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Pratt, F. L.; Blundell, Stephen J.; Pattenden, P.A.; Hayes, W.; Chow, K. H.; Monkman, Andrew P.; Ishiguro, Takehiko; Ishida, K.; Nagamine, K.

doi:10.1023/a:1012652816077

Cited by 31 publications

(14 citation statements)

References 6 publications

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“…5, the muon-spin depolarization rate is found to decrease with increasing LF with a nearly square-root LF-dependence, suggesting the existence of one-dimensional (ID) diffusion of a magnetically excited state of the Cu spins. 20 The LF dependence is different from that of the Zn-substituted sample with x = 0.60 affected by the AF ordering, as shown in Fig. 5.…”

Section: /8 Anomaly In the Bi-2212 Phasementioning

confidence: 84%

POSSIBLE CHARGE AND/OR SPIN ORDERING IN THE Bi-2212, Y-123 AND La-214 PHASES

Koike

Akoshima

Aoyama

et al. 2000

Int. J. Mod. Phys. B

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Our recent experimental studies on the so-called 1/8 anomaly in the Bi-2212 and Y-123 phases and also on the new anomaly in the overdoped region of the La-214 phase are reviewed. In the partially Zn-substituted Bi-2212 and Y-123 phases, we have found anomalous suppression of superconductivity (SC) at p (the hole concentration per Cu in the Cu02 plane) ~ 1/8, and it has been found from the muon-spin-relaxation (/^SR) measurements that the magnetic correlation between Cu spins is enhanced singularly at p ~ 1/8. Furthermore, we have found giant suppression of SC singularly at x = 0.21 in the 1% Zn-substituted single-crystals of La2-xSr x Cui_ 1/ Zn 3/ 04 (LSCZO), and it has been found from the /xSR measurements that the magnetic correlation is also enhanced at x = 0.21. These results suggest that the dynamical stripe correlations of holes and spins exist in the Bi-2212 and Y-123 phases as well as in the La-214 phase and that they tend to be pinned by a small amount of Zn, leading to quasi-static stripe order and the suppression of SC at p ~ 1/8 in the Bi-2212, Y-123, La-214 phases and also at a; = 0.21 in LSCZO. If this tendency is the case in a wide range of p> it is possible to understand the universal experimental results in the high-T c cuprates that Zn is a strong scatterer in the unitarity limit and that the Zn substitution markedly suppresses SC.

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Section: /8 Anomaly In the Bi-2212 Phasementioning

confidence: 84%

POSSIBLE CHARGE AND/OR SPIN ORDERING IN THE Bi-2212, Y-123 AND La-214 PHASES

Koike

Akoshima

Aoyama

et al. 2000

Int. J. Mod. Phys. B

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“…ÿ1=2 to a power law behavior above a crossover frequency proportional to D ? [19,20]. When n 0:5 the ideal 1D power law 2D k !…”

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confidence: 99%

Low-Temperature Spin Diffusion in a Highly IdealS=12Heisenberg Antiferromagnetic Chain Studied by Muon Spin Relaxation

et al. 2006

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The organic radical-ion salt DEOCC-TCNQF4 contains linear chains of stacked molecules with significant Heisenberg antiferromagnet interactions along the chain and extremely weak interactions between the chains. Zero-field muSR has confirmed the absence of long-range magnetic order down to 20 mK and field-dependent muSR is found to be consistent with diffusive motion of the spin excitations. The anisotropic spin dynamics and the upper boundary for magnetic ordering temperature both indicate interchain magnetic coupling /J'/<7 mK. As the intrachain coupling J is 110 K, /J'/J/ is significantly less than 10(-4). This system therefore provides one of the most ideal examples of the one-dimensional S=1/2 Heisenberg antiferromagnet yet discovered.

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“…Such a model describes the two-dimensional (2D) spinon diffusion within a QSL state [dot-dashed line in Fig. 4(b)] [26]. We obtain an exchange coupling constant J = 0.124 T (∼0.08 K) in the field range of 0 < H 120 G. This value is one order of magnitude smaller than J ≈ 0.5 K, inferred from the ab initio calculations [17].…”

Section: Resultsmentioning

confidence: 62%

“…Second, we use a diffusive model with the dependence λ LF ∝ H −n , yielding the exponent n = 0.32(4) for 0 < H 120 G. The obtained exponent is somewhat smaller than the theoretically predicted value of n = 0.5 for the onedimensional diffusive model [26]. Finally, we use the cutoff of a power-law behavior at small external magnetic fields arising from three-dimensional diffusion, coupling, anisotropy, or, possibly, randomness.…”

Section: Resultsmentioning

confidence: 81%

Unconventional spin excitations in the S=32 triangular antiferromagnet RbAg2Cr[VO
Lee
¹
,
Klauer
²
,
Menten
³

et al. 2020
Phys. Rev. B
6
0
6
0
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We present muon spin relaxation (μSR) measurements of the S = 3/2 undistorted triangular lattice established in RbAg 2 Cr[VO 4 ] 2. The zero-(ZF) and longitudinal-field μSR spectra evidence the absence of spin freezing and long-range magnetic ordering down to T = 25 mK, supporting the formation of a dynamic ground state. Noticeably, we observe an anomalous temperature dependence of the ZF muon spin relaxation rate λ ZF (T), featuring a decrease below T = 20 K. This suggests the alteration of the dominant relaxation mechanism by the development of short-range magnetic correlations. A subsequent leveling off of λ ZF (T) below T = 2 K indicates persistent spin dynamics and reveals the presence of exotic magnetic excitations. The field dependence of the muon spin relaxation rate at T = 25 mK is well described by a diffusive spin transport model with algebraic spin-spin correlations. The suppressed long-range order and the peculiar temperature-dependent behavior of λ ZF (T) will be discussed in terms of the exchange interaction between Cr 3+ moments via nonmagnetic [VO 4 ] 3− entities. In the title compound, the degeneracy of the t 2g-orbital set is not lifted by a space group symmetry reduction or subject to significant anisotropy resulting from spin-orbit coupling.

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Cited by 31 publications

References 6 publications

POSSIBLE CHARGE AND/OR SPIN ORDERING IN THE Bi-2212, Y-123 AND La-214 PHASES

POSSIBLE CHARGE AND/OR SPIN ORDERING IN THE Bi-2212, Y-123 AND La-214 PHASES

Low-Temperature Spin Diffusion in a Highly IdealS=12Heisenberg Antiferromagnetic Chain Studied by Muon Spin Relaxation

Unconventional spin excitations in the S=32 triangular antiferromagnet RbAg2Cr[VO
Lee
¹
,
Klauer
²
,
Menten
³

et al. 2020
Phys. Rev. B
6
0
6
0
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Untitled

Cited by 31 publications

References 6 publications

POSSIBLE CHARGE AND/OR SPIN ORDERING IN THE Bi-2212, Y-123 AND La-214 PHASES

POSSIBLE CHARGE AND/OR SPIN ORDERING IN THE Bi-2212, Y-123 AND La-214 PHASES

Low-Temperature Spin Diffusion in a Highly IdealS=12Heisenberg Antiferromagnetic Chain Studied by Muon Spin Relaxation

Unconventional spin excitations in the S=32 triangular antiferromagnet RbAg2Cr[VOLee1, Klauer2, Menten3 et al. 2020Phys. Rev. B6060View full textAdd to dashboardCite

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Unconventional spin excitations in the S=32 triangular antiferromagnet RbAg2Cr[VO
Lee
¹
,
Klauer
²
,
Menten
³

et al. 2020
Phys. Rev. B
6
0
6
0
View full text Add to dashboard Cite