ESR studies on the ground state properties of S = 1 antiferromagnetic chain systems
نویسنده
چکیده
We performed electron spin resonance (ESR) measurements on two kinds of nickel chain compounds doped with nonmagnetic Zn2+ ions, Ni(333-tet)( -NO2)(ClO4) (333-tet=bis-(3-aminopropyl)-1,3-propanediamine) abbreviated as NTENP and Ni(1,3-pn)2( -NO2)(ClO4) (1,3-pn=1,3-propanediamine) abbreviated as NINO which are regarded as a spin (S) one Heisenberg antiferromagnetic bond alternating chain and a uniform chain, respectively. We observed ESR signals arising from an S = 1 state for the former and those from S =1/2 spins for the latter, which is consistent with the pictures expected from the ground states in the singlet-dimer and the Haldane phases.
منابع مشابه
ESR studies of (CH3)2CHNH3CuCl3: Ferromagnetic- dominant alternating Heisenberg chains with ferromagnetic and antiferromagnetic interactions
Ferromagnetic and antiferromagnetic (F-AF) alternating Heisenberg chains with S = 1/2 can be regarded as Haldane systems when the ferromagnetic exchange interaction is much stronger than the antiferromagnetic one. That is, an energy gap between the singlet ground state and the triplet excited state is expected at T = 0K. In such a system, spins behave as 1/2 at high T where no short-range order...
متن کاملAntiferromagnetic Insulating Ground State of Molecular -d System -(BETS)2FeCl4 (BETS = Bis(ethylenedithio)tetraselenafulvalene): A Theoretical and Experimental Review
The π-d molecular conductor λ-(BETS)2FeCl4, where BETS is bis(ethylenedithio) tetraselenafulvalene, has attracted considerable interest for the discovery of its field induced superconducting state. A mystery of this system is its antiferromagnetic insulating ground state. The point still under strong debate is whether the d spins in Fe3+ are ordered or not. Here, we review experimental and theo...
متن کاملEvidence for the singlet-dimer ground state in an S = 1 antiferromagnetic bond alternating chain.
Susceptibility, ESR, and magnetization measurements have been performed on single crystals of an S = 1 bond alternating chain compound: [Ni(333-tet) (mu-NO2)] (ClO4) (333-tet = N,N'-bis(3-aminopropyl)propane-1,3-diamine) and the compound doped with a small amount of Zn. We observed an anomalous angular dependence in the Zn-doped sample. These results are well explained by the model based on the...
متن کاملLocal magnetic structure due to inhomogeneity of interaction in S = 1 / 2 antiferromagnetic chain
We study the magnetic properties of S = 1/2 antiferromagnetic Heisenberg chains with inhomogeneity of interaction. Using a quantum Monte Carlo method and an exact diagonalization method, we study bond-impurity effect in the uniform S = 1/2 chain and also in the bond-alternating chain. Here ‘bond impurity’ means a bond with strength different from those in the bulk or a defect in the alternating...
متن کاملAbstract Submitted for the MAR13 Meeting of The American Physical Society Spin moment distributions in Cr-based antiferromagnetic rings
Submitted for the MAR13 Meeting of The American Physical Society Spin moment distributions in Cr-based antiferromagnetic rings Cr7M (M=Ni and Cd) studied by 53Cr NMR YUJI FURUKAWA, Department of Physics and Astronomy, Iowa State University, CECILIA CASADEI, LORENZO BORDONALI, FERDIANDO BORSA, Department of Physics “A.Volta”, Università degli studi di Pavia, GRIHORE TIMCO, RICHARD WINPENNY, Depa...
متن کامل