Frustrated couplings between alternating spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:mrow></mml:math>chains in AgVOAsO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Tsirlin, Alexander A.; Nath, R.; Sichelschmidt, J.; Skourski, Y.; Geibel, C.; Rösner, H.

doi:10.1103/physrevb.83.144412

Cited by 39 publications

(72 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 As reported in Ref. 7, the χ(T ) data show a Curie-like upturn at low temperatures. In contrast, the exponential decrease observed in K(T ) clearly proves that the lowtemperature upturn in χ(T ) is extrinsic in nature.…”

Section: Resultsmentioning

confidence: 53%

“…7. The NMR experiments on 75 As nucleus (nuclear spin I = 3/2 and gyromagnetic ratio γ/2π = 7.291 MHz/T) were carried out using pulsed NMR techniques at a radio frequency (ν) of 49.5 MHz.…”

Section: Methodsmentioning

confidence: 99%

“…7. Though the χ(T ) data show a broad maximum at around 20 K, a hall-mark of low-dimensionality, bulk magnetic susceptibility χ(T ) at low temperatures is dominated by a Curie-like paramagnetic contributions of unknown origin.…”

Section: Introductionmentioning

confidence: 93%

“…Thus, the As site is coupled to four V 4+ ions (two from each chain) belonging to two crossing magnetic chains, see Ref. 7 for further details.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Alternating spin chain compound AgVOAsO4 probed by As75 NMR

Ahmed¹,

Khuntia

Ranjith

et al. 2017

Phys. Rev. B

View full text Add to dashboard Cite

75 As NMR measurements were performed on a polycrystalline sample of spin-1 2 alternating-spinchain Heisenberg antiferromagnet AgVOAsO4. Temperature-dependent NMR shift K(T ), which is a direct measure of the intrinsic spin susceptibility, agrees very well with the spin-1 2 alternatingchain model, justifying the assignment of the spin lattice. From the analysis of K(T ), magnetic exchange parameters were estimated as follows: the leading exchange J/kB 38.4 K, alternation ratio α = J /J 0.68, and spin gap ∆/kB 15 K. The transferred hyperfine coupling between the 75 As nucleus and V 4+ spins obtained by comparing the NMR shift with bulk susceptibility amounts to A hf 3.3 T/µB. Our temperature-dependent spin-lattice relaxation rate 1/T1(T ) also shows an activated behaviour at low temperatures, thus confirming the presence of a spin gap in AgVOAsO4.

show abstract

Section: Resultsmentioning

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

“…Thus, the As site is coupled to four V 4+ ions (two from each chain) belonging to two crossing magnetic chains, see Ref. 7 for further details.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Alternating spin chain compound AgVOAsO4 probed by As75 NMR

Ahmed¹,

Khuntia

Ranjith

et al. 2017

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…It is evident that χ spin (T ) decreases rapidly towards zero at low temperatures which unambiguously establishes a spin gap in the excitation spectrum. 11,27 It is to be noted that our attempt to fit the χ(T ) data using coupled dimer model didnot improve the fitting significantly and the obtained value of inter-dimer coupling (J ) was not at all reliable. This implies that the spin-lattice behaves more like isolated dimers rather than coupled dimers.…”

Section: B Magnetic Susceptibilitymentioning

confidence: 87%

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

Excitation of local magnetic moments by tunneling electrons

Gauyacq

Lorente

Novaes

2012

Progress in Surface Science

View full text Add to dashboard Cite

The advent of milli-kelvin scanning tunneling microscopes (STM) with inbuilt magnetic fields has opened access to the study of magnetic phenomena with atomic resolution at surfaces. In the case of single atoms adsorbed on a surface, the existence of different magnetic energy levels localized on the adsorbate is due to the breaking of the rotational invariance of the adsorbate spin by the interaction with its environment, leading to energy terms in the meV range. These structures were revealed by STM experiments in IBM Almaden in the early 2000's for atomic adsorbates on CuN surfaces. The experiments consisted in the study of the changes in conductance caused by inelastic tunnelling of electrons (IETS, Inelastic Electron Tunnelling Spectroscopy). Manganese and Iron adatoms were shown to have different magnetic anisotropies induced by the substrate. More experiments by other groups followed up, showing that magnetic excitations could be detected in a variety of systems: e.g. complex organic molecules showed that their magnetic anistropy was dependent on the molecular environment, piles of magnetic molecules showed that they interact via intermolecular exchange interaction, spin waves were excited on ferromagnetic surfaces and in Mn chains, and magnetic impurities have been analyzed on semiconductors. These experiments brought up some intriguing questions: the efficiency of magnetic excitations was very high, the excitations could or could not involve spin flip of the exciting electron and singular-like behavior was sometimes found at the excitation thresholds. These facts called for extended theoretical analysis; perturbation theories, sudden-approximation approaches and a strong coupling scheme successfully explained most of the magnetic inelastic Preprint submitted to Progress in Surface Science May 9, 2018 processes. In addition, many-body approaches were also used to decipher the interplay between inelastic processes and the Kondo effect. Spin torque transfer has been shown to be effective in changing spin orientations of an adsorbate in theoretical works, and soon after it was shown experimentally. More recently, the previoulsy mentioned strong coupling approach was extended to treat the excitation of spin waves in atomic chains and the ubiquitous role of electron-hole pair creation in de-exciting spins on surfaces has been analyzed. This review article expounds these works, presenting the theoretical approach by the authors while trying to thoroughly review parallel theoretical and experimental works.

show abstract

Frustrated couplings between alternating spin-12chains in AgVOAsO4

Cited by 39 publications

References 68 publications

Alternating spin chain compound AgVOAsO4 probed by As75 NMR

Alternating spin chain compound AgVOAsO4 probed by As75 NMR

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

Excitation of local magnetic moments by tunneling electrons

Contact Info

Product

Resources

About

Frustrated couplings between alternating spin-12chains in AgVOAsO4

Cited by 39 publications

References 68 publications

Alternating spin chain compound AgVOAsO4 probed by As75 NMR

Alternating spin chain compound AgVOAsO4 probed by As75 NMR

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

Excitation of local magnetic moments by tunneling electrons

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