P. L. Li

Bio: P. L. Li is an academic researcher. The author has contributed to research in topics: Crystal field theory & Magnetic shape-memory alloy. The author has an hindex of 2, co-authored 2 publications receiving 21 citations.

Magnetic Anisotropy in Single Crystals of Zn–Mn and Zn–Cr

Abstract: We have extended the low temperature magnetic anisotropy measurements on single crystals of zinc containing up to 600 p.p.m. manganese from magnetic fields of 9 to 56 kG. The crystal field splitting parameters determined at low magnetic fields also characterizes the magnetic anisotropy at high magnetic fields. Manganese–manganese interaction effects are observed in the magnetic anisotropy at manganese concentrations greater than 300 p.p.m. Low temperature magnetic anisotropy measurements on single crystals of zinc containing up to 164 p.p.m. chromium are reported and indicate a crystal field splitting of 0.16 K for the chromium ion.

Formation of localized moments in metals: experimental bulk properties

Abstract: This review presents systematically most of the experimental data which have been obtained from measurements of bulk properties of alloys and intermetallic compounds containing atoms of transition metals, rare earths or actinides which can be considered as non-interacting with each other. Criteria for the observation of effects due to non-interacting atoms are given. Data are reported from measurements of magnetic properties, electrical resistivity, specific heat, superconductivity, thermoelectric power, thermal conductivity, thermal expansion and compressibility, de Haas-van Alphen and Hall effects and optical properties. Systematic trends in experimental behaviour can be observed in many of these data, and using this observation experimental parameters are defined which are used to classify the data before attempting a comparison with theories.

Kondo effect and impurity interactions in the resistivity of diluteZnMn alloys

Abstract: The electrical resistivity of diluteZnMn alloys (c=1.7–2400 ppm Mn) has been investigated in the temperature range from 0.05 to 14 K. For the most dilute sample, single-impurity Kondo behavior is found, well described by the Hamann formula withT K=0.9 K,S=3/2. ForT<50 mK, aT 2 law with θ R =0.3 K is expected. In the dilute limit the Kondo slope is −(1/c)d(Δρ)/d(logT)=3.7±0.2 µΩ-cm/at % dec. In the more highly concentrated alloys, the slope decreases with increasing c and the lnT-like variation of the Kondo resistivity roughly terminates near a temperatureT W(c),T W being related to the average Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction strength between the Mn impurities. For 20 ppm ≤c ≤ 1000 ppm, the resistivity slightly decreases at low temperatures and a broad resistivity maximum is observed atT m (c), withT m ∝c 0.7. ForT 2

The influence of scattering on magnetic breakdown

Abstract: A study of magnetic breakdown between the third zone needles and second zone monster surfaces in the three zinc alloy systemsZnMn,ZnCr, andZnFe shows that the tunneling probability is strongly reduced by electron scattering and that the breakdown fieldH 0 increases linearly with the Dingle temperatureX with a scaling factor of 0.36 kG/K for all alloys. This phenomenon may be understood if we allow the electrons to be scattered during their tunneling through the forbidden region ofk space. A simple semiclassical calculation of this effect yields an expression for the breakdown probability corrected from the conventional expression toP=exp[−(1/H)(H0+αX)], where α is a constant dependent only on the band structure of the solvent.