Interchain impurity substitution effects on the magnetoelastic coupling in CuGeO3

Size-controlled synthesis and magnetic properties of copper germanate nanorods. Observation of size-induced quenching of the spin-Peierls transition

“…15 This system shows the SP transition with a 14 K transition temperature below which strong spin-lattice coupling leads to dimerisation along the c axis and a singlet ground state. 12,13,[15][16][17][18][19][20][21][22][23][24] A great deal of experimental results strongly support the fact that bulk CuGeO 3 undergoes a true SP transition. [15][16][17][18][19][20][21][22][23][24] Over the past two decades, there has been strong interest in the fabrication of one-dimensional (1-D) nanoscaled materials such as nanorods, nanowires, nanotubes, and nanobelts for their interesting physical and chemical properties.…”

“…12,13,[15][16][17][18][19][20][21][22][23][24] A great deal of experimental results strongly support the fact that bulk CuGeO 3 undergoes a true SP transition. [15][16][17][18][19][20][21][22][23][24] Over the past two decades, there has been strong interest in the fabrication of one-dimensional (1-D) nanoscaled materials such as nanorods, nanowires, nanotubes, and nanobelts for their interesting physical and chemical properties. 25 It is generally accepted that a 1-D nanostructure provides a good system to investigate the dependence of dimensionality and size reduction (or quantum confinement) on physical properties.…”

“…8c with previous work on single crystalline CuGeO 3 . [15][16][17][18][19][20][21][22][23][24] The nanoscale samples A-E are different. In the longer nanorods D and E, the susceptibility displays a weak cusp slightly below 14 K which rises again below 12 K (Fig.…”

“…Examining the constraints on the magnetic system, we see that long range pairing is required to form the spin singlet ground state. 16 When the particle size is reduced to a certain length as in nanorods A, B and C, spin-lattice interactions may be weakened or blocked 10,11 simply because the system is unable to stabilize the long range ordered state. In other words, if the magnetic structure of A, B and C is significantly different from that in longer D, E, and the bulk F, coupling may not be strong enough to drive the SP transition.…”