Magnetic light scattering in low-dimensional quantum spin systems

Lemmens, P.; Güntherodt, G.; Gros, Claudius

doi:10.1016/s0370-1573(02)00321-6

Cited by 231 publications

(262 citation statements)

References 417 publications

Supporting

Mentioning

247

Contrasting

Unclassified

Order By: Relevance

“…We keep the same abbreviation SAF for the latter. 7 This type of coupling is allowed by the symmetry of the original NaV 2 O 5 lattice [6]. Numerical estimates of ε from a microscopic Hamiltonian are given in [25].…”

Section: A Hamiltonianmentioning

confidence: 99%

Ordering in two-dimensional Ising models with competing interactions

Chitov

Gros

2005

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

We study the 2D Ising model on a square lattice with additional non-equal diagonal next-nearest neighbor interactions. The cases of classical and quantum (transverse) models are considered. Possible phases and their locations in the space of three Ising couplings are analyzed. In particular, incommensurate phases occurring only at non-equal diagonal couplings, are predicted. We also analyze a spin-pseudospin model comprised of the quantum Ising model coupled to XY spin chains in a particular region of interactions, corresponding to the Ising sector's super-antiferromagnetic (SAF) ground state. The spin-SAF transition in the coupled Ising-XY model into a phase with co-existent SAF Ising (pseudospin) long-range order and a spin gap is considered. Along with destruction of the quantum critical point of the Ising sector, the phase digram of the Ising-XY model can also demonstrate a re-entrance of the spin-SAF phase. A detailed study of the latter is presented. The mechanism of the re-entrance, due to interplay of interactions in the coupled model, and the conditions of its appearance are established. Applications of the spin-SAF theory for the transition in the quarter-filled ladder compound NaV2O5 are discussed.

show abstract

Section: A Hamiltonianmentioning

confidence: 99%

Ordering in two-dimensional Ising models with competing interactions

Chitov

Gros

2005

Low Temperature Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…1 Model compounds especially with a gap in the excitation spectrum are extensively pursued. Spin gap is found in many low-dimensional quantum spin systems.…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic properties of spin-1/2 dimer compound Cu₂(IPA)₂(DMF)(H₂O) with a large spin gap

Thamban

Arjun

Padmanabhan

et al. 2017

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

We present the synthesis and a detailed investigation of structural and magnetic properties of metal-organic compound Cu2(IPA)2(DMF)(H2O) by means of x-ray diffraction, magnetization, and heat capacity measurements. Single crystals of the title compound were synthesized by judicious selection of organic ligand and employing a selective hydrothermal reaction route. It crystallizes in an orthorhombic structure with space group Cmca. The structural analysis revealed that two Cu 2+ ions are held together by the organic component (-O-C-O-) in a square paddle-wheel to form spin dimers which are aligned perpendicular to each other and are further coupled through organic ligands (isophthalic acid) forming two-dimensional layers. Temperature dependent magnetic susceptibility χ(T ) could be described well using spin-1/2 dimer model. The spin susceptibility χspin(T ) shows an exponential decrease in the low temperature region, below the broad maximum, confirming the singlet ground state with a large spin gap of ∆/kB 409 K. The heat capacity Cp measured as a function of temperature also confirms the absence of magnetic long-range-order down to 2 K.

show abstract

“…1 Such systems have a number of experimental realizations and exhibit a variety of phenomena, the origin of which has been attributed to quantum effects and low dimensions. In general, spin-Peierls chains, uniform or alternating-exchange antiferromagnetic spin chains, and a variety of spin ladders have been investigated.…”

Section: Introductionmentioning

confidence: 99%

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

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.

show abstract

Magnetic light scattering in low-dimensional quantum spin systems

Cited by 231 publications

References 417 publications

Ordering in two-dimensional Ising models with competing interactions

Ordering in two-dimensional Ising models with competing interactions

Structural and magnetic properties of spin-1/2 dimer compound Cu₂(IPA)₂(DMF)(H₂O) with a large spin gap

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

Contact Info

Product

Resources

About

Magnetic light scattering in low-dimensional quantum spin systems

Cited by 231 publications

References 417 publications

Ordering in two-dimensional Ising models with competing interactions

Ordering in two-dimensional Ising models with competing interactions

Structural and magnetic properties of spin-1/2 dimer compound Cu2(IPA)2(DMF)(H2O) with a large spin gap

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

Contact Info

Product

Resources

About

Structural and magnetic properties of spin-1/2 dimer compound Cu₂(IPA)₂(DMF)(H₂O) with a large spin gap

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