Nuclear Spin Relaxation in Hole Doped Two-Leg Ladders
arXiv:cond-mat/0004433 · doi:10.1143/JPSJ.69.1610
Abstract
The nuclear spin-lattice relaxation rate () has been measured in the single crystals of hole doped two-leg ladder compounds SrCaCuO and in the undoped parent material LaCaCuO. Comparison of at the Cu and the two distinct oxygen sites revealed that the major spectral weight of low frequency spin fluctuations is located near for most of the temperature and doping ranges investigated. Remarkable difference in the temperature dependence of for the two oxygen sites in the heavily doped =12 sample revealed reduction of singlet correlations between two legs in place of growing antiferromagnetic correlations along the leg direction with increasing temperature. Such behavior is most likely caused by the dissociation of bound hole pairs.
4 pages. to appear in J. Phys. Soc. Jpn. Vol. 69
References in corpus (12)
- Surprises on the Way from 1D to 2D Quantum Magnets: the Novel Ladder Materials
- Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm
- Superconductivity in a Quasi One Dimensional Spin Liquid
- The Spin Dynamics of the Spin Ladder, Dimer Chain Material Sr14Cu24O41
- Properties of lightly doped t-J two-leg ladders
- Absence of spin gap in the superconducting ladder compound Sr_2Ca_{12}Cu_{24}O_{41}
- NMR relaxation in half-integer antiferromagnetic spin chains
- Luttinger liquid behaviour and superconducting correlations in t-J ladders
- Spin dynamics of SrCuO and the Heisenberg ladder
- Nuclear spin relaxation rates in two-leg spin ladders
- Dimensional Crossovers in the Doped Ladder System: Spin Gap, Superconductivity and Interladder Coherent Band Motion
- Staggered-spin contribution to nuclear spin-lattice relaxation in two-leg antiferromagnetic spin-1/2 ladders