J.A. Rayne

Specific heat of platinum from 1.4 to 100°K

Abstract The specific heat of high purity platinum has been measured from 1.4 to 100°K. No anomalous temperature dependence of the lattice heat capacity is observed. The corresponding variation of the Debye temperature is compared to that calculated from elastic data using a central force model.

Lattice expansion of Bi2Te3 from 4.2 K to 600 K

Abstract The lattice expansion of single crystal Bi 2 Te 3 has been measured from 4.2 K to 600 K using X-ray techniques. Considerable anisotropy is observed in the resulting expansion coefficients, α | being approximately double α ⊥ at 300 K. No anomalous temperature dependence is observed in either coefficient as a function of carrier density or carrier type.

Ultrasonic attenuation in linear antiferromagnet CsNiCl3

Attenuation measurements in the linear antiferromagnet CsNiCl3 show an anomaly at TN=4.36 K. The critical behaviour is consistent with the exponent η=43 for an anistropic three-dimensional system. A broad attenuation peak near 30 K is attributed to the one-dimensional chains.

Ultrasonic determination of the phase diagram in CsNiCl3

Abstract The phase diagram of CsNiCl 3 has been determined ultrasonically. There is a quadratic increase in the Neel temperature with increasing magnetic field. A possible spin-flop transition has been detected at approximately 22 kG.

Electronic contribution to the normal state ultrasonic attenuation in aluminum

Abstract The electronic contribution to the normal state ultrasonic attenuation of longitudinal waves propagating in aluminum has been measured over a wide range of ql . For ql ⪢ 1 the limiting values of α / f differ from the free electron predictions. In the limit ql ⪡1 the data can be fitted to the free electron theory with an isotropic mean free path close to that obtained from resistivity measurements.

Temperature Dependence of Electron Mean Free Path in Molybdenum from Ultrasonic Measurements

The electronic contribution to the attenuation of sound waves is dependent on the product a = ql, q being the phonon wave number and l the electron mean free path.1 For ql » 1, the attenuation parameter (frac{alpha }{nu }) ν being the phonon frequency, is independent of ql. In general, the attenuation at arbitrary ql can be expressed in the form n n

Resistivity of Bi2Te3 from 1.3 K to 300 K

frac{alpha }{nu } = mathop {lim }limits_{qell to infty } left( {frac{alpha }{nu }} right){text{ }}Pleft( {qell } right)

Lattice parameters of n-and p-type Bi2Te3

n n(1) n nwhere P(ql) tends to unity for large ql.