Energy bands and fermi surface of the intermetallic compound YZn

Measurements are presented, at selected temperatures between 305 and 77 °K, of the twelve coefficients that define the low-field magnetoresistivity tensor of arsenic. A two-carrier multivalley ellipsoidal model of the energy bands is invoked to determine carrier densities and mobilities and tilt angles of the Fermi ellipsoids. In agreement with recent theoretical calculations and measurements of the de Haas–van Alphen effect, the electrons are sited in pockets tilted at +82° to the trigonal axis and holes in pockets tilted at +40°. Equal carrier densities are essentially temperature independent, ranging from 1.9 x 10 20 cm -3 at 77 °K to 2.1 x 10 20 cm -3 at 305 °K. Carrier mobility temperature dependences are close to T -1.7 , considerably greater than the expected T -1.0 , probably owing to intervalley scattering. Experimental techniques and a new method of computation are described.

Download Full-text

De Haas – van Alphen effect and Fermi surface of the intermetallic compound PtSn

Canadian Journal of Physics ◽

10.1139/p70-147 ◽

1970 ◽

Vol 48 (10) ◽

pp. 1151-1160 ◽

Cited By ~ 10

Author(s):

W. N. Cathey ◽

P. T. Coleridge ◽

J.-P. Jan

Keyword(s):

Intermetallic Compound ◽

Fermi Surface ◽

Cross Sections ◽

Experimental Results ◽

The Other ◽

Platinum Atom ◽

Spin Splitting ◽

Approximate Determination ◽

Formula Unit

Extremal cross sections of the Fermi surface of the intermetallic compound PtSn (NiAs structure) have been determined by means of the de Haas – van Alphen effect. The Fermi surface proposed here is similar to that found in isostructural AuSn by Edwards et al. Several of the frequencies have been inverted to yield the profile of the corresponding sheets of the Fermi surface. An approximate determination of the dimensions of the other sheets shows that the observed Fermi surface encloses 4.60 ± 0.27 electrons per formula unit; this suggests that one or several sheets of the Fermi surface containing 0.6 d-band holes per platinum atom have remained undetected. Some cyclotron masses have been measured and to explain all the features of the experimental results, it is necessary to invoke spin splitting with a g factor different from 2, and to postulate magnetic breakdown.

Download Full-text

Energy bands and Fermi surface of AuSn

Physical Review B ◽

10.1103/physrevb.9.5071 ◽

1974 ◽

Vol 9 (12) ◽

pp. 5071-5076 ◽

Cited By ~ 10

Author(s):

Francis Arlinghaus

Keyword(s):

Fermi Surface ◽

Energy Bands

Download Full-text

Energy bands, fermi surface and density of states in the superconducting state of La2−xSrxCuO4

Solid State Communications ◽

10.1016/0038-1098(94)90261-5 ◽

1994 ◽

Vol 91 (2) ◽

pp. 97-100 ◽

Cited By ~ 27

Author(s):

Hiroshi Kamimura ◽

Hideki Ushio

Keyword(s):

Fermi Surface ◽

Density Of States ◽

Superconducting State ◽

Energy Bands

Download Full-text

Energy bands, fermi surface and lattice instability in VS

Solid State Communications ◽

10.1016/0038-1098(74)90412-8 ◽

1974 ◽

Vol 14 (10) ◽

pp. 1003-1006 ◽

Cited By ~ 13

Author(s):

S.H. Liu ◽

W.B. England ◽

H.W. Myron

Keyword(s):

Fermi Surface ◽

Energy Bands ◽

Lattice Instability

Download Full-text

SUPERCONDUCTIVITY IN TWO-BAND SYSTEM WITH LOW CARRIER DENSITY

International Journal of Modern Physics B ◽

10.1142/s0217979205029432 ◽

2005 ◽

Vol 19 (06) ◽

pp. 929-970 ◽

Cited By ~ 8

Author(s):

M. E. PALISTRANT

Keyword(s):

Thermodynamic Properties ◽

Fermi Surface ◽

Band System ◽

Functional Integration ◽

Bose Condensation ◽

Charge Carriers ◽

Mean Field Approximation ◽

Cooper Pairs ◽

Energy Bands ◽

Theory Of Superconductivity

The review of works about the study of the thermodynamic properties of the superconductors with energy bands overlapping on Fermi surface is done. The base of the review is Moscalenco's model1 with the formation of cooper pairs of electrons inside each energy band and their transition as a whole entity from one band to another. The model was generalized in order to consider the interband pairings of electrons in addition to the pairings that have been taken into account in Ref. 1. The main system of equations in this theory of superconductivity is derived for the two-band systems at arbitrary density of charge carriers (including the very low densities). The detailed studies of dependences of the temperature of superconducting transition TC, the jump of heat capacity (CS-CN), as well as the chemical potential μ on the density of charge carriers are made. Singularities in the behavior of the two-band superconductors at low densities of charge carriers (μ~TC) are revealed. There has been studies on the influence of the additional pairings of electrons that result in the formation of the cooper pairs of electrons from different energy bands on the thermodynamic properties of the system. Both phonon and non-phonon mechanisms of superconductivity in the BCS scenario of the formation of superconducting pairs (μ>0) have been taken into account. The theory of superconductivity in the mean-field approximation at T = 0 in the picture of Bose condensation of localized pairs (Schaffroth's scenario μ<0) is built. The technique of functional integration with regard to the two-band system is developed and the crossover from Fermi to Bose picture of elementary excitations at T≠0 with the two-particle bound state in the system has been shown. The temperature of Bose condensation TK is determined and the influence of the overlapping of energy bands on Fermi surface onto Bose condensation of localized pairs is studied.

Download Full-text