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Zuo, F.; Khizroev, Sakhrat; Alexandrakis, G. C.; Kopylov, V. N.

doi:10.1103/physrevb.52.r755

Cited by 42 publications

(14 citation statements)

References 21 publications

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“…51,52 One observes from Fig. 5 that there is some indication of deviation from this behavior at lower temperature and higher field, similar to those reported in BSCCO, 53,54 TBCO, 45 and NCCO. 44,54 A thorough study of this phenomenon is still needed to reveal its detailed underlying physical mechanism.…”

Section: Resultssupporting

confidence: 83%

“…As seen from the figure, the associated data fit extremely well with the exponential relation 45 given by H sp (T)ϭH s0 exp(ϪT/T 0 ) for H s0 ϭ34.17 kOe and T 0 ϭ10.3 K. This curve clearly displays a highly sensitive temperature-dependent behavior. Additionally, the second peak appears to persist in the entire temperature range below T c .…”

Section: Resultsmentioning

confidence: 65%

“…43 and 44͒ and TBCO. 45 It is understood that the peak effect is generally associated with the transition between the ordered vortex quasilattice and the disordered ͑entangled͒ vortex glass states. The onset of this effect at H on is also understood to signify enhanced effectiveness of pinning due to higher flexibility of the vortex line lattice at higher temperature.…”

Section: Resultsmentioning

confidence: 99%

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Effects of Pb substitution on the vortex state of oxygen-overdoped Bi2Sr2CaCu2O8+δ single crystal

et al. 2000

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We show that excessive Pb substitution of Bi in oxygen-overdoped BSCCO-2212 single crystal further reduces the anisotropy ( c / a ratio͒ of the system in addition to enhancing disorder in its vortex system. These effects have led to the suppression of first-order vortex melting as well as a peculiar second-peak effect exhibiting a sensitive temperature dependence over an unusually broad temperature range. Our experimental data further reveal, in a Bi-based system, the presence of a disentangled vortex liquid phase separating the solid vortex from the entangled vortex liquid phase in the H-T diagram constructed from the transport and magnetization data. INTRODUCTIONThe unusually rich variety of vortex phases in the H-T phase diagram is one of the most remarkable features distinguishing the new copper oxide superconductors from the conventional type-II superconductors. The appearance of a vortex liquid phase over a large area in the H-T diagram initiated intensive research on the structure and characteristics of the liquid phase as well as the true nature of the related thermodynamical transition across its boundary with the solid phase. It has now been established theoretically 1-5 and confirmed experimentally 6-12 that vortex melting in a clean sample is a first-order transition, while the presence of disorder is likely to change its character into a more gradual or second-order process.It is also well known that the traditional picture of the solid vortex phase has been greatly modified by the presence of disorder and anisotropy. It has been found necessary to include, in addition to the ordered vortex lattice state at low H and T, the less ordered or disordered glassy state at the higher H-T regime. This is further complicated by the occurrence of dimensional crossover at a certain boundary within the solid phase. 2,8,13-15 Studies on second-peak effects in BSCCO-2212 superconductors also suggest further complications of the solid vortex phase. 16,17 No less complicated is the vortex liquid phase where a multiphase structure emerges as a result of the intricate interplay among the thermal fluctuation effect, the pinning, and Lorentz forces as well as the plastic response of the vortex lines in highly anisotropic superconductors. The BSCCO-2212 superconductor, among others, offers a particularly rich and novel phenomenology of the vortex system due to its high T c and strongly layered structure. It has thus become one of the most intensely studied systems to date. It is theoretically predicted that apart from the metal-like viscous liq-

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Pb substitution on the vortex state of oxygen-overdoped Bi2Sr2CaCu2O8+δ single crystal

et al. 2000

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“…[15][16][17][18][19][20][21][22] The pronounced peak effect observed in these materials has been associated with different pinning mechanisms signaling a nonuniversal origin of this phenomenon. A similar situation holds for cuprates where different models based on oxygendeficient sites, 23 surface barrier effects, 24 the matching between the vortex and defect lattices, 25 dimensional crossover, 26 etc., have been proposed to explain the enhancement of the flux pinning in the intermediate magnetic fields. Note here, that all the members of the iron pnictide family, with the exception of LiFeAs, have to be doped with charge carriers (sometimes directly into superconducting FeAs layers) in order to exhibit superconductivity.…”

Section: Introductionmentioning

confidence: 71%

Flux pinning and magnetic relaxation in Ga-doped LiFeAs single crystals

Shlyk

Bischoff

Rose

et al. 2012

Journal of Applied Physics

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The effect of nonmagnetic Ga3+ impurities on structural and superconducting properties of LiFeAs single crystals has been studied. The out-of-plane magnetization of the doped material exhibits a remarkable double-peak structure. The presence of a low-field peak observed both in doped and undoped LiFeAs is suggestive of intrinsic structural defects, while a secondary high-field fishtail maximum, which shifts progressively with temperature, is associated with the extrinsic pinning centers created by Ga. The superconducting transition temperature of Ga doped LiFeAs is suppressed by about 4.8 K/at. %. However, a set of superconducting parameters including the superconducting transition temperature, the coherence length, the upper critical field, and the irreversibility field are not significantly reduced in a sample doped with 0.5 at. % Ga. At this Ga concentration, the critical current density of doped LiFeAs is about four times that of our undoped material in intermediate magnetic fields at 5 K. The scaling of the normalized pinning force density Fp = JcB vs the applied field normalized by Bmax (Bmax denotes the peak position of Fpmax) in the temperature range 5–13 K indicates a single type of predominant flux-pinning mechanism provided by Ga additions. Analysis of the temperature and field dependencies of the magnetic relaxation is consistent with the collective pinning model. The magnetic relaxation measurements combined with the peak position of the critical current density in the B-T phase diagram suggests an elastic–plastic transition of the vortex lattice at higher temperatures and fields. The observed vortex behavior of Ga doped LiFeAs strongly resembles that of YBa2Cu3O7 doped with nonmagnetic impurities.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Contrary to the peak effect observed in conventional low-temperature superconductors, which occurs in the vicinity of upper critical field H c2 , AMP of HTS occurs well below H c2 . The presence of AMP is regarded as a generic feature of anisotropic and relatively clean high-temperature superconducting crystals.…”

Section: Introductionmentioning

confidence: 98%

Magnetic relaxation measurements on a heavily Pb-dopedBi2Sr2CaCu
Sun
¹
,
Song
²
,
Du
³

et al. 2002
Phys. Rev. B
7
1
6
0
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The magnetic relaxation measurements on a heavily Pb-doped Bi 2 Sr 2 CaCu 2 O 8ϩ␦ single crystal were carried out in the vicinity of both the anomalous magnetization peak H 2 p and its onset field H on at different temperatures. The results show that both the normalized magnetic relaxation rate S(ϭϪd ln M/d ln t) and the pinning potential U 0 exhibit remarkable changes near H on and H 2 p in the temperature region where H on (T) follows the relation of the disorder induced vortex lattice transition, H on (T)ϭH on (0)͓1Ϫ(T/T c ) 4 ͔ 3/2 . For both HϽH on and HϾH 2 p , S increases and U 0 decreases, respectively, with increasing magnetic fields. A negative power law of U 0 (H)ϰH Ϫ␣ was observed for both HϽH on and for HϾH 2 p . There exists a minimum in the magnetic-field dependence of S(H) and a maximum in the pinning potential U 0 (H) in the field range between H on and H 2 p . At lower temperature region where H on (T) deviates from the above relation, U 0 (H) behaves differently. The results are discussed in terms of both collective flux creep model and plastic flux creep model.

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Anomalous magnetization in single-crystalTl2Ba2

Cited by 42 publications

References 21 publications

Effects of Pb substitution on the vortex state of oxygen-overdoped Bi2Sr2CaCu2O8+δ single crystal

Effects of Pb substitution on the vortex state of oxygen-overdoped Bi2Sr2CaCu2O8+δ single crystal

Flux pinning and magnetic relaxation in Ga-doped LiFeAs single crystals

Magnetic relaxation measurements on a heavily Pb-dopedBi2Sr2CaCu
Sun
¹
,
Song
²
,
Du
³

et al. 2002
Phys. Rev. B
7
1
6
0
View full text Add to dashboard Cite

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Anomalous magnetization in single-crystalTl2Ba2

Cited by 42 publications

References 21 publications

Effects of Pb substitution on the vortex state of oxygen-overdoped Bi2Sr2CaCu2O8+δ single crystal

Effects of Pb substitution on the vortex state of oxygen-overdoped Bi2Sr2CaCu2O8+δ single crystal

Flux pinning and magnetic relaxation in Ga-doped LiFeAs single crystals

Magnetic relaxation measurements on a heavily Pb-dopedBi2Sr2CaCuSun1, Song2, Du3 et al. 2002Phys. Rev. B7160View full textAdd to dashboardCite

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About

Magnetic relaxation measurements on a heavily Pb-dopedBi2Sr2CaCu
Sun
¹
,
Song
²
,
Du
³

et al. 2002
Phys. Rev. B
7
1
6
0
View full text Add to dashboard Cite