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

By Joachim Wosnitza

Fermi Surfaces of Low-Dimensional natural Metals and Superconductors is an creation to quasi-one- and quasi-two-dimensional natural metals and a assessment of the present wisdom at the digital constitution of those fabrics. The crucial structural, digital, and superconducting houses are defined and illustrated with many examples. The e-book introduces the elemental theoretical recommendations invaluable for the certainty of the experimental innovations and reports intimately contemporary ends up in the research of the Fermi floor topology. The ebook is meant either as an creation and as a reference ebook for lively researchers.

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The stoichiometry of the ET salts can have a wide variety denoted by (ET)mX~. The valence of ET can be changed rather easily. 3 Quasi Two-Dimensional Systems 29 X represents a monovalent anion. Unlike (TMTSF)2X, the crystal structure of the E T salts can vary a lot. A few examples will be presented in the next section. 5{61 C ( 8 S(21 ! ~ ~ [4) S(8) (tOB) c(gA) S(5) SII) SI3) C{~ S(~)C(4) S(2)r,f,1C(21S(4) ~ C I 9 A C(7")~to) S(7) ¢ . _ ) 5ll) 5(3) C(5) ~t~"~CllOA) C(9B} Fig. 13. ET molecule conformation taken in a charge transfer complex.

24. Tc dependence in the fl-type (ET)2X salts with linear, triatomic anions vs anion length (sum of bond length and twice the van der Waals radius of the terminal anion). From [126] 42 2. Some Principal Properties The largest pressure dependence yet observed for any superconductor is found in n-(ET)2Cu(NCS)2 with A T c / A P ~ - 3 K / k b a r [177]. , the direction perpendicular to the highly conducting planes. For ~-(ET)2Cu(NCS)2 a value of 8T~/cgp~. ~ - 4 . 8 K / k b a r [178] and for ~-(ET)2Cu[N(CN)2]Br (T~ ~ 11 K) OT¢/Op~.

_ ) 5ll) 5(3) C(5) ~t~"~CllOA) C(9B} Fig. 13. ET molecule conformation taken in a charge transfer complex. Hydrogen atoms are not shown for clarity. The terminal ethylene groups C(9) and C(10) can have two different positions (A) and (B). From [125] A large variety of other 2D superconducting salts with different organic constituents have been synthesized. Building blocks are for example DMET, M D T - T T F , B E D O - T T F or also the acceptor molecule M(dmit)2 with M = Ni, Pd, or Pt. These latter salts, however, will not be discussed in general, but rather when measurements of their FS will be presented.

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