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Williams, G. V. M.; Tallon, J. L.; Dupree, R.; Michalak, R.

doi:10.1103/physrevb.54.9532

Cited by 23 publications

(9 citation statements)

References 28 publications

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“…This is in contrast to the robust pseudogap behavior of the uniform spin susceptibility. 11,[20][21][22] The wipeout effect is also observed at low temperatures near the critical impurity concentration x c . The existence of a long-range magnetic ordering or of a spin glass state in the wipeout effect remain topics for future discussion.…”

Section: Analyzed the Experimental Recovery Curve P(t)≡1-m(t)/m(∞)mentioning

confidence: 99%

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Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa₂Cu₄O₈

et al. 2001

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We studied low-frequency spin dynamics near the impurity-induced superconductor-to-insulator transition for underdoped high-T c superconductor YBa 2 (Cu 1-x M x ) 4 O 8 (M=Ni, Zn) using the Cu nuclear quadrupole resonance (NQR) spin-echo technique. We observed remarkable suppression of the normalstate pseudo spin-gap and a loss of Cu NQR spectrum intensity at low temperatures around the critical impurity concentration.

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Section: Analyzed the Experimental Recovery Curve P(t)≡1-m(t)/m(∞)mentioning

confidence: 99%

“…20 and 21) are plotted against Ni or Zn content x. On approaching the superconductor-toinsulator transition, the pseudogap is robust, 11,[20][21][22] whereas the pseudo spin-gap is suppressed rapidly. The impurity effect on T s is different from the monotonic decrease of T s in ref.…”

Section: Analyzed the Experimental Recovery Curve P(t)≡1-m(t)/m(∞)mentioning

confidence: 99%

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa₂Cu₄O₈

et al. 2001

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“…It contrasts with the case of Zn, for which p eff decreases by a factor of 2.4 from O 6.6 to O 7 . Most NMR studies on impurity effects have been carried out with 89 Y or 63 Cu [11,12,14,15]. For 63 Cu nuclei, the large H hf leads to NMR spectra too broad to allow standard NMR Fourier transform spectroscopy.…”

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confidence: 99%

Using Ni Substitution and17ONMR to Probe the Susceptibilityχ′(q)
Bobroff
¹
,
Alloul
²
,
Yoshinari
³

et al. 1997
Phys. Rev. Lett.
82
7
92
2
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We present CuO 2 plane 17 O NMR measurements for Ni-substituted YBa 2 Cu 3 O 61y . The Ni moment induces an oscillatory spin density responsible for the broadening of the NMR line. In slightly overdoped y 1 compounds, this broadening scales with the Ni susceptibility. In contrast, such a scaling is not found in underdoped y 0.6 samples. We associate it with the T dependence of the antiferromagnetic staggered spin susceptibility x 0 ͑Q AF ͒ intrinsic to the CuO 2 planes. Discussion with respect to 63 Cu NMR transverse relaxation (T 2G ) and neutron scattering data shows that the AF correlation length j is T independent. [S0031-9007 (97)03937-9] PACS numbers: 74.25.Nf, 74.62.DhThe normal state of high-T c superconductors exhibits a peculiar magnetic behavior, distinct from that of a normal metal [1]. In the underdoped regime, well above T c , the static susceptibility x͑q 0͒ shows an anomalous "pseudogap" decrease with decreasing temperature T [2]. Simultaneously, antiferromagnetic (AF) correlations occur within the CuO 2 planes, as evidenced by an enhancement of the imaginary part of the susceptibility x 00 near the AF wave vector seen both in neutron scattering [3] and 63 Cu NMR longitudinal relaxation time [4]. These AF correlations might play a crucial role in the mechanism of superconductivity in these materials [5]. Thus, the AF correlation length j and both the imaginary and the real part of the staggered susceptibility at Q AF are major parameters for any coherent description of the cuprates. No clear experimental agreement on the T dependence of j and x 0 ͑q͒ is yet achieved. An integral information on x 0 ͑q͒ is available through 63 Cu transverse relaxation data ( 63 T 2G ) [6-9]. These data are usually analyzed as an increase of j at low T [10], whereas neutron experiments for x 00 suggest that j is T independent in YBa 2 Cu 3 O 61y [3]. No other technique has been used up to now to determine x 0 ͑q͒ at q fi 0.We propose here a new approach to probe x 0 ͑q͒, using magnetic impurity substitution effects in the CuO 2 planes. The impurity magnetic moment gm B ͗S Z ͘ acts as a local field H͑r͒~͗S Z ͘d͑r͒, which induces an in-plane spin polarization s͑r͒~x 0 ͑r͒͗S Z ͘. This polarization may be probed by the NMR of nuclei coupled to the planes: at r from the impurity, the NMR frequency shift dnH hf x 0 ͑r͒͗S Z ͘ is due to the hyperfine coupling H hf with the spin density. Hence, the broadening due to the shift distribution among the nuclei yields information on x 0 ͑r͒. We will show here that the use of the 17 O NMR probe allows us, for the first time, a thorough investigation of x 0 ͑r͒. This approach contrasts with the usual impurity studies of the specific properties of the magnetic defects [11] and their influence on superconductivity [12]. We find an anomalously large T variation of the 17 O linewidth for the underdoped composition. The specific geometry of the 17 O nuclei within the planes allows us through extended numerical simulations to demonstrate that the 17 O linewidth probes the amplitude of x 0 ...

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“…(12) to hold. This is in fact the experimental situation [23,24]. In the optimal or overdoped case, we believe the S = 1 moment will be partially screened, so that an S = 1/2 local moment remains.…”

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confidence: 99%

Kondo Effect in High-TcCuprates

Nagaosa

Lee

1997

Phys. Rev. Lett.

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Transport and NMR studies of the effect of Ni substitution on superconductivity and the normal-state pseudogap inYBa2Cu

Cited by 23 publications

References 28 publications

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa₂Cu₄O₈

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa₂Cu₄O₈

Using Ni Substitution and17ONMR to Probe the Susceptibilityχ′(q)
Bobroff
¹
,
Alloul
²
,
Yoshinari
³

et al. 1997
Phys. Rev. Lett.
82
7
92
2
View full text Add to dashboard Cite

Kondo Effect in High-TcCuprates

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Transport and NMR studies of the effect of Ni substitution on superconductivity and the normal-state pseudogap inYBa2Cu

Cited by 23 publications

References 28 publications

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa2Cu4O8

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa2Cu4O8

Using Ni Substitution and17ONMR to Probe the Susceptibilityχ′(q)Bobroff1, Alloul2, Yoshinari3 et al. 1997Phys. Rev. Lett.827922View full textAdd to dashboardCite

Kondo Effect in High-TcCuprates

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Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa₂Cu₄O₈

Spin Dynamics near the Superconductor-to-Insulator Transition in Impurity-Doped YBa₂Cu₄O₈

Using Ni Substitution and17ONMR to Probe the Susceptibilityχ′(q)
Bobroff
¹
,
Alloul
²
,
Yoshinari
³

et al. 1997
Phys. Rev. Lett.
82
7
92
2
View full text Add to dashboard Cite