Spin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal
| Autor: | J Wosnitza, V M Gvozdikov, J Hagel, O Ignatchik, B Bergk, P J Meeson, J A Schlueter, H Davis, R W Winter, G L Gard |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Physics
Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Zero (complex analysis) FOS: Physical sciences General Physics and Astronomy Quantum oscillations 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Signal Condensed Matter - Other Condensed Matter Condensed Matter - Strongly Correlated Electrons Amplitude Condensed Matter::Superconductivity 0103 physical sciences Harmonic Organic superconductor Condensed Matter::Strongly Correlated Electrons Anomaly (physics) 010306 general physics 0210 nano-technology Other Condensed Matter (cond-mat.other) Spin-½ |
| Zdroj: | New Journal of Physics 10(2008), 083032 |
| Popis: | We report on an anomalous behavior of the spin-splitting zeros in the de Haasvan Alphen (dHvA) signal of a quasi-two-dimensional organic superconductor. The zeros as well as the angular dependence of the amplitude of the second harmonic deviate remarkably from the standard LifshitzKosevich (LK) prediction. In contrast, the angular dependence of the fundamental dHvA amplitude as well as the spin-splitting zeros of the Shubnikovde Haas (SdH) signal follow the LK theory. We can explain this behavior of the dHvA signal by small chemical-potential (CP) oscillations and find a very good agreement between theory and experiment. A detailed wave-shape analysis of the dHvA oscillations corroborates the existence of an oscillating CP. We discuss the absence of the above spin-zero effect in the SdH signal and argue that in k-(BEDT-TTF)2SF5CH2CF2SO3 it can be explained by an incoherent variable range hopping interlayer transport which is insensitive to the small CP oscillations. |
| Databáze: | OpenAIRE |
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