Magnetic Ordering induced by Interladder Coupling in the Spin-1/2 Heisenberg Two-leg Ladder Antiferromagnet C9H18N2CuBr4

Published

May 30, 2014

Author(s)

Tao Hong, K. P. Schmidt, K. Coester, F.F. Awwadi, M.M. Turnbull, Yiming Qiu, Jose Rodriguez Rivera, M. Zhu, X. Ke, C.P. Aoyama, Y. Takano, Huibo Cao, W. Tian, J. Ma, R. Custelcean, H.D. Zhou, M. Matsuda

Abstract

We present specific-heat and neutron-scattering results for the S=1/2 quantum antiferromagnet (dimethylammonium)(3,5-dimethylpyridinim)CuBr₄. The material orders magnetically at Τ_N=1.99(2)K, and magnetic excitations are accompanied by an energy gap of 0.30(2) meV due to the spin anisotropy. They system is best described as coupled two-leg spin-1/2 ladders with the leg exchange J_leg=0.60(2) meV, rung exchange J_rung=0.64(9) meV, interladder exchange J_int=0.19(2) MeV, and an interaction-anisotropy parameter λ= .93(2), according to inelastic neutron-scattering measurements, In contrast to most spin ladders reported to date, the material is a rare example in which the interladder coupling is sufficiently strong to drive it to a Neel-ordered phase without an assistance of a magnetic field.

Citation

Physical Review B

Volume

89

Issue

17

Pub Type

Journals

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Keywords

two-leg ladder, quantum antiferromagnet, neutron scattering

Citation

Hong, T. , Schmidt, K. , Coester, K. , Awwadi, F. , Turnbull, M. , Qiu, Y. , Rodriguez Rivera, J. , Zhu, M. , Ke, X. , Aoyama, C. , Takano, Y. , Cao, H. , Tian, W. , Ma, J. , Custelcean, R. , Zhou, H. and Matsuda, M. (2014), Magnetic Ordering induced by Interladder Coupling in the Spin-1/2 Heisenberg Two-leg Ladder Antiferromagnet C₉H₁₈N₂CuBr₄, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915824 (Accessed July 17, 2024)