Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-11-05
Physics
Condensed Matter
Strongly Correlated Electrons
few corrections made, 15 pages, to be published in European Journal of Physics B
Scientific paper
10.1007/s100510050539
In a magnetic field, spin-ladders undergo two zero-temperature phase transitions at the critical fields Hc1 and Hc2. An experimental review of static and dynamical properties of spin-ladders close to these critical points is presented. The scaling functions, universal to all quantum critical points in one-dimension, are extracted from (a) the thermodynamic quantities (magnetization) and (b) the dynamical functions (NMR relaxation). A simple mapping of strongly coupled spin ladders in a magnetic field on the exactly solvable XXZ model enables to make detailed fits and gives an overall understanding of a broad class of quantum magnets in their gapless phase (between Hc1 and Hc2). In this phase, the low temperature divergence of the NMR relaxation demonstrates its Luttinger liquid nature as well as the novel quantum critical regime at higher temperature. The general behaviour close these quantum critical points can be tied to known models of quantum magnetism.
Berthier Claude
Chaboussant Gregory
Fagot-Revurat Y.
Hanson Merle E.
Horvatic Mladen
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