrow and/or dirty links I ∼ sin Δφ. In the dirty limit we obtain the well-known expression for the Josephson tunnel current....
We have measured the speed of second soundu
2 in He II in the presence of a heat fluxQ. ForT
fλ−3.5 mK it is found thatu
2 reduces linearly withQ
2, for 2 mW/cm
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