Vortex melting in polycrystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="ht

Reyes, A. P.; Tang, Xiufeng; Bachman, H. N.; Halperin, W. P.; Martindale, J. A.; Hammel, P. C.

doi:10.1103/physrevb.55.r14737

Cited by 36 publications

(34 citation statements)

References 13 publications

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“…At T =5 K, the Redfield pattern indicates the vortex lattice. The similar, but narrow, coexistence region was first reported for YBa 2 Cu 3 O 7 [25,26]. The detailed measurement of vortex phase is in progress for our Tl2201 sample.…”

Section: Figure 5(a) Showsmentioning

confidence: 55%

Vortex States of Tl₂Ba₂CuO_6+δStudied via²⁰⁵Tl NMR at 2 Tesla

et al. 2005

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We report a 205 Tl NMR study of vortex state for an aligned polycrystalline sample of an overdoped high-Tc superconductor Tl2Ba2CuO 6+δ (Tc ∼85 K) with magnetic field 2 T along the c axis. We observed an imperfect vortex lattice, so-called Bragg glass at T =5 K, coexistence of vortex solid with liquid between 10 and 60 K, and vortex melting between 65 and 85 K. No evidence for local antiferromagnetic ordering at vortex cores was found for our sample. 74.25.Nf, 74.72.Jt,

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Section: Figure 5(a) Showsmentioning

confidence: 55%

Vortex States of Tl₂Ba₂CuO_6+δStudied via²⁰⁵Tl NMR at 2 Tesla

et al. 2005

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“…Above 77 and 60K respectively, we found δB = 0 within error bars (±4 G). For optimally doped samples and applied fields of a few Tesla, it has been shown that the vortices are in a liquid state in our range of temperatures below T c [13] [14]. Each vortex is then moving much faster than the NMR timescale, which averages out both the broadening and the screening effects, leading to δB = 0.…”

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confidence: 83%

Persistence of Li Induced Kondo Moments in the Superconducting State of Cuprates

et al. 2001

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Using7 Li NMR shift data, the anomalous local moment induced by spinless Li impurities persists below Tc in YBa2Cu3O6+y. In the underdoped regime, the moments retain their Curie law below Tc. In contrast, near optimal doping, the large Kondo screening observed above Tc (TK = 135 K) is strongly reduced below Tc as expected theoretically when the superconducting gap develops. The limited spatial extent of the induced moment (on 1 st near neighbour Cu) is not drastically modified below Tc, which allows a comparison with STM determination of the local density of states. Our results constrain theoretical models of the impurity electronic properties.The influence of impurities on superconductors has always been used as an effective probe of their actual properties. For example, while magnetic impurities are the most prominent s-wave pair breakers, any type of scattering is detrimental to d-wave superconductivity. To our knowledge, experimental investigation of the modifications of the magnetic properties of an impurity below the superconducting transition T c has never been performed. Macroscopic bulk magnetic experiments are unadapted since the various contributions to the susceptibility cannot easily be singled out below T c . Local measurements of the susceptibility of these moments using hyperfine techniques are in principle possible, but are usually prohibited by technical limitations, such as strong spin lattice relaxation effects for the impurity NMR.Despite this experimental void, an extensive theoretical work has been devoted to this question in classical Fermi liquids [1] [2]. The behavior of the moment below T c is predicted to depend both on the shape of the superconducting gap and on the Kondo temperature T K of the moment in the normal state. T K is a signature of the screening of the moment by the conduction electrons and is related to its coupling J to the carriers. The primary effect, anticipated, but not observed so far, is a reduction of the Kondo screening due to the pairing of the carriers. For small J, this results in a complete restoration at low T of the Curie susceptibility of the moment.In cuprate superconductors, which are correlated electronic systems, the magnetic properties of impurities are more intricate. In the normal state, spinless impurities like Zn We present here the first measurements of the induced moment properties below T c . they are performed using 7 Li NMR since the transferred hyperfine couplings are weak enough that relaxation effects do not prohibit NMR spectroscopy of the moment. We propose a method to extract the susceptibility χ loc probed at Li sites. This requires correcting the internal field seen by Li for screening and vortex effects due to superconductivity. It will then be shown that the Li induced moments survive below T c and that T K is strongly reduced. Furthermore, we will demonstrate that these induced moments remain confined primarily to the 1 st n.n. coppers below T c . Recent scanning tunneling microscopy (STM) experiments in the Zn substituted Bi2212 ...

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“…It occurs at T m /T c = 0.61 in H = 11.6 T, and indicates that there is a substantial temperature range below T c where fluctuating vortices are in a liquid-like phase. We can compare this with YBa 2 Cu 3 O 7−y (YBCO) 48 50 that a confluence of weak thermal fluctuations and a very broad distribution of pinning forces gives rise to an irreversibility field significantly less than the upper critical field in crystals of Ba(Fe 0.9 Co 0.1 ) 2 As 2 . Generally the NMR spectrum is sensitive to field fluctuations on time scales slower than the Larmor precession period which is tens of nanoseconds in our case.…”

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confidence: 88%

Vortex melting in polycrystallineYBa2Cu3
A. P. Reyes
¹
,
Xiufeng Tang
²
,
H. N. Bachman
³

et al.

Cited by 36 publications

References 13 publications

Vortex States of Tl₂Ba₂CuO_6+δStudied via²⁰⁵Tl NMR at 2 Tesla

Vortex States of Tl₂Ba₂CuO_6+δStudied via²⁰⁵Tl NMR at 2 Tesla

Persistence of Li Induced Kondo Moments in the Superconducting State of Cuprates

As75NMR of Ba(Fe0.93Co
Oh
¹
,
Mounce
²
,
Mukhopadhyay
³

et al. 2011
Phys. Rev. B
Self Cite
23
9
25
1
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Vortex melting in polycrystallineYBa2Cu3A. P. Reyes1, Xiufeng Tang2, H. N. Bachman3 et al.

Cited by 36 publications

References 13 publications

Vortex States of Tl2Ba2CuO6+δStudied via205Tl NMR at 2 Tesla

Vortex States of Tl2Ba2CuO6+δStudied via205Tl NMR at 2 Tesla

Persistence of Li Induced Kondo Moments in the Superconducting State of Cuprates

As75NMR of Ba(Fe0.93CoOh1, Mounce2, Mukhopadhyay3 et al. 2011Phys. Rev. BSelf Cite239251View full textAdd to dashboardCite

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About

Vortex melting in polycrystallineYBa2Cu3
A. P. Reyes
¹
,
Xiufeng Tang
²
,
H. N. Bachman
³

et al.

Vortex States of Tl₂Ba₂CuO_6+δStudied via²⁰⁵Tl NMR at 2 Tesla

Vortex States of Tl₂Ba₂CuO_6+δStudied via²⁰⁵Tl NMR at 2 Tesla

As75NMR of Ba(Fe0.93Co
Oh
¹
,
Mounce
²
,
Mukhopadhyay
³

et al. 2011
Phys. Rev. B
Self Cite
23
9
25
1
View full text Add to dashboard Cite