Spin-ladder behaviour in molecular materials

Abstract

Spin-ladders are quantum magnetic systems at the crossroads between one and two dimensions that have attracted increasing interest during the last decades due to unique properties critically dependent on spin...

A 2D Interactive Spin Ladder System, δ′-(BEDT-TTF)2ClC2H4SO3·H2O

“…10 In this communication, we report a BEDT-TTF-based purely organic semiconducting 2D interactive spin ladder system, δ′-(BEDT-TTF) 2 ClC 2 H 4 SO 3 •H 2 O (1). Typi-cally, spin ladders are isolated from each other by nonmagnetic species, 11 but here the spin ladders interact with each other, hence the term "interactive". Besides the fundamental physical aspects related with spin ladder systems' quantum and topological effects and simple application of switching devices, 11 the interest in spin ladder materials has also been motivated the theoretical prediction that on hole doping they can show superconductivity due to spin mediated hole−hole attraction 12 and pressure-induced superconductivity.…”

“…Typi-cally, spin ladders are isolated from each other by nonmagnetic species, 11 but here the spin ladders interact with each other, hence the term "interactive". Besides the fundamental physical aspects related with spin ladder systems' quantum and topological effects and simple application of switching devices, 11 the interest in spin ladder materials has also been motivated the theoretical prediction that on hole doping they can show superconductivity due to spin mediated hole−hole attraction 12 and pressure-induced superconductivity. 13 Black rhombus-shaped crystals were obtained by the constant-current electrocrystallization method in 18 mL of CH 2 Cl 2 with 10 mg of BEDT-TTF, 44 mg of ClC 2 H 4 SO 3 Na, and 67 mg of 18-crown-6 ether.…”

“…The susceptibility curve cannot be fitted by a Singlet–Triplet model, which we previously reported for another δ′-type salt but can be fitted to a spin ladder model (eq ) with C = 0.375 emu mol –1 K –1 (fixed), a = 1.90 K, and Δ = 100 K [see Note]. ,, …”

“…Several spin ladder systems of organic charge transfer salts have been reported, , in which each ladder is isolated by insulating counterions. Therefore, their interladder interactions are very weak.…”

“…Finally, we roughly estimate j , j 2 , and j 3 using eq , ,, where j ′ = j 3 . For this estimation, we set j 2 = 0.8 j 3 and the j value is assumed to be the same as a 1D Heisenberg chain from 140 to 160 K, j = 120 K. …”