Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study

S. M. Yusuf; A. K. Bera; C. Ritter; Yoshihiro Tsujimoto; Yoshitami Ajiro; Hiroshi Kageyama; J. Paul Attfield

doi:10.1103/PhysRevB.84.064407

Magnetic correlation in the square-lattice spin system (CuBr)Sr₂Nb₃O₁₀: A neutron diffraction study

S. M. Yusuf, A. K. Bera, C. Ritter, Yoshihiro Tsujimoto, Yoshitami Ajiro, Hiroshi Kageyama, J. Paul Attfield

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Abstract

Magnetic correlation in the quantum S=1/2 square-lattice system (CuBr)Sr₂Nb₃O₁₀ has been studied by neutron diffraction. A novel commensurate in-plane, helical antiferromagnetic (AFM) ordering, characterized by the propagation vector k = (0 3/8 1/2), has been confirmed from the appearance of magnetic Bragg peaks below T_N∼ 7.5 K. The ordered moment at 2 K is found to be 0.79(7) μ_B/Cu²⁺-ion. The observed helical AFM structure differs from the ground state predicted theoretically from the J₁-J₂ model as well as from experimentally reported states for other quantum S=1/2 square-lattice systems. However, the observed helical magnetic structure can be described in a J₁-J₂-J₃ model. Under a 4.5 T magnetic field, the spin-order changes drastically and is characterized by the propagation vector k₁ = (0 1/3 0.446) and a probable k₂ = (0 0 0) vector.

Original language	English
Article number	064407
Number of pages	6
Journal	Physical review B
Volume	84
Issue number	6
Early online date	18 Aug 2011
DOIs	https://doi.org/10.1103/PhysRevB.84.064407
Publication status	Published - 2011

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http://prb.aps.org/abstract/PRB/v84/i6/e064407

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@article{7eac1ad75ad743fca137193d462bccdc,

title = "Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study",

abstract = "Magnetic correlation in the quantum S=1/2 square-lattice system (CuBr)Sr2Nb3O10 has been studied by neutron diffraction. A novel commensurate in-plane, helical antiferromagnetic (AFM) ordering, characterized by the propagation vector k = (0 3/8 1/2), has been confirmed from the appearance of magnetic Bragg peaks below TN ∼ 7.5 K. The ordered moment at 2 K is found to be 0.79(7) μB/Cu2+-ion. The observed helical AFM structure differs from the ground state predicted theoretically from the J1-J2 model as well as from experimentally reported states for other quantum S=1/2 square-lattice systems. However, the observed helical magnetic structure can be described in a J1-J2-J3 model. Under a 4.5 T magnetic field, the spin-order changes drastically and is characterized by the propagation vector k1 = (0 1/3 0.446) and a probable k2 = (0 0 0) vector.",

author = "Yusuf, {S. M.} and Bera, {A. K.} and C. Ritter and Yoshihiro Tsujimoto and Yoshitami Ajiro and Hiroshi Kageyama and Attfield, {J. Paul}",

year = "2011",

doi = "10.1103/PhysRevB.84.064407",

language = "English",

volume = "84",

journal = "Physical review B",

issn = "1098-0121",

publisher = "American Physical Society",

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T1 - Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study

AU - Yusuf, S. M.

AU - Bera, A. K.

AU - Ritter, C.

AU - Tsujimoto, Yoshihiro

AU - Ajiro, Yoshitami

AU - Kageyama, Hiroshi

AU - Attfield, J. Paul

PY - 2011

Y1 - 2011

N2 - Magnetic correlation in the quantum S=1/2 square-lattice system (CuBr)Sr2Nb3O10 has been studied by neutron diffraction. A novel commensurate in-plane, helical antiferromagnetic (AFM) ordering, characterized by the propagation vector k = (0 3/8 1/2), has been confirmed from the appearance of magnetic Bragg peaks below TN ∼ 7.5 K. The ordered moment at 2 K is found to be 0.79(7) μB/Cu2+-ion. The observed helical AFM structure differs from the ground state predicted theoretically from the J1-J2 model as well as from experimentally reported states for other quantum S=1/2 square-lattice systems. However, the observed helical magnetic structure can be described in a J1-J2-J3 model. Under a 4.5 T magnetic field, the spin-order changes drastically and is characterized by the propagation vector k1 = (0 1/3 0.446) and a probable k2 = (0 0 0) vector.

AB - Magnetic correlation in the quantum S=1/2 square-lattice system (CuBr)Sr2Nb3O10 has been studied by neutron diffraction. A novel commensurate in-plane, helical antiferromagnetic (AFM) ordering, characterized by the propagation vector k = (0 3/8 1/2), has been confirmed from the appearance of magnetic Bragg peaks below TN ∼ 7.5 K. The ordered moment at 2 K is found to be 0.79(7) μB/Cu2+-ion. The observed helical AFM structure differs from the ground state predicted theoretically from the J1-J2 model as well as from experimentally reported states for other quantum S=1/2 square-lattice systems. However, the observed helical magnetic structure can be described in a J1-J2-J3 model. Under a 4.5 T magnetic field, the spin-order changes drastically and is characterized by the propagation vector k1 = (0 1/3 0.446) and a probable k2 = (0 0 0) vector.

U2 - 10.1103/PhysRevB.84.064407

DO - 10.1103/PhysRevB.84.064407

M3 - Article

VL - 84

JO - Physical review B

JF - Physical review B

SN - 1098-0121

IS - 6

M1 - 064407

ER -

Magnetic correlation in the square-lattice spin system (CuBr)Sr2Nb3O10: A neutron diffraction study

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Magnetic correlation in the square-lattice spin system (CuBr)Sr₂Nb₃O₁₀: A neutron diffraction study