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

Abstract

The macroscopic magnetic properties and microscopic magnetic structure of Rb2Mn3(MoO4)3(OH)2 (space group Pnma) are investigated by magnetization, heat capacity, and single-crystal neutron diffraction measurements. The compound's crystal structure contains bond-alternating [Mn3O11]∞ 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′ma(0b0)00s 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 themore » 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.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [2];  [3]; ORCiD logo [1]
  1. ORNL
  2. Clemson University
  3. Dept. of Chemistry, Clemson University, Clemson SC
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1606870
Alternate Identifier(s):
OSTI ID: 1601701
Grant/Contract Number:  
[AC05-00OR22725; FG02-13ER41967]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
[ Journal Volume: 101; Journal Issue: 6]
Country of Publication:
United States
Language:
English

Citation Formats

Liu, Yaohua, Sanjeewa, Liurukara D., Garlea, Vasile O., Pellizzeri, T. M. Smith, Kolis, Joseph W., and Sefat, Athena Safa. Complex magnetic order in the decorated spin-chain system Rb2Mn3(MoO4)3(OH)2. United States: N. p., 2020. Web. doi:10.1103/PhysRevB.101.064423.
Liu, Yaohua, Sanjeewa, Liurukara D., Garlea, Vasile O., Pellizzeri, T. M. Smith, Kolis, Joseph W., & Sefat, Athena Safa. Complex magnetic order in the decorated spin-chain system Rb2Mn3(MoO4)3(OH)2. United States. doi:10.1103/PhysRevB.101.064423.
Liu, Yaohua, Sanjeewa, Liurukara D., Garlea, Vasile O., Pellizzeri, T. M. Smith, Kolis, Joseph W., and Sefat, Athena Safa. Sat . "Complex magnetic order in the decorated spin-chain system Rb2Mn3(MoO4)3(OH)2". United States. doi:10.1103/PhysRevB.101.064423.
@article{osti_1606870,
title = {Complex magnetic order in the decorated spin-chain system Rb2Mn3(MoO4)3(OH)2},
author = {Liu, Yaohua and Sanjeewa, Liurukara D. and Garlea, Vasile O. and Pellizzeri, T. M. Smith and Kolis, Joseph W. and Sefat, Athena Safa},
abstractNote = {The macroscopic magnetic properties and microscopic magnetic structure of Rb2Mn3(MoO4)3(OH)2 (space group Pnma) are investigated by magnetization, heat capacity, and single-crystal neutron diffraction measurements. The compound's crystal structure contains bond-alternating [Mn3O11]∞ 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′ma(0b0)00s 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.},
doi = {10.1103/PhysRevB.101.064423},
journal = {Physical Review B},
number = [6],
volume = [101],
place = {United States},
year = {2020},
month = {2}
}

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