Finite-size effects in the quasi-one-dimensional quantum magnets Sr2CuO3, Sr2Cu0.99M0.01O3 (M = Ni, Zn), and SrCuO2

Article

关键词: HEISENBERG ANTIFERROMAGNETIC CHAINS;    LINEAR-CHAIN;    CUPRATE SR2CUO3;    COMPOUND SRCUO2;    CRYSTAL-GROWTH;    SPIN CHAIN;    THERMODYNAMICS;    SUSCEPTIBILITY;    TEMPERATURE;    IMPURITIES;   

DOI  :  10.1103/PhysRevB.91.224401

来源: SCIE

【 摘 要 】

We studied the finite-size effects on the magnetic behavior of the quasi-one-dimensional spin S = 1/2 Heisenberg antiferromagnets Sr2CuO3, Sr2Cu0.99M0.01O3 (M = Zn and Ni), and SrCuO2. Magnetic susceptibility data were analyzed to estimate the concentration of chain breaks due to extrinsically doped defects and/or due to slight oxygen off-stoichiometry. We show that the susceptibility of Sr2Cu0.99Ni0.01O3 can be described by considering Ni2+ as a scalar defect (S-eff = 0) indicating that the Ni spin is screened. In Sr2Cu0.99Zn0.01O3 susceptibility analysis yields a defect concentration smaller than the nominal value which is in good qualitative agreement with crystal growth experiments. Influence of doping on the low-temperature long-range spin ordered state is studied. In the compound SrCuO2, consisting of zigzag S = 1/2 chains, the influence of spin frustration on the magnetic ordering and the defect concentration determined from the susceptibility data is discussed.

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