Magnetic ordering induced by interladder coupling in the spin-1/2 Heisenberg two-leg ladder antiferromagnet C9H18N2CuBr4

Hong T, Schmidt KP, Coester K, Awwadi FF, Turnbull MM, Qiu Y, Rodriguez-Rivera JA, Zhu M, Ke X, Aoyama CP, Takano Y, Cao H, Tian W, Ma J, Custelcean R, Zhou HD, Matsuda M (2014)

Publication Status: Published

Publication Type: Journal article

Publication year: 2014

Journal

Physical Review B American Physical Society

Publisher: AMER PHYSICAL SOC

Book Volume: 89

Journal Issue: 17

DOI: 10.1103/PhysRevB.89.174432

Abstract

We present specific-heat and neutron-scattering results for the S = 1/2 quantum antiferromagnet (dimethylammonium)(3,5-dimethylpyridinium)CuBr4. The material orders magnetically at T-N = 1.99(2) K, and magnetic excitations are accompanied by an energy gap of 0.30(2) meV due to spin anisotropy. The 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 lambda = 0.93(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 very near the critical value required to drive the system to a Neel-ordered phase without the assistance of a magnetic field.

Authors with CRIS profile

Kai Phillip Schmidt Professur für Theoretische Physik

Involved external institutions

National Institute of Standards and Technology (NIST) US United States (USA) (US) Clark University US United States (USA) (US) University of Jordan JO Jordan (JO) Technische Universität Dortmund DE Germany (DE) Oak Ridge National Laboratory US United States (USA) (US) University of Tennessee (UTK) US United States (USA) (US) University of Florida US United States (USA) (US) Michigan State University US United States (USA) (US)

How to cite

APA:

Hong, T., Schmidt, K.P., Coester, K., Awwadi, F.F., Turnbull, M.M., Qiu, Y.,... Matsuda, M. (2014). Magnetic ordering induced by interladder coupling in the spin-1/2 Heisenberg two-leg ladder antiferromagnet C9H18N2CuBr4. Physical Review B, 89(17). https://doi.org/10.1103/PhysRevB.89.174432

MLA:

Hong, Tao, et al. "Magnetic ordering induced by interladder coupling in the spin-1/2 Heisenberg two-leg ladder antiferromagnet C9H18N2CuBr4." Physical Review B 89.17 (2014).

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