Symmetry And Group

Unconventional superconductors: experimental investigation by Gernot Goll

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By Gernot Goll

This ebook deals a accomplished precis of experiments which are specially fitted to demonstrate the order-parameter symmetry of unconventional superconductors. It in brief introduces readers to the elemental theoretical suggestions and phrases of unconventional superconductivity, by means of an in depth evaluate of experimental options and effects investigating the superconducting power hole and part, plus the pairing symmetry. This evaluate comprises measurements of particular warmth, thermal conductivity, penetration intensity and nuclearmagnetic resonance and muon-spin rotation experiments. extra, point-contact and tunnelling spectroscopy and Josephson experiments are addressed. present realizing is reviewed from the experimental  perspective. With an appendix delivering 5 tables with nearly 2 hundred references that summarize the current effects from ambient strain heavy-fermion and noncopper-oxide superconductors, the monograph presents a necessary source for extra reports during this field.

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These regimes le li ), and thermal (le , li d), diffusive (le d d). are called ballistic (le , li A summary of basic point-contact relations for different geometries and regimes can be found in [30, 31]. In contrast to the tunnelling spectroscopy, there exists always a metallic conductance without a tunnel barrier, but the intermediate regime between the purely metallic constriction and the pure tunnel junction can be modelled by a 1 Yet another difference is the displaying of data which sometimes causes confusion: for experimental reasons tunnel spectra show the differential conductance dI/dV, point-contact spectra usually the differential resistance dV/dI.

The contact resistance R0 is dominated by the Maxwell resistance RM = ρ/d. 8) with T B the bath temperature, V the applied voltage and L the Lorenz number. As an example, the differential resistance dV/dI vs voltage V of an UPt3 -Pt contact in the thermal regime is shown in Fig. 3. 45·10−8 WΩ/K2 , the voltage axis of Fig. 3 can be rescaled into a T axis and all spectra collapse together onto one “master” curve determined by the local resistivity of the contact area, which means that the voltage-dependent contact resistance resembles the temperature dependent bulk resistivity ρbulk (T ) (see Fig.

Q. Mao, Y. Maeno: Phys. Rev. Lett. 93(16), 167 004 (2004) 29, 128, 157 References 33 14. M. Tinkham: Introduction to Superconductivity (McGraw-Hill International Editions, Singapore, 1996) 11, 23, 24, 29, 56 15. C. P. Slichter: Phys. Rev. 113(6), 1504–1519 (1959) 29 16. M. C. , New York, 1969), p. 193 29 17. M. Sigrist, K. Ueda: Rev. Mod. Phys. 63, 239 (1991) 11, 14, 17, 29, 50, 61, 90, 100, 128, 137, 138 18. Y. Kitaoka, S. Kawasaki, T. Mito, Y. Kawasaki: J. Phys. Soc. Jpn. 74(1), 186–199 (2005).

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