Multiple magnetic transitions in the spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math>chain antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>SrCuTe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>

Ahmed, N.; Tsirlin, Alexander A.; Nath, R.

doi:10.1103/physrevb.91.214413

Cited by 46 publications

(90 citation statements)

References 45 publications

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“…The magnetic connections of AsO4 groups is relatively weak compared to PO4 for instance, 18 mainly due to longer As-O distances and emphasize their attractive use as efficient magnetic spacers. 34 The structural differences between the 1D-units themselves, i.e. linear versus zigzag chains, are responsible for different types of spin reversal under an external field, fitting well the intuitive hierarchy of magnetocrystalline anisotropy in the two compounds.…”

Section: Discussionsupporting

confidence: 53%

“…Similar results are obtained by fitting the lattice contribution using a standard polynomial sum Clat(T) = Ʃi=1to 5 Ai(T) i . 34 The magnetic contribution Cmag was obtained by subtracting this Clat to the Cp(T) data. In zero magnetic field, the magnetic entropy Smag, released with the magnetic transition was estimated to about 11.6 J/(mol K) and 4.2 J/(mol K) by integrating Cmag/T for the (1) and (2) respectively.…”

Section: Heat Capacity Measurementsmentioning

confidence: 99%

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Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

et al. 2019

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We have investigated two original hydrated cobalt arsenates based on Co 2+ octahedral edgesharing chains. Their different magnetocrystalline anisotropies induce different types of metamagnetic transition, spin-flop versus spin-flip. In both compounds, a strong local anisotropy (Ising spins) is favored by the spin-orbit coupling present in the CoO6 octahedra while ferromagnetic (FM) exchanges predominate in the chains. Co2(As2O7), 2H2O (1) orders antiferromagnetically below TN = 6.7 K. The magnetic structure is a non-collinear antiferromagnetic spin arrangement along the zigzag chains with DFT calculations imply frustrated chains and weakened anisotropy. A metamagnetic transition suggests a spin-flop process above 0H = 3.2 T. On the contrary, BaCo2As2O8.2H2O (2) linear chains are arranged in disconnected layers, with only inter-chain ferromagnetic exchanges and therefore increasing its magnetocrystalline anisotropy. The magnetic structure is collinear with a magnetic easy axis that allows a spin-flop to a sharp spin-flip transition below TN= 15.1 K and above 0H = 6.2 T.

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Section: Discussionsupporting

confidence: 53%

Section: Heat Capacity Measurementsmentioning

confidence: 99%

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

et al. 2019

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“…The positive θ indicates predominant AFM couplings, which are, however, quite weak. In the low-temperature regime, T ( ) c features a rather sharp peak at 7.5 K. This peak is somewhat asymmetric and thus different from the susceptibility maxima in conventional low-dimensional antiferromagnets, where short-range magnetic order is formed well above the Néel temperature T N [58,59]. While no indications of a magnetic transition are seen in the raw susceptibility data, Fisher's heat capacity…”

Section: Thermodynamic Propertiesmentioning

confidence: 86%

“…The gray dotted curve shows the fitted lattice background C T lat ( ). for a spin-1/2 system is released within the transition anomaly and right above T N , while the rest is spread towards higher temperatures, which is typical for low-dimensional antiferromagnets [59] and corroborates that T N is much lower than the energy scale of the exchange couplings given by, e.g., 18 q  K. A similar value for S mag has been reported for the related mineral brochantite (see also section 6) releasing 7.9 J/(mol K), which is about 34% of the total magnetic entropy, in the vicinity of the magnetic transition [39].…”

Section: Thermodynamic Propertiesmentioning

confidence: 95%

Interplay of magnetic sublattices in langite Cu₄(OH)₆SO₄· 2H₂O

et al. 2016

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Magnetic and crystallographic properties of the mineral langite Cu 4 (OH) 6 SO 2 4 · H 2 O are reported. Thermodynamic measurements combined with a microscopic analysis, based on density-functional bandstructure calculations, identify a quasi-two-dimensional (2D), partially frustrated spin-1/2 lattice resulting in the low Néel temperature of T 5.7 N  K. This spin lattice splits into two parts with predominant ferro-and antiferromagnetic (AFM) exchange couplings, respectively. The former, ferromagnetic (FM) part is prone to the long-range magnetic order and saturates around 12 T, where the magnetization reaches 0.5 B m /Cu. The latter, AFM part features a spin-ladder geometry and should evade long-range magnetic order. This representation is corroborated by the peculiar temperature dependence of the specific heat in the magnetically ordered state. We argue that this separation into ferro-and antiferromagnetic sublattices is generic for quantum magnets in Cu 2+ oxides that combine different flavors of structural chains built of CuO 4 units. To start from reliable structural data, the crystal structure of langite in the 100-280 K temperature range has been determined by single-crystal x-ray diffraction, and the hydrogen positions were refined computationally.chains develop incommensurate spin correlations and helical magnetic order [8,9], although few instances of FM intrachain spin order are known as well [10,11]. The helical spin arrangement observed in simple binary compounds CuCl 2 [12] and CuBr 2 [13] and in more complex materials like linarite PbCu(OH) 2 SO 4 [14], all being frustrated J J 1 2 spin chains, may trigger electric polarization induced by the magnetic order, thus leading to multiferroic behavior [15-18]. Additionally, small interactions beyond the isotropic Heisenberg model lead to an intricate magnetic phase diagram, including multipolar (three-magnon) phases, which has been studied recently [19]. However, the complex interplay of frustration and anisotropy needs further investigations on different systems as, e.g., LiCuVO 4 [20-23]. One may naturally ask what happens when two types of spin chains, those with edge-and corner-sharing geometries, are placed next to each other within one material. Spin systems comprising several magnetic OPEN ACCESS RECEIVED =. A more detailed description of the procedure can be found, e.g., in [31,54]. Alternatively, strong electron correlations are added on top of LDA by the LSDA+U method in a mean-field way and are thus included in the self-consistent procedure. This allows for calculating total exchange constants J J J ij ij ij FM AFM ( ) m = J J J 81

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“…Similar procedure has been adopted in various other compounds to estimate the phonon contribution [29,30]. The solid line in the upper panel of Fig.…”

Section: Heat Capacitymentioning

confidence: 97%

Structural and magnetic properties of spin-1/2 layered ferrimagnet Bi2Cu5B4O14

Arjun

Ramakrishnan

Nath

2016

Journal of Alloys and Compounds

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Multiple magnetic transitions in the spin-12chain antiferromagnetSrCuTe2O6

Cited by 46 publications

References 45 publications

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

Interplay of magnetic sublattices in langite Cu₄(OH)₆SO₄· 2H₂O

Structural and magnetic properties of spin-1/2 layered ferrimagnet Bi2Cu5B4O14

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Multiple magnetic transitions in the spin-12chain antiferromagnetSrCuTe2O6

Cited by 46 publications

References 45 publications

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co2+ Chains

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co2+ Chains

Interplay of magnetic sublattices in langite Cu4(OH)6SO4· 2H2O

Structural and magnetic properties of spin-1/2 layered ferrimagnet Bi2Cu5B4O14

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Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

Metamagnetic Transitions versus Magnetocrystalline Anisotropy in Two Cobalt Arsenates with 1D Co²⁺ Chains

Interplay of magnetic sublattices in langite Cu₄(OH)₆SO₄· 2H₂O