ar X iv : 1 00 9 . 43 58 v 2 [ co nd - m at . s of t ] 2 5 Se p 20 10 Shape anisotropy of polymers in disordered environment

ar X iv : c on d - m at / 0 20 91 97 v 1 [ co nd - m at . s up r - co n ] 9 S ep 2 00 2 Oxygen Phonon Branches

ar X iv : 0 70 7 . 42 37 v 2 [ co nd - m at . s up r - co n ] 2 3 M ar 2 00 8 Fluctuation spectroscopy of granularity in superconducting structures

We suggest to use ‘fluctuation spectroscopy’ as a method to detect granularity in a disordered metal close to a superconducting transition. We show that with lowering temperature T the resistance R(T ) of a system of relatively large grains initially grows due to the fluctuation suppression of the one-electron tunneling but decreases with further lowering T due to the coherent charge transfer o...

ar X iv : 0 90 9 . 33 58 v 1 [ co nd - m at . s up r - co n ] 1 8 Se p 20 09 Possible Microscopic Doping Mechanism in Tl - 2201

X-ray absorption spectroscopy on oxygen-annealed, self-flux-grown single crystals of Tl2Ba2CuO6+δ suggests a microscopic doping mechanism whereby interstitial oxygens are attracted to copper substituted on the thallium site, contributing holes to both the planes and to these coppers, and typically promoting only one hole to the plane rather than two. These copper substituents would provide an i...

ar X iv : 0 80 1 . 14 20 v 1 [ co nd - m at . s ta t - m ec h ] 9 J an 2 00 8 Order parameters in the Verwey phase transition

The Verwey phase transition in magnetite is analyzed on the basis of the Landau theory. The free energy functional is expanded in a series of components belonging to the primary and secondary order parameters. A low-temperature phase with the monoclinic P2/c symmetry is a result of condensation of two order parameters X3 and ∆5. The temperature dependence of the shear elastic constant C44 is de...

ar X iv : 0 70 7 . 43 78 v 1 [ co nd - m at . m es - h al l ] 3 0 Ju l 2 00 7 Anderson Transitions

The physics of Anderson transitions between localized and metallic phases in disordered systems is reviewed. The term “Anderson transition” is understood in a broad sense, including both metalinsulator transitions and quantum-Hall-type transitions between phases with localized states. The emphasis is put on recent developments, which include: multifractality of critical wave functions, critical...