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

Hong, Tao; Schmidt, K. P.; Coester, K.; Awwadi, F. F.; Turnbull, M. M.; Qiu, Y.; Rodriguez-Rivera, J. A.; Zhu, M.; Ke, X.; Aoyama, C. P.; Takano, Y.; Cao, Huibo; Tian, Wei; Ma, Jie; Custelcean, Radu; Zhou, H. D.; Matsuda, Masaaki

doi:10.1103/PhysRevB.89.174432

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

Journal Article · Fri May 30 00:00:00 EDT 2014 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.89.174432· OSTI ID:1265300

Hong, Tao ^[1]; Schmidt, K. P. ^[2]; Coester, K. ^[2]; Awwadi, F. F. ^[3]; Turnbull, M. M. ^[4]; Qiu, Y. ^[5]; Rodriguez-Rivera, J. A. ^[5]; Zhu, M. ^[6]; Ke, X. ^[6]; Aoyama, C. P. ^[7]; Takano, Y. ^[7]; Cao, Huibo ^[1]; Tian, Wei ^[1]; Ma, Jie ^[1]; Custelcean, Radu ^[1]; Zhou, H. D. ^[8]; Matsuda, Masaaki ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Technische Universitat Dortmund, Dortmund (Germany)
The University of Jordan, Amman (Jordan)
Clark Univ., Worcester, MA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Michigan State Univ., East Lansing, MI (United States)
Univ. of Florida, Gainesville, FL (United States)
Univ. of Tennessee, Knoxville, TN (United States)

In this article, 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 λ=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 Néel-ordered phase without the assistance of a magnetic field.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1265300

Journal Information:: Physical Review B, Vol. 89, Issue 17; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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