Magnetic breakdown and quantum interference in the quasi-two-dimensional superconductor κ-(BEDT-TTF)2Cu(NCS)2 in high magnetic fields

Journal of Physics Condensed Matter

Volumn 8, Issue 29, 1996, Pages 5415-5435

  Harrison, N ^a   Caulfield, J ^b   Singleton, J ^b   Reinders, P H P ^a   Herlach, F ^a   Hayes, W ^b   Kurmoo, M ^c   Day, P ^c  

^a UNIVERSITY OF LEUVEN   (Belgium)

^b UNIVERSITY OF OXFORD   (United Kingdom)

^c DAVY FARADAY RESEARCH LABORATORY   (United Kingdom)

Author keywords

[No Author keywords available]

Indexed keywords

CALCULATIONS; CHARGE TRANSFER; COMPUTER SIMULATION; ELECTRONIC DENSITY OF STATES; FERMI SURFACE; FREQUENCIES; MAGNETIC FIELDS; MAGNETORESISTANCE; MATHEMATICAL MODELS; OSCILLATIONS; QUANTUM THEORY; SALTS;

BIS ETHYLENEDITHIO TETRAHIAVULVALENE; FREQUENCY MIXING EFFECTS; HIGH FIELD MAGNETOTRANSPORT SPECTRUM; MAGNETIC BREAKDOWN; QUANTUM INTERFERENCE; QUASI TWO DIMENSIONAL SYSTEM;

SUPERCONDUCTING MATERIALS;

EID: 0030192470     PISSN: 09538984     EISSN: None     Source Type: Journal    
DOI: 10.1088/0953-8984/8/29/016     Document Type: Article

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31. q ≈ 50°. However, such an effect is without precedent; for example the most prominent SdH oscillations in the α-phase (BEDT-TTF) salts involve four Bragg reflections and yet no comparable phase shifts are seen. Therefore MB appears to be the most likely cause of this effect in the current work (Dr Anton Polisskii, private communication).
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33. The 'apparent' noise in the Fourier transforms of figure 7 originates from errors in the calculation of the free energy. This is due mainly to the limited resolution in energy space to which the DOS was calculated.
34. 2 f′ dε was derived for SdH oscillations in high magnetic fields in the case where the oscillatory magnetoresistance was comparable in size to or bigger than the classical background magnetoresistance. The derivation of the formula involved assumptions which are valid specifically for the Q2D closed section of the Fermi surface of the α-phase BEDT-TTF salts [6]; the effects of MB were not included. The use of equation (8), which is generally valid under the conditions stated, therefore seems more appropriate.
35. -1. For one revolution of the β orbit (for example) this corresponds to a longitudinal displacement of ∼1 nm at 40 T. In comparison, the de Broglie wavelength will always be longer than the longitudinal lattice parameter ∼1.6 nm.
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