<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">V</mml:mi><mml:mprescripts /><mml:none /><mml:mn>51</mml:mn></mml:mmultiscripts></mml:math>NMR study of the quasi-one-dimensional alternating chain compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>BaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><

Ghoshray, K.; Pahari, Bholanath; Bandyopadhyay, Bilwadal; Sarkar, Ritabrata; Ghoshray, Amitabha

doi:10.1103/physrevb.71.214401

Cited by 38 publications

(30 citation statements)

References 26 publications

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“…4 The linear fits between 1/T 1 T and χ are found in the temperature ranges 20-150 K and 150-300 K, respectively. Similar linearity has been widely observed in other quasi-1D spin systems [24][25][26][27] , and this fact indicates that χ(Q) is roughly proportional to χ in these systems as expected from Eq. (4).…”

Section: B Spin Dynamics In the Paramagnetic Statesupporting

confidence: 63%

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2O
Ideta
¹
,
Kawasaki
²
,
Kishimoto
³

et al. 2012
Phys. Rev. B
14
1
5
0
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arXiv:1210.0272v1 [cond-mat.str-el] We report on our 51 V-NMR study of static and dynamical magnetic properties in the quasione-dimensional antiferromagnet BaCo2V2O8. Although the NMR spectrum shows well-defined antiferromagnetic (AF) order in the Néel ground state, the AF characteristic from the NMR spectrum is incomplete between 3.5 K and TN = 5.4 K, which could be affected by quantum spin fluctuations. The AF NMR spectrum indicates two V sites experiencing different magnetic field magnitudes, HA1 = 2.1 kOe and HA2 = 3.8 kOe. These internal fields could be explained by accounting for the classical and the pseudo-dipolar fields from Co 2+ spins with a proposed magnetic structure based on the neutron diffraction measurements. In the paramagnetic state, the nuclear spin relaxation is dominated by AF spin fluctuations through the dipolar-type coupling between V and surrounding Co 2+ ions. The linear relation between the nuclear spin-lattice relaxation rate 1/T1T and the magnetic susceptibility χ indicates that the Q component of magnetic susceptibility χ(Q) is roughly proportional to χ, where Q is the AF wave number. A change in slope of 1/T1T with respect to χ around 150 K suggests a change in the AF spin fluctuation spectrum.

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Section: B Spin Dynamics In the Paramagnetic Statesupporting

confidence: 63%

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2O
Ideta
¹
,
Kawasaki
²
,
Kishimoto
³

et al. 2012
Phys. Rev. B
14
1
5
0
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“…On the other hand, Koo and Whangbo, 6 based on extended Hückel tight-binding calculations, determined the dominant exchange path and found an alternation parameter close to ␣ = 0.1. Both the parameters ͑exchange path and ␣͒ are different from those suggested by He et al 4 The exchange path proposed by Koo and Whangbo 6 is, however, supported by a recent 51 V NMR study by Ghoshray et al, 7 suggesting the importance of both the inequivalent vanadium ions to determine the chain topology. In view of these apparent inconsistencies, we decided to take a deeper look at the properties of BaCu 2 V 2 O 8 from both an experimental viewpoint as also via first principles electronic structure calculations.…”

Section: Introductioncontrasting

confidence: 48%

Magnetic properties and electronic structure ofS=1∕2spin gap compoundBaCu2
Salunke
¹
,
Mahajan
²
,
Dasgupta
³

2008
Phys. Rev. B
15
5
21
2
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A detailed experimental as well as theoretical study is carried out to elucidate the origin of the spin gap in the quasi-one-dimensional compound BaCu 2 V 2 O 8 . Our experimental analysis with the aid of careful magnetic susceptibility measurements on powder samples confirms that the magnetic behavior of this compound is best described by an isolated dimer model. We have also employed first principles calculations to study the electronic structure and magnetic properties of this low-dimensional spin gap compound. Using the self-consistent tight-binding linearized muffin-tin orbital ͑LMTO͒ method, and the Nth order LMTO method, we have identified the dominant exchange path by calculating the effective Cu-Cu hopping integrals. Our estimate of the alternation parameter ␣ from the electronic structure calculations is consistent with that estimated from experiment confirming the validity of the isolated dimer model to explain the origin of the spin gap in this system.

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“…1(a)). Previous χ DC [25,[34][35][36], specific heat [25] and 51 V nuclear magnetic resonance [36,37] measurements revealed a non-magnetic ground state with excitations above a gap of size ∆ ≈ 31.0 − 40.5 meV. This implies that the Cu 2+ ions are coupled into dimers by a dominant AFM intradimer interaction (J intra ), resulting in a spin-singlet ground state and gapped triplon excitations.…”

mentioning

confidence: 99%

Magnetic excitations in theS=12antiferromagnetic-ferromagnetic chain compoundBaCu2V2O

et al. 2016

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Unlike most quantum systems which rapidly become incoherent as temperature is raised, strong correlations persist at elevated temperatures in S = 1/2 dimer magnets, as revealed by the unusual asymmetric lineshape of their excitations at finite temperatures. Here we quantitatively explore and parameterize the strongly correlated magnetic excitations at finite temperatures using the high resolution inelastic neutron scattering on the model compound BaCu2V2O8 which we show to be an alternating antiferromagnetic-ferromagnetic spin−1/2 chain. Comparison to state of the art computational techniques shows excellent agreement over a wide temperature range. Our findings hence demonstrate the possibility to quantitatively predict coherent behavior at elevated temperatures in quantum magnets.In the study of unconventional states of matter, quantum magnetic materials with their strong correlations play a crucial role [1][2][3][4][5]. Quantum mechanical coherence and entanglement are intrinsic to these systems, both being relevant for potential applications in quantum devices [6,7]. However, the question arises for their persistence when increasing temperature. Intuitively, one expects temperature to suppress quantum behavior, as typically encountered in the study of quantum criticality [8]. Interestingly, this is not always the case, and in certain systems, e.g. in the presence of disorder, coherent behavior is not simply suppressed by temperature, but rather an interesting interplay develops [9,10], which can lead to counterintuitive behavior such as the increase of conductance through molecules with temperature [11].Another example is the extraordinary coherence of the magnetic excitations at elevated temperatures. This was theoretically predicted for 1-dimensional (1D) gapped quantum dimer antiferromagnets (AFM) by using integrable quantum field theory [12] and was experimentally confirmed on the strongly dimerized spin−1/2 AFM alternating chain compound copper nitrate, which has a spin-singlet ground state and gapped triplet excitations (henceforth referred to as triplons [13]) confined within a narrow band [14]. Here, the triplons interact strongly via the AFM interdimer coupling and also via an effective repulsive interaction due to the hard-core constraint. The resulting strong correlations lead to the experimentally observed asymmetric broadening of the lineshape with temperature [14,15]. So far, such experimental data was compared to exact diagonalization data from small systems and to results from low-temperature expansion around the strongly dimerized limit of Heisenberg spin-1/2 chains [16,17]. Further experimental studies revealed that the strongly correlated behavior at elevated temperatures is not restricted to 1D systems. It was recently observed that the lineshape in the 3-dimensional (3D) coupled-dimer antiferromagnet Sr 3 Cr 2 O 8 also becomes asymmetric and increasingly weighted towards the center of the band as temperature increases [18,19]. So far, no reliable theoretical approaches on the microscopic ...

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V51NMR study of the quasi-one-dimensional alternating chain compoundBaCu2V2<

Cited by 38 publications

References 26 publications

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2O
Ideta
¹
,
Kawasaki
²
,
Kishimoto
³

et al. 2012
Phys. Rev. B
14
1
5
0
View full text Add to dashboard Cite

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2O
Ideta
¹
,
Kawasaki
²
,
Kishimoto
³

et al. 2012
Phys. Rev. B
14
1
5
0
View full text Add to dashboard Cite

Magnetic properties and electronic structure ofS=1∕2spin gap compoundBaCu2
Salunke
¹
,
Mahajan
²
,
Dasgupta
³

2008
Phys. Rev. B
15
5
21
2
View full text Add to dashboard Cite

Magnetic excitations in theS=12antiferromagnetic-ferromagnetic chain compoundBaCu2V2O

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V51NMR study of the quasi-one-dimensional alternating chain compoundBaCu2V2<

Cited by 38 publications

References 26 publications

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2OIdeta1, Kawasaki2, Kishimoto3 et al. 2012Phys. Rev. B14150View full textAdd to dashboardCite

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2OIdeta1, Kawasaki2, Kishimoto3 et al. 2012Phys. Rev. B14150View full textAdd to dashboardCite

Magnetic properties and electronic structure ofS=1∕2spin gap compoundBaCu2Salunke1, Mahajan2, Dasgupta3 2008Phys. Rev. B155212View full textAdd to dashboardCite

Magnetic excitations in theS=12antiferromagnetic-ferromagnetic chain compoundBaCu2V2O

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About

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2O
Ideta
¹
,
Kawasaki
²
,
Kishimoto
³

et al. 2012
Phys. Rev. B
14
1
5
0
View full text Add to dashboard Cite

51V NMR study of antiferromagnetic state and spin dynamics in quasi-one-dimensional BaCo2V2O
Ideta
¹
,
Kawasaki
²
,
Kishimoto
³

et al. 2012
Phys. Rev. B
14
1
5
0
View full text Add to dashboard Cite

Magnetic properties and electronic structure ofS=1∕2spin gap compoundBaCu2
Salunke
¹
,
Mahajan
²
,
Dasgupta
³

2008
Phys. Rev. B
15
5
21
2
View full text Add to dashboard Cite