Fermi Surface and Quantum Critical Phenomena of by Carsten Matthias Putzke

By Carsten Matthias Putzke

This thesis offers a close creation to quantum oscillation size and research and gives a connection among Fermi floor houses and superconductivity in high-temperature superconductors. It additionally discusses the sphere of iron-based superconductors and assessments the types for the looks of nodes within the superconducting hole of a 111-type pnictide utilizing quantum oscillation measurements mixed with band constitution calculation.
The related measurements have been performed to figure out the quasiparticle mass in BaFe2(As1-xPx)2, that is strongly better on the anticipated quantum serious aspect. whereas the decrease superconducting severe box indicates proof of quantum criticality, the higher superconducting serious box isn't encouraged through the quantum severe aspect. those findings contradict traditional theories, demonstrating the necessity for a theoretical therapy of quantum serious superconductors, which has no longer been addressed to date.
The quest to find comparable proof within the cuprates demands the appliance of maximum stipulations. As such, quantum oscillation measurements have been played lower than excessive strain in a excessive magnetic box, revealing a unfavourable correlation among quasiparticle mass and superconducting severe temperature.

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35) which is proportional to the external field E. 36) where we have used Ohms law in the last step. We see that the electrical conductivity σ of a metal is expected to be proportional to the carrier concentration and life time. The mean life time of a carrier is similar to the scattering time that we found in the description of the dHvA effect. While for the measurements of quantum oscillations samples with large τ as found from the residual resistivity σ −1 (T = 0) are beneficial, the two values are not identical.

Wilhelm, K. Neumaier, Y. Tokiwa, O. Trovarelli, C. Geibel, F. Steglich, C. Pepin, P. Coleman, Nature 424, 524 (2003) S. Sachdev, J. Ye, Phys. Rev. Lett. 69, 2411 (1992) A. Chubukov, S. Sachdev, J. Ye, Phys. Rev. B 49, 11919 (1994) Chapter 3 Experimental Setup In this chapter will turn to the experimental procedures used in this work. We will start by looking at the external parameters temperature, magnetic field and hydrostatic pressure which were used to tune the properties of the measured materials, reach the ground state at low temperature or suppress the superconducting ground state.

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