By Joachim Wosnitza

ISBN-10: 3540606742

ISBN-13: 9783540606741

Fermi Surfaces of Low-Dimensional natural Metals and Superconductors is an creation to quasi-one- and quasi-two-dimensional natural metals and a evaluation of the present wisdom at the digital constitution of those fabrics. The relevant structural, digital, and superconducting homes are defined and illustrated with many examples. The ebook introduces the elemental theoretical strategies beneficial for the certainty of the experimental suggestions and stories intimately contemporary leads to the research of the Fermi floor topology. The e-book is meant either as an creation and as a reference publication for lively researchers.

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Extra info for Fermi Surfaces of Low-Dimensional Organic Metals and Superconductors

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B) Electronic part of C after subtraction of the phononic T 3 part. From [113] From tunneling measurements some controversial results for the energy gap were obtained. 6meV for (TMTSF)2PF6 [114] and a similar value for (TMTSF)2C104 [115]. 4 meV for the gap in excellent agreement with the BCS relation and consistent with the above stated C value [116]. 5 ! 5 T {K) Fig. 12. Proton nuclear relaxation rate 1/:/71 vs temperature of (TMTSF)2CIO4. The solid line is a calculation with an anisotropic order parameter.

The main results of a first preliminary [159] and a later refined calculation [160] are shown in Fig. 18. Since in this treatment the out-of-plane interactions have been taken into account as well a true 3D energy dispersion and FS have been obtained. In the first approximation shown in Fig. 18a obviously too many simplifications have been employed. The FS is far from being the inherently perfect 2D cylinder of Fig. 17. Small closed portions and even open sheets coexist leading to a more pronounced 3D topology.

2). As a last example for a calculated band structure in this chapter, Fig. 20 shows the result for an c~-phase salt, namely c~-(ET)2KHg(SCN)a, based on the crystal structure at ~ 1 0 0 K [141]. The other members of the c~-(ET)2MHg(SCN)4 family are expected to have almost the same FS. 6 -O'C-" BV Z F X V Fig. 20. Calculated band structure and Fermi surface of a-(ET)2KHg(SCN)4. From [141] the extremal cross-sectional area of the FS might be slightly changed due to the different unit cell volumes.

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Fermi Surfaces of Low-Dimensional Organic Metals and Superconductors by Joachim Wosnitza


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