Complex magnetic order in the decorated spin-chain system Rb2Mn3(MoO4)3(OH)2

Liu, Yaohua; Sanjeewa, Liurukara D.; Garlea, V. Ovidiu; Smith Pellizzeri, Tiffany M.; Kolis, Joseph W.; Sefat, Athena S.

doi:10.1103/PhysRevB.101.064423

Title: Complex magnetic order in the decorated spin-chain system ${Rb}_{2} {Mn}_{3} {({MoO}_{4})}_{3} {(OH)}_{2}$

Journal Article · Mon Feb 24 00:00:00 EST 2020 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.101.064423· OSTI ID:1606870

^[1];

^[1]; Smith Pellizzeri, Tiffany M. ^[2]; Kolis, Joseph W. ^[3];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Clemson Univ., SC (United States); Eastern Illinois Univ., Charleston, IL (United States)
Clemson Univ., SC (United States)

The macroscopic magnetic properties and microscopic magnetic structure of Rb₂Mn₃(MoO₄)₃ (OH)₂ (space group Pn ma) are investigated by magnetization, heat capacity, and single-crystal neutron diffraction measurements. The compound's crystal structure contains bond-alternating [Mn₃ O₁₁] ^∞ chains along the b axis, formed by isosceles triangles of Mn ions occupying two crystallographically nonequivalent sites (the Mn1 site on the base and Mn2 site on the vertex). These chains are only weakly linked to each other by nonmagnetic oxyanions. Both superconducting quantum interference device magnetometry and neutron diffraction experiments show two successive magnetic transitions as a function of temperature. On cooling, it transitions from a paramagnetic phase into an incommensurate phase below 4.5 K with a magnetic wave vector near k₁ = ( 0 , 0.46 , 0 ). An additional commensurate antiferromagnetically ordered component arises with k₂ = ( 0, 0, 0), forming a complex magnetic structure below 3.5 K with two different propagation vectors of different stars. On further cooling, the incommensurate wave vector undergoes a lock-in transition below 2.3 K. The experimental results suggest that the magnetic superspace group is Pnma. 1' (0b0) s0ss for the single- k incommensurate phase and is Pn' m a ( 0 b 0 ) 00 s for the two- k magnetic phase. We propose a simplified magnetic structure model taking into account the major ordered contributions, where the commensurate k₂ defines the ordering of the c-axis component of the Mn1 magnetic moment, while the incommensurate k₁ describes the ordering of the ab -plane components of both Mn1 and Mn2 moments into elliptical cycloids.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-13ER41967

OSTI ID:: 1606870

Alternate ID(s):: OSTI ID: 1601701

Journal Information:: Physical Review B, Vol. 101, Issue 6; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Title: Complex magnetic order in the decorated spin-chain system ${Rb}_{2} {Mn}_{3} {({MoO}_{4})}_{3} {(OH)}_{2}$