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Title: Field tunable magnetic transitions of CsCo2(MoO4)2(OH): a triangular chain structure with a frustrated geometry

Journal Article · · Materials Chemistry Frontiers
DOI: https://doi.org/10.1039/d2qm01272c · OSTI ID:1961941

The sawtooth chain compound CsCo2(MoO4)2(OH) is a complex magnetic system and here, we present a comprehensive series of magnetic and neutron scattering measurements to determine its magnetic phase diagram. The magnetic properties of CsCo2(MoO4)2(OH) exhibit a strong coupling to the crystal lattice and its magnetic ground state can be easily manipulated by applied magnetic fields. There are two unique Co2+ ions, base and vertex, with Jbb and Jbv magnetic exchange. The magnetism is highly anisotropic with the b-axis (chain) along the easy axis and the material orders antiferromagnetically at TN = 5 K. There are two successive metamagnetic transitions, the first at Hc1 = 0.2 kOe into a ferrimagnetic structure, and the other at Hc2 = 20 kOe to a ferromagnetic phase. Heat capacity measurements in various fields support the metamagnetic phase transformations, and the magnetic entropy value is intermediate between S = 3/2 and 1/2 states. The zero field antiferromagnetic phase contains vertex magnetic vectors (Co(1)) aligned parallel to the b-axis, while the base vectors (Co(2)) are canted by 34° and aligned in an opposite direction to the vertex vectors. The spins in parallel adjacent chains align in opposite directions, creating an overall antiferromagnetic structure. Further, at a 3 kOe applied magnetic field, adjacent chains flip by 180° to generate a ferrimagnetic phase. An increase in field gradually induces the Co(1) moment to rotate along the b-axis and align in the same direction with Co(2) generating a ferromagnetic structure. The antiferromagnetic exchange parameters are calculated to be Jbb = 0.028 meV and Jbv = 0.13 meV, while the interchain exchange parameter is considerably weaker at Jch = (0.0047/Nch) meV. Our results demonstrate that the CsCo2(MoO4)2(OH) is a promising candidate to study new physics associated with sawtooth chain magnetism and it encourages further theoretical studies as well as the synthesis of other sawtooth chain structures with different magnetic ions.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; University of Missouri Research Council
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1961941
Alternate ID(s):
OSTI ID: 1957657
Journal Information:
Materials Chemistry Frontiers, Journal Name: Materials Chemistry Frontiers Journal Issue: 6 Vol. 7; ISSN 2052-1537
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (56)

Magnetic structure and susceptibility of CoSe 2 O 5 : An antiferromagnetic chain compound journal July 2010
Symmetry-Based Computational Tools for Magnetic Crystallography journal July 2015
Magnetic Ground State Crossover in a Series of Glaserite Systems with Triangular Magnetic Lattices journal February 2019
Flat-band spin dynamics and phonon anomalies of the saw-tooth spin-chain system Fe 2 O ( SeO 3 ) 2 journal February 2019
Theoretical and experimental developments in quantum spin liquid in geometrically frustrated magnets: a review journal November 2019
Field-induced magnetic transition and spin fluctuations in the quantum spin-liquid candidate CsYbSe 2 journal December 2019
NaCo2(SeO3)2(OH): competing magnetic ground states of a new sawtooth structure with 3d7 Co2+ ions journal January 2022
Coupling of Magnetic and Ferroelectric Hysteresis by a Multicomponent Magnetic Structure in Mn 2 GeO 4 journal February 2012
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides journal September 1976
Quantum spin liquids journal November 2000
Variety of order-by-disorder phases in the asymmetric J 1 − J 2 zigzag ladder: From the delta chain to the J 1 − J 2 chain journal March 2020
Quantum topological excitations: from the sawtooth lattice to the Heisenberg chain journal February 2003
Ferro-Antiferromagnetic Delta-Chain System Studied by High Field Magnetization Measurements journal October 2005
Geometric magnetic frustration in olivines journal July 2000
Single crystal neutron and magnetic measurements of Rb 2 Mn 3 (VO 4 ) 2 CO 3 and K 2 Co 3 (VO 4 ) 2 CO 3 with mixed honeycomb and triangular magnetic lattices journal January 2020
Elementary excitations in the Δ chain journal March 1996
Investigation of a Structural Phase Transition and Magnetic Structure of Na 2 BaFe(VO 4 ) 2 : A Triangular Magnetic Lattice with a Ferromagnetic Ground State journal December 2017
Gapless quantum spin liquid ground state in the two-dimensional spin-1/2 triangular antiferromagnet YbMgGaO4 journal November 2015
Honeycomb-like S = 5/2 Spin–Lattices in Manganese(II) Vanadates journal August 2016
Non-Abelian anyons and topological quantum computation journal September 2008
Crystal Synthesis and Frustrated Magnetism in Triangular Lattice Cs RE Se 2 ( RE = La–Lu): Quantum Spin Liquid Candidates CsCeSe 2 and CsYbSe 2 journal November 2019
Spin liquids in frustrated magnets journal March 2010
Quantum Information and Algorithms for Correlated Quantum Matter journal December 2020
Observation of a Large Magnetic Anisotropy and a Field-Induced Magnetic State in SrCo(VO 4 )(OH): A Structure with a Quasi One-Dimensional Magnetic Chain journal December 2019
Field-tunable toroidal moment in a chiral-lattice magnet journal September 2021
Metamagnetism journal September 1977
Stripe antiferromagnetic ground state of the ideal triangular lattice compound KErSe 2 journal April 2021
Complex magnetic behavior of the sawtooth Fe chains in Rb 2 Fe 2 O(AsO 4 ) 2 journal January 2014
Alkali Transition‐Metal Molybdates: A Stepwise Approach to Geometrically Frustrated Systems journal November 2019
Anomalous Magnetic Properties Near the Spin-Flop Bicritical Point in Mn 2 A S 4 ( A = Si and Ge) journal November 2005
Quantum solitons in the sawtooth lattice journal March 1996
Frustrated Magnetism in Triangular Lattice TlYbS2 Crystals Grown via Molten Flux journal February 2020
Paramagnetic and Optical Spectra of Divalent Cobalt in Cubic Crystalline Fields journal January 1958
Synthesis and neutron powder diffraction structural analysis of oxidized delafossite YCuO2.5 journal May 2006
Magnetic phase diagram of the olivine-type Mn 2 GeO 4 single crystal estimated from magnetic, resonance and thermodynamic properties journal March 2013
Ground state phase diagrams of an anisotropic spin-12 Δ-chain with ferro- and antiferromagnetic interactions journal May 2005
The magnetic order of a manganese vanadate system with two-dimensional striped triangular lattice journal October 2018
Antiferromagnetic sawtooth chain with Heisenberg and Ising bonds journal January 2009
The Fine Structure of YCuO2+x Delafossite Determined by Synchrotron Powder Diffraction and Electron Microscopy journal February 2001
The 2021 quantum materials roadmap journal October 2020
Synthesis and magnetic properties of new tellurate compounds Na 4 MTeO 6 (M = Co and Ni) with a ferromagnetic spin-chain structure journal January 2017
Magnetic Coupling through the Carbon Skeleton of Malonate in Two Polymorphs of {[Cu(bpy)(H2O)][Cu(bpy)(mal)(H2O)]}(ClO4)2 (H2mal = Malonic Acid; bpy = 2,2‘-Bipyridine) journal August 2000
Complex magnetic order in the decorated spin-chain system Rb 2 Mn 3 ( MoO 4 ) 3 ( OH ) 2 journal February 2020
Quantum spin liquids: a review journal November 2016
Transport in Sawtooth photonic lattices journal January 2016
Crystal-field Hamiltonian and anisotropy in KErSe 2 and CsErSe 2 journal April 2020
The high-resolution powder diffractometer at the high flux isotope reactor journal March 2010
Quantum spin liquid states journal April 2017
Competing magnetic ground states and their coupling to the crystal lattice in CuFe2Ge2 journal October 2016
Magnetic characterization of the sawtooth-lattice olivines Zn L 2 S 4 ( L = Er , Tm , Yb ) journal January 2006
Experimental Realization of a Spin- 1 / 2 Triangular-Lattice Heisenberg Antiferromagnet journal January 2012
CoV 2 O 6 Single Crystals Grown in a Closed Crucible: Unusual Magnetic Behaviors with Large Anisotropy and 1 / 3 Magnetization Plateau journal June 2009
Magnetic properties of six-coordinated high-spin cobalt(II) complexes: Theoretical background and its application journal September 2008
Magnetization Process of Atacamite: A Case of Weakly Coupled S=1/2 Sawtooth Chains journal May 2021
Enhancement of magnetization plateaus in low-dimensional spin systems journal June 2020
Antiferromagnetism and the emergence of frustration in the sawtooth lattice chalcogenide olivines Mn 2 SiS 4 − x Se x ( x = 0 – 4 ) journal May 2019