Low-temperature behavior of the ESR linewidth in a system with a spin gap:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>η</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>Na</mml:mi><mml:mn>1.286</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>

Chabre, F.; Ghorayeb, A.M.; Millet, P.; Pashchenko, V. A.; Stepanov, A.

doi:10.1103/physrevb.72.012415

Cited by 11 publications

(9 citation statements)

References 20 publications

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“…The high-field measurements, which we performed on this compound, coupled with a theoretical treatment of the high-field magnetization, allow us: ͑i͒ to confirm that the value of ⌬ is around 39 K, quite close to that which we had estimated from magnetic susceptibility and X-band ESR measurements; 5,7 ͑ii͒ to state that the magnetization data can be reproduced by several microscopic models of 18-spin 1 2 clusters with the common feature that they should not be restricted to nearest-neighbor couplings. Additional couplings, such as that in a 9 ϫ 2 spin ladder, or frustrating couplings, have to be introduced.…”

Section: Discussionsupporting

confidence: 76%

“…This value of H c corresponds to a gap of ϳ39 K, a value which is not far from the 35 K value which we estimated earlier. 5,7 More interestingly, the experimental curve of Fig. 1 shows a magnetization step occurring at around 43 T and at which the magnetization value is M Ӎ 0.11 B / V 4+ .…”

Section: A Magnetization: Experiments Resultsmentioning

confidence: 89%

“…8 imply a value of approximately 36 K for the gap, ⌬, in accordance with our previously published estimates. 5,7 A close examination of the data plotted in Fig. 8 indicates that the ratio A ͑40 K͒ / A ͑6 K͒ is ϳ215 when f = 9.6 GHz, whereas it is ϳ2.7 when f = 980 GHz.…”

Section: Electron Spin Resonance Resultsmentioning

confidence: 93%

“…4,5 A tentative estimate of the spin gap in -Na 1.286 V 2 O 5 was first given by Whangbo and Koo 6 who proposed a value of about 183 meV ͑hence equivalent to 2120 K͒ deduced from a theoretical calculation based on a spin-dimer analysis. However, our magnetic-susceptibility 5 and X-band ESR measurements 5,7 led us to propose quite a different estimate, whereby the gap, ⌬, would only be of the order of 35 K.…”

Section: Introductionmentioning

confidence: 80%

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High-field magnetization and electron spin resonance in the spin-gap systemη-Na1.286V2O5

Ghorayeb

Costes²,

Goiran³

et al. 2008

Phys. Rev. B

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To cite this version:A.M. Ghorayeb, M. Costes, M. Goiran, J. Broto, S. Schäfer, et al.. High-field magnetization and electron spin resonance in the spin-gap system η -Na 1.286 V 2 O 5. Physical Review B : Condensed matter and materials physics, American Physical Society, 2008, 77 (22) In this work, we report results of high-field magnetization and electron spin resonance ͑ESR͒ measurements performed on -Na 1.286 V 2 O 5 , a compound that shows a spin gap. This system may be regarded as an assembly of weakly interacting magnetic entities, each of which containing, at low temperature, 18 antiferromagnetically ͑AF͒-coupled S = 1 2 spins. The purpose of this work is to determine the gap value and to probe the low-lying energy levels in this compound. On the one hand, the high-field magnetization measurements, performed at temperatures down to 1.7 K on powder samples, suggest a spin gap, ⌬, of approximately 39 K, a value which is quite close to the earlier estimate of 35 K, which some of us deduced from the susceptibility measurements at low field ͓Duc et al., Phys. Rev. B 69, 094102 ͑2004͔͒. On the other hand, these measurements show a magnetization step at one ninth of the saturation magnetization, giving strong support to the assumption that this system may be regarded as a finite-size system composed of 18 AF-coupled S = 1 2 spins. A theoretical fit of the magnetization indicates the necessity to include couplings to second or more distant neighbors. The ESR data at various frequencies ͑from 9.6-980 GHz͒ and at temperatures ranging from 4.2-150 K, obtained on powder samples as well as on single crystals, are in accordance with the gap value mentioned above. In addition, these ESR data indicate that the closure of the gap is not accompanied by any detectable mixing between the singlet level and the lowest-lying level of the first excited triplet. This implies the absence of any appreciable Dzyaloshinskii-Moriya interaction in this compound.

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Section: Discussionsupporting

confidence: 76%

Section: A Magnetization: Experiments Resultsmentioning

confidence: 89%

Section: Electron Spin Resonance Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 80%

See 2 more Smart Citations

High-field magnetization and electron spin resonance in the spin-gap systemη-Na1.286V2O5

Ghorayeb

Costes²,

Goiran³

et al. 2008

Phys. Rev. B

Self Cite

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“…The X-band electron-spin resonance [6] and complementary magnetic susceptibility data [5] give additional evidence for the transition around 100 K and confirm the existence of the spin gap, which is estimated to be of the order of a e-mail: zoran.popovic@phy.bg.ac.yu 35 K. NMR study of spin gap in the vanadium bronze η-Na 1.286 V 2 O 5 [7] revealed that spin gap energy is vanadium site dependent. They estimated the gap value of 152 K, 54 K and 174 K for vanadium V(4)A, V(4)B and V(7)A sites, respectively.…”

Section: Introductionmentioning

confidence: 80%

Infrared reflectivity spectra of η-Na1.3V2O5 in the charge disordered and ordered phase

et al. 2008

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Abstract. We have measured the far-infrared reflectivity spectra of the sodium vanadium oxide η-Na1.3V2O5 polycrystals in the wide temperature (80-300 K) and frequency (150-1500 cm −1 ) range. Appearance of new phonon oscillators, phonon oscillator mode splitting and step-like shift of TO and LO frequencies at low temperatures are correlated with the charge-ordering phase transition, which takes place at about 120 K in this vanadium oxide. PACS

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Thermodynamic and resonant properties of mixed spin compounds ACuFe2(VO4)3 (A = Li, Na)

Koshelev

Shvanskaya

Волкова

et al. 2020

Journal of Alloys and Compounds

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Low-temperature behavior of the ESR linewidth in a system with a spin gap:η−Na1.286V2O5

Cited by 11 publications

References 20 publications

High-field magnetization and electron spin resonance in the spin-gap systemη-Na1.286V2O5

High-field magnetization and electron spin resonance in the spin-gap systemη-Na1.286V2O5

Infrared reflectivity spectra of η-Na1.3V2O5 in the charge disordered and ordered phase

Thermodynamic and resonant properties of mixed spin compounds ACuFe2(VO4)3 (A = Li, Na)

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