Large exchange bias and low-temperature glassy state in the frustrated triangular-lattice antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>Ba</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi>NiIr</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mn>9</mml:mn></mml:msub></mml:math>

Gondh, Shobha; Patidar, Manju Mishra; Kumar, Kranti; Saravanan, M. P.; Ganesan, V.; Pramanik, A. K.

doi:10.1103/physrevb.104.014401

Cited by 14 publications

(18 citation statements)

References 50 publications

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“…Whereas no traces of ferromagnetism are observed in 1 , a similar scenario may be possible if the ferrimagnetism of individual honeycomb layers is taken into account (see below). Another interesting observation is that the M ( H ) curve measured at 2 K, below T N , shows a small offset from zero (Figure ) and indicates an exchange bias effect. , Exchange bias has been observed in mixed oxides that combine weakly and strongly anisotropic magnetic ions. , A similar scenario may be envisaged in our case because Fe 3+ ( d 5 ) with the quenched orbital moment is isotropic, whereas Fe 2+ ( d 6 ) with the unquenched orbital moment should be anisotropic. Therefore, two magnetic ions with very different anisotropies are simultaneously present in 1 .…”

Section: Resultssupporting

confidence: 70%

“…21,48 Exchange bias has been observed in mixed oxides that combine weakly and strongly anisotropic magnetic ions. 49,50 A similar scenario may be envisaged in our case because Fe 3+ (d 5 ) with the quenched orbital moment is isotropic, whereas Fe 2+ (d 6 ) with the unquenched orbital moment should be anisotropic. Therefore, two magnetic ions with very different anisotropies are simultaneously present in 1.…”

Section: = =supporting

confidence: 71%

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(CN₃H₆)[Fe^IIFe^III(SO₄)₃(H₂O)₃]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

Ginga,

Siidra,

Tsirlin

et al. 2023

Inorg. Chem.

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A new guanidinium-templated hydrated iron sulfate, [CN 3 H 6 ][Fe II Fe III (SO 4 ) 3 (H 2 O) 3 ] (1), was prepared from strongly acidic aqueous solutions. Its crystal structure is comprised from Fe III O 6 and Fe II O 3 (H 2 O) 3 octahedra linked by sulfate bridges forming a [Fe II Fe II (SO 4 ) 3 (H 2 O) 3 ] − 3D framework with a layer-bylayer ordering of ferric and ferrous cations. The structural topology of the framework is related to the anhydrous rhombohedral mikasaite Fe 2 (SO 4 ) 3 . The removal of part of the sulfate tetrahedra and the partial replacement of the Fe 3+ cations in the [Fe 3+2 (SO 4 ) 3 ] 0 framework by Fe 2+ provide a negative charge and allow the incorporation of the protonated organic species in the voids. The compound 1 has been characterized by single-crystal Xray diffraction, TG and DSC analyses, UV−vis−NIR spectroscopy, magnetic susceptibility, Mossbauer spectroscopy, IR and Raman spectroscopy, and density functional band-structure calculations. The magnetic behavior of 1 shows an interplay of Fe II (S = 2) and Fe III (S = 5/2) sublattices that exhibit different types of antiferromagnetic couplings, one Fe III −Fe III (J 1 ∼ 6.1 K) and two Fe II −Fe III couplings (J 2 ∼ 1 K, J 3 ∼ 5.9 K) within corrugated honeycomb layers. These ferrimagnetic layers are coupled antiparallel to each other, resulting in an overall antiferromagnetic order below T N = 31 K.

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Section: Resultssupporting

confidence: 70%

Section: = =supporting

confidence: 71%

(CN₃H₆)[Fe^IIFe^III(SO₄)₃(H₂O)₃]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

Ginga,

Siidra,

Tsirlin

et al. 2023

Inorg. Chem.

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“…The Ir, on other hand, forms Ir 2 O 9 dimers which are arranged in chain, further it forms triangular lattice with the neighboring Ir atoms (shown in figures 1(b) and 2(a)-(c)). Following our previous results in similar spin-1 based Ba 3 NiIr 2 O 9 [38], the Cu 2+ and Ir 5+ ionic states are expected in present SCIO which both are magnetic. The underlying lattice structure and multiple magnetic ions in combination will result in complex exchange interaction which would give interesting magnetic behavior at low temperature.…”

Section: Introductionsupporting

confidence: 87%

“…However, further theoretical calculations and experimental studies have shown that under nonideal distortion of IrO 6 octahedra, the Ir 5+ contributes to the magnetic moment [32][33][34][35][36][37]. Here, we emphasis the role of spin state as the spin-1 based similar composition Ba 3 NiIr 2 O 9 (Ni 2+ , Ir 5+ ) has shown a SG behavior at low temperature due to complex interactions emanating from both intra-and interlayer exchange paths [38]. In present SCIO, the Sr/Cu forms a disordered layered TL but this layer is magnetically diluted due to presence of nonmagnetic Sr 2+ .…”

Section: Introductionmentioning

confidence: 87%

Coexistence of spin liquid state and magnetic correlations in 3d-5d based triangular-lattice antiferromagnet Sr₃CuIr₂O₉

Gondh,

Kumar,

Saravanan

et al. 2023

J. Phys.: Condens. Matter

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Here, we report detailed lattice structure, magnetization (dc and ac) and speciﬁc heat measurements on a 3d-5d based new triple-perovskite material Sr3CuIr2O9. The Sr/Cu forms a layered structure of triangular-lattice while the Ir forms Ir2O9 dimers which lie in chain as well as simultaneously makes layered triangular-lattice with neighboring atoms. Due to random site-sharing with Sr2+, the Cu2+ (3d9, spin-1/2) forms a diluted magnetic lattice, thus giving a disordered in-plane exchange interaction. Opposed to conventional Jeffmodel, the Ir5+ (5d4, Jeff= 0) is believed to be magnetic here which participates both in-chain and in-plane magnetic interactions. This complex lattice structure driven competing exchange interaction leads the ground state to a gapless quantum-spin-liquid state which coexists with (weak) ferromagnetic spin correlations. While underling the importance of spin state (spin-1/2), we believe that the combined eﬀect of lattice structure, geometric frustration, spin-orbit coupling and spin state has given rise this interesting ground state in this material.

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“…3, the magnetic moment in the field of 0.5 kOe increases with decreasing temperature and exhibits a broad (weak) hump in the particular temperature range of ∼ 22 K to ∼ 5.6 K and centered around T * ∼ 10.4 K. Upon further cooling the magnetization increases continuously from 5.6 K to the lowest measured temperature. For a spin-glass behavior, the magnetization is expected to exhibit a bifurcation between M ZF C and M F C and an anomaly in M ZF C across the glassy temperature, which shifts to lower temperature with increasing the field [11]. Our M(T ) does not show any such bifurcation between M ZF C and M F C in the whole temperature range, which rules out the possibility of a glassy phase.…”

Section: Magnetization Studymentioning

confidence: 64%

Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

Kumar¹,

Köpf²,

A.³

et al. 2022

J. Phys.: Condens. Matter

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Spin-orbit coupling in heavy 5$d$ metal oxides, in particular, iridates have received tremendous interest in recent years due to the realization of exotic electronic and magnetic phases. Here, we report the synthesis, structural, magnetic, thermodynamic, and optical properties of the ternary iridate Pr$_3$IrO$_7$. Single crystals of Pr$_3$IrO$_7$ have been grown by the KF flux method. Structural analysis shows that Pr$_3$IrO$_7$ crystallizes in an orthorhombic phase with $Cmcm$ symmetry. The electron energy loss spectroscopy study indicates that Pr is in a 3+ valence state, which implies a 5+ oxidation state of Ir. Magnetization data measured at high and low magnetic fields do not exhibit any bifurcation between $M_{ZFC}$ and $M_{FC}$, however, a weak hump in $M(T)$ is observed at $T^*$$\sim$10.4~K. The specific heat data reveal two maxima at $\sim$253 K and $\sim$4.8 K. The optical conductivity $\sigma_1(\omega)$ spectrum shows 26 infrared-active phonon modes and reveals an insulating behavior with an optical gap $\Delta_{OP}$ of size $\sim$500~meV. During cooling down, the temperature-dependent reflectivity spectrum reveals seven extra phonon modes below the structural phase transition ($\sim$ 253 K). An anomaly is observed at around $T^*$ in the temperature evolution of infrared-active mode frequencies suggesting the presence of significant spin-phonon coupling in the system.

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Large exchange bias and low-temperature glassy state in the frustrated triangular-lattice antiferromagnetBa3NiIr2O9

Cited by 14 publications

References 50 publications

(CN₃H₆)[Fe^IIFe^III(SO₄)₃(H₂O)₃]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

(CN₃H₆)[Fe^IIFe^III(SO₄)₃(H₂O)₃]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

Coexistence of spin liquid state and magnetic correlations in 3d-5d based triangular-lattice antiferromagnet Sr₃CuIr₂O₉

Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties

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Large exchange bias and low-temperature glassy state in the frustrated triangular-lattice antiferromagnetBa3NiIr2O9

Cited by 14 publications

References 50 publications

(CN3H6)[FeIIFeIII(SO4)3(H2O)3]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

(CN3H6)[FeIIFeIII(SO4)3(H2O)3]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

Coexistence of spin liquid state and magnetic correlations in 3d-5d based triangular-lattice antiferromagnet Sr3CuIr2O9

Fluorite-related iridate Pr3IrO7: crystal growth, structure, magnetism, thermodynamic, and optical properties

Contact Info

Product

Resources

About

(CN₃H₆)[Fe^IIFe^III(SO₄)₃(H₂O)₃]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

(CN₃H₆)[Fe^IIFe^III(SO₄)₃(H₂O)₃]: A Framework Iron Sulfate with a Mixed S = 2 and S = 5/2 Honeycomb Lattice

Coexistence of spin liquid state and magnetic correlations in 3d-5d based triangular-lattice antiferromagnet Sr₃CuIr₂O₉

Fluorite-related iridate Pr₃IrO₇: crystal growth, structure, magnetism, thermodynamic, and optical properties