THE STUDY OF THE MAGNETIC BREAKDOWN EFFECT AS A FUNCTION OF ANGLE IN THE ORGANIC CONDUCTOR K- (BEDT-TTF)2Cu(NCS)2 IN HIGH MAGNETIC FIELDS

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3355-3359
Author(s):  
I. MIHUT ◽  
C. C. AGOSTA ◽  
C. H. MIELKE ◽  
M. TOKOMOTO
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Spin Splitting ◽  
High Magnetic Fields ◽  
Organic Conductor ◽  
Cross Sectional ◽  
Tank Circuit ◽  
Quantum Oscillations ◽  
Magnetic Breakdown ◽  
Splitting Factor

The magnetic breakdown effect can be seen by the growth of new frequencies in the quantum oscillations in clean metals as a function of magnetic field. We have studied the variation of the amplitudes in the quantum oscillations in the resistance (the Shubnikov-de Haas effect) as a function of angle in the quasi-two dimensional-organic conductor κ-(BEDT-TTF)2Cu(NCS)2. The measurements were made by means of a radio frequency (rf) tank circuit (~ 50 MHz) at very high magnetic fields(50T-60T) and low temperature(500 mK). The geometry of the rf excitation we used excited in-plane currents, and therefore we measured the in-plane resistivity. In contrast to conventional transport measurements that measure the inter-plane resistivity, the in-plane resistivity is dominated by the magnetic breakdown frequencies. As a result we measured much higher breakdown frequency amplitudes than conventional transport experiments. As is expected, the angular dependence of the Shubnikov-de Haas frequencies have a 1/cosθ behavior. This is due to the change of the cross sectional area of the tubular Fermi surface as the angle with respect to the magnetic field is changed. The amplitude of the oscillations changes due to the spin splitting factor which takes into account the ratio between the spin splitting and the energy spacing of the Landau levels which also has 1/cosθ behavior. We show that our data agree with the semi-classical theory (Lifshitz-Kosevich formula).

On the Anomalous Angular Variation of the Spin Splitting Factor of Bismuth

1972 ◽  
Vol 32 (3) ◽  
pp. 653-655 ◽  
Author(s):  
Katsuyoshi Toyoda ◽  
Yasuji Sawada ◽  
Hajimu Kawamura
Keyword(s):  
Spin Splitting ◽  
Angular Variation ◽  
Splitting Factor

Spin–spin interaction in f5 electron configurations

1969 ◽  
Vol 47 (24) ◽  
pp. 2779-2783 ◽  
Author(s):  
Gulzari Malli ◽  
K. M. S. Saxena
Keyword(s):  
Order Perturbation ◽  
Spin Splitting ◽  
Spin Interaction ◽  
Electron Configuration ◽  
Matrix Elements ◽  
First Order ◽  
Hartree Fock ◽  
Splitting Factor ◽  
Complete Matrix ◽  
First Order Perturbation

The complete matrix of the spin–spin interaction for the f5 electron configuration is evaluated for general usage. The results of the diagonal matrix elements are tabulated here in terms of the corresponding spin–spin splitting factor for usage in the first-order perturbation calculations. These are used to evaluate the Hartree–Fock values of the splitting factors for Pm(4f5), Sm3+ (4f5), Tb(4f9), and Dy3+ (4f9).

Conduction electron g-factor in tungsten from quantum oscillations in ultrasonic velocity

1977 ◽  
Vol 55 (4) ◽  
pp. 356-363 ◽  
Author(s):  
J. M. Perz
Keyword(s):  
Magnetic Field ◽  
Field Dependence ◽  
Second Harmonic ◽  
Ultrasonic Waves ◽  
Spin Splitting ◽  
Harmonic Oscillations ◽  
Minimum Area ◽  
Quantum Oscillations ◽  
Splitting Factor ◽  
Harmonic Content

From an analysis of the field dependence and harmonic content of quantum oscillations in the velocity of transverse ultrasonic waves associated with the ellipsoidal hole pockets at N in tungsten, the spin-splitting factor g = 1.73 ± 0.07 has been determined for central orbits near that of minimum area, i.e. with magnetic field H along a cubic axis [100]. This is consistent with the observed disappearance of the second harmonic oscillations for field nearly midway between two cubic axes, which implies g = 1.82 ± 0.07 for the relevant orbit.

Determination of the spin-splitting factor gc for Landau levels from the first three harmonics in the de Haas–van Alphen effect

1976 ◽  
Vol 54 (24) ◽  
pp. 2445-2455 ◽  
Author(s):  
A. V. Gold ◽  
P. W. Schmor
Keyword(s):  
Band Structure ◽  
Fermi Surface ◽  
Landau Levels ◽  
Spin Splitting ◽  
Structure Model ◽  
The Third ◽  
Splitting Factor ◽  
Dimensionless Ratio ◽  
Band Structure Model

A simple and convenient method is proposed for extracting the spin-splitting factors gc associated with extremal orbits around the Fermi surface from knowledge of the amplitudes Ar of the first three harmonics in the de Haas–van Alphen effect. In the approach suggested here, the quantity of prime interest is the dimensionless ratio α = A22/A1A3, which is independent of both the detailed shape of the Fermi surface and the Dingle temperature. Information about the relative phases of the harmonics allows corrections to be made for the Shoenberg magnetic interaction.In a first application of this three-harmonic method, the dHνA waveform has been studied in disk-shaped samples of Pb using a sensitive magnetoresistive-probe technique, and gc has been determined for the orbits ν and ν′ on the third-zone electron surface. We have also attempted to calculate the splitting factors within the framework of the 4 OPW band-structure model of Anderson, O'Sullivan, and Schirber. However, the simplification of using 4 OPW's throughout the Brillouin zone is found to lead to serious errors and inconsistencies as far as these differential magnetic quantities are concerned.

EXPERIMENTAL CONDUCTION ELECTRON SPIN-SPLITTING FACTORS IN MOLYBDENUM AND OSMIUM

1993 ◽  
Vol 07 (01n03) ◽  
pp. 244-247
Author(s):  
O. Z. OSTAPIAK ◽  
J. M. PERZ ◽  
V. PLUZHNIKOV ◽  
V. E. STARTSEV
Keyword(s):  
Electron Spin ◽  
Conduction Electron ◽  
Theoretical Calculations ◽  
Spin Splitting ◽  
Quantum Oscillations ◽  
Exchange Correlation ◽  
Good Agreement ◽  
G Factors

Conduction electron spin-splitting factors have been determined from spin-zeros in quantum oscillations in magnetostriction arising from orbits on the lenses in Mo, and from harmonic ratios of oscillations due to the zone 7 ellipsoids in Os. The Mo results are in qualitative disagreement with results of LMTO calculations; a possible explanation of the failure of the theory is proposed. The Os results are in good agreement with theoretical calculations of g factors and exchange-correlation enhancement.

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