2009/12/31 by L. K. Alexander, Julien Bobroff, J. Bobroff +6
Materials Science · Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Curie temperature #Ferromagnetism #Geometry #Impurity #Line (geometry) #Magnetic and transport properties of perovskites and related materials #Magnetic moment #Magnetic susceptibility #Materials science #Mathematics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Thermodynamics #cond-mat.stat-mech #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.81.054438
published as Phys. Rev. B 81, 054438 (2010) · 11 pages, 16 figures
openalex publication_date 2010/02/24 · arxiv created 2010/10/21 · arxiv updated 2010/10/25 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present a 31P NMR study of the coupled spin (1)/(2) ladder compound BiCu2PO6. In the pure material, intrinsic susceptibility, and dynamics show a spin gap of about \ensuremathΔ\ensuremath≈35--40 K. Substitution of nonmagnetic Zn or magnetic Ni impurity at Cu site induces a staggered magnetization which results in a broadening of the 31P NMR line while susceptibility far from the defects is unaffected. The effect of Ni on the NMR line broadening is twice that of Zn, which is consistent with quantum Monte Carlo calculations assuming that Ni couples ferromagnetically to its adjacent Cu. The induced moment follows a 1/T temperature dependence due to the Curie-type development of the moment amplitude while its extension saturates and does not depend on impurity content or nature. This allow us to verify the generically expected scenario for impurity doping and to extend it to magnetic impurity case: in an antiferromagnetically correlated low-dimensional spin system with antiferromagnetic correlations, any type of impurity induces a staggered moment at low temperature, whose extension is not linked to the impurity nature but to the intrinsic physics at play in the undoped pure system, from one-dimensional to two-dimensional systems.