Very-Low-Frequency Excitations in Frustrated Two-Dimensional<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">S</mml:mi><mml:mi mathvariant="italic" /><mml:mo>=</mml:mo><mml:mi /><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>Heisenberg Antiferromagnets

Carretta, P.; Melzi, Roberto; Papinutto, N.; Millet, P.

doi:10.1103/physrevlett.88.047601

Cited by 52 publications

(43 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, in the prototypes of the J 1 -J 2 model, it has been observed that, similarly to what we found here, slow dynamics develop for T < J 1 + J 2 , at frequencies several orders of magnitude below k B (J 1 + J 2 )/ [15]. This has been ascribed to activated fluctuations of domain walls separating regions with (π/a,0) and (0,π/a) correlations.…”

Section: Discussionsupporting

confidence: 62%

“…In iron pnictides, slow fluctuations have been argued to arise from the motion of domain walls [12][13][14] that separate (π/a,0) and (0,π/a) correlated spin fluctuations, a situation analogous to that observed in frustrated vanadates [15]. The slowing down of domain wall fluctuations may be related to pinning driven by quenched disorder [7] or might be intrinsically due to underlying geometric frustration and long-range Coulomb repulsion [16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Persistence of slow fluctuations in the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors

Bossoni

Moroni

Julien

et al. 2016

Self Cite

View full text Add to dashboard Cite

We present nuclear magnetic resonance evidence that very slow ( 1 MHz) spin fluctuations persist into the overdoped regime of Ba(Fe 1−x Rh x ) 2 As 2 superconductors. Measurements of the 75 As spin echo decay rate, obtained both with Hahn Echo and Carr Purcell Meiboom Gill pulse sequences, show that the slowing down of spin fluctuations can be described by short-range diffusive dynamics, likely involving domain walls motions separating (π/a,0) from (0,π/a) correlated regions. This slowing down of the fluctuations is weakly sensitive to the external magnetic field and, although fading away with doping, it extends deeply into the overdoped regime.

show abstract

Section: Discussionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Persistence of slow fluctuations in the overdoped regime of Ba(Fe1-xRhx)2As2 superconductors

Bossoni

Moroni

Julien

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…If X is a main group (p) cation, the leading coupling is AFM J 2 , whereas J 1 is usually weaker and can be either FM (X = P) or AFM (X = Si, Ge), see also Table VII. 11,13,14 Recent efforts in crystal growth 15 and experimental investigation [16][17][18][19][20] of such compounds established the columnar AFM ground state [21][22][23] and revealed simple trends in thermodynamic properties, 15,24,25 in line with theoretical predictions.…”

Section: Introductionmentioning

confidence: 76%

Phase separation and frustrated square lattice magnetism of Na1.5VOPO4F0.5<

et al. 2011

View full text Add to dashboard Cite

Crystal structure, electronic structure, and magnetic behavior of the spin-1 2 quantum magnet Na1.5VOPO4F0.5 are reported. The disorder of Na atoms leads to a sequence of structural phase transitions revealed by synchrotron x-ray powder diffraction and electron diffraction. The hightemperature second-order α ↔ β transition at 500 K is of the order-disorder type, whereas the low-temperature β ↔ γ + γ transition around 250 K is of the first order and leads to a phase separation toward the polymorphs with long-range (γ) and short-range (γ ) order of Na. Despite the complex structural changes, the magnetic behavior of Na1.5VOPO4F0.5 probed by magnetic susceptibility, heat capacity, and electron spin resonance measurements is well described by the regular frustrated square lattice model of the high-temperature α-polymorph. The averaged nearestneighbor and next-nearest-neighbor couplings are J1 −3.7 K and J2 6.6 K, respectively. Nuclear magnetic resonance further reveals the long-range ordering below TN = 2.6 K in low magnetic fields. Although the experimental data are consistent with the simplified square-lattice description, band structure calculations suggest that the ordering of Na atoms introduces a large number of inequivalent exchange couplings that split the square lattice into plaquettes. Additionally, the direct connection between the vanadium polyhedra induces an unusually strong interlayer coupling having effect on the transition entropy and the transition anomaly in the specific heat. Peculiar features of the low-temperature crystal structure and the relation to isostructural materials suggest Na1.5VOPO4F0.5 as a parent compound for the experimental study of tetramerized square lattices as well as frustrated square lattices with different values of spin.

show abstract

“…slow and inhomogeneous) under the influence of quenched disorder or in the case of competing interactions [11]. In iron-pnictides, slow fluctuations have been argued to arise from the motion of domain walls [12][13][14] that separate (π/a, 0) and (0, π/a) correlated spin fluctuations, a situation analogous to that observed in frustrated vanadates [15]. The slowing down of domain wall fluctuations may be related to pinning driven by quenched disorder [7] or might be intrinsically due to underlying geometric frustration and long-range Coulomb repulsion [16].…”

Section: Introductionmentioning

confidence: 97%

Persistence of slow fluctuations in the overdoped regime ofBa(Fe1−xRhx)2As2super

Bossoni¹,

Moroni²,

Julien³

et al. 2016

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We present nuclear magnetic resonance evidence that very slow (≤ 1 MHz) spin fluctuations persist into the overdoped regime of Ba(Fe1−xRhx)2As2 superconductors. Measurements of the 75 As spin echo decay rate, obtained both with Hahn Echo and Carr Purcell Meiboom Gill pulse sequences, show that the slowing down of spin fluctuations can be described by short-range diffusive dynamics, likely involving domain walls motions separating (π/a, 0) from (0, π/a) correlated regions. This slowing down of the fluctuations is weakly sensitive to the external magnetic field and, although fading away with doping, it extends deeply into the overdoped regime.

show abstract

Very-Low-Frequency Excitations in Frustrated Two-DimensionalS=12Heisenberg Antiferromagnets

Cited by 52 publications

References 16 publications

Persistence of slow fluctuations in the overdoped regime of Ba(Fe<sub>1-x</sub>Rh<sub>x</sub>)<sub>2</sub>As<sub>2</sub> superconductors

Persistence of slow fluctuations in the overdoped regime of Ba(Fe<sub>1-x</sub>Rh<sub>x</sub>)<sub>2</sub>As<sub>2</sub> superconductors

Phase separation and frustrated square lattice magnetism of Na1.5VOPO4F0.5<

Persistence of slow fluctuations in the overdoped regime ofBa(Fe1−xRhx)2As2super

Contact Info

Product

Resources

About