Bose-glass melting in the cubic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi mathvariant="normal">K</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">B</mml:mi><mml:mi mathvariant="normal">a</mml:mi><mml:mo>)</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">BiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><m

Klein, Thierry; Conde-Gallardo, A.; Joumard, Isabelle; Marcus, J.; Beek, C.J. van der; Kończykowski, M.

doi:10.1103/physrevb.61.r3830

Cited by 23 publications

(28 citation statements)

References 26 publications

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“…As already mentioned, effects of point disorder are weaker in lower H (and for less anisotropic systems), and hence, as in the figure, the solid curve T G (H) in high enough fields approaches the dashed curve from lower fields. This tendency is opposite to that in the Bose-glass case with additional point defects [9,14] and seems to be consistent with features of the irreversibility lines in Ref. [8].…”

supporting

confidence: 84%

“…Since the TBs in this case have another persistent direction parallel to H leading to the transverse Meissner effect [1,5], this situation has been treated so far rather as an analogue of the Bose-glass case [17] by neglecting a TB's persistent direction within the a-b plane. Then, one would expect an increase of t G just like in the Boseglass case [9,14]. However, a lowering of t G (H) [10] due to the TBs was observed (see Fig.3 in Ref.…”

Section: Far As T G (H) or H G (T ) Lies Above If Any A Brg Meltingmentioning

confidence: 88%

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Suppression of the vortex glass transition due to correlated defects with a persistent direction perpendicular to an applied magnetic field

Ikeda

Myojin

2004

Phys. Rev. B

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It is found in terms of the lowest Landau level approach for the Ginzburg-Landau model that, in bulk type II superconductors with correlated defects, such as columnar defects, with a persistent direction perpendicular to an applied field H, a continuous vortex-glass transition should be depressed to a low enough temperature in the limit of weak point disorder. Based on this finding, remarkable reductions of the glass transition temperatures, seen in twin-free YBCO with columnar defects in H ⊥ c and twinned YBCO in H c, are discussed. It is pointed out that, in both of these two situations, the critical scaling of vanishing resistivities is anisotropic in spite of an isotropic scaling of correlation lengths and hence, makes it possible to determine two critical exponents by changing the relative angle between the current and the correlated defects.PACS numbers: 74.20. De, 74.25.Fy, 74.40.+k, 74.25.Qt, 74.72.Bk It is well understood that, in three-dimensional (3D) type II superconductors with correlated line defects, a continuous vortex-glass transition (the so-called Boseglass transition) [1] should occur in nonzero magnetic fields parallel to the line defects. Since this glass ordering is conceptually and formally equivalent to the corresponding quantum transition in 2D case, it should be described according to Ref.[2] as a long-ranged phase coherence measured by the glass correlation functionwhich was introduced to describe the vortex-glass transition in 3D due to point defects [3]. Here, ψ is the pairfield, denotes the thermal average, and [ ] implies the average over a quenched randomness. Examining eq.(1) under the Ginzburg-Landau (GL) hamiltonian [4]with random potentials u and f is a natural starting point for understanding a glass transition, characterized by the disappearance of the Ohmic resistance, in vortex states as far as the transition is continuous [3,4,5,6], where, and φ 0 is the flux quantum.In this note, we argue that, in a field perpendicular to strong line disorder, such a continuous vortex-glass transition does not occur at nonzero temperatures as far as no point disorder is present, and hence that, with increasing point disorder, the (dimensionless) glass transition temperature t G = T G /T c0 in this case is elevated in contrast to the case [7] with no line disorder, where T c0 is the zero field transition in each sample. Our interest in phenomena in this field configuration was motivated by an observation [8] in twin-free YBCO with heavy-ions irradiated along the c-axis. In contrast to the material (intrinsic) anisotropy on the width of the vortex-liquid region between H c and H ⊥ c cases in a unirradiated sample of cuprates, the vortex-liquid region of an irradiated sample in H ⊥ c is much wider, in particular in lower H, compared with the corresponding one in H c and has almost the same extent as that of the unirradiated sample in H c. Although, at the microscopic level, a heavy-ion irradiation in cuprates may correspond to an overdoping and hence, lead to a reduction of the intrinsi...

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supporting

confidence: 84%

Section: Far As T G (H) or H G (T ) Lies Above If Any A Brg Meltingmentioning

confidence: 88%

Suppression of the vortex glass transition due to correlated defects with a persistent direction perpendicular to an applied magnetic field

Ikeda

Myojin

2004

Phys. Rev. B

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“…The "melting" line is thus progressively shifted upwards with increasing irradiation doses (on the contrary, this line is pushed downwards as the amount of point defects in increased). A very similar upward shift of the irreversibility line (IRL for which ρ → 0) in the presence of columnar defects has also been observed in (K,Ba)BiO 3 [13].…”

Section: The Order-disorder Transition Linesupporting

confidence: 55%

Vortex Melting and Superconducting Transition in High-Tc Oxides

Klein¹,

Marcus²,

Marcenat

2004

Czech J Phys

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The existence of an order-disorder phase transition which can be induced in the vortex matter of type II superconductors by increasing T or H is now well established. At high temperatures the location of the so-called vortex melting line can then be shifted either downwards or upwards by introducing point or columnar defects. We show that the introduction of the latter in (K,Ba)BiO3 single crystals has also a strong influence on the transition from superconducting to normal state.

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“…The angular width of the cusp shrinks when the field increases but remains almost constant for H у4 T. Interestingly enough, the cusp exists up to the highest magnetic fields we measured ͑18 T͒. This may be compared to the behavior reported for T BG () in (Ba,K)BiO 3 irradiated cubic crystals, 10 where the cusp gradually disappears upon surpassing the matching field B , in which the number of vortices equals the number of the columnar defects. The absence of saturation in our experiments indicates that the twin boundary potentials are still efficient to induce vortex confinement and localization in a field range in which induced columnar tracks with B Ϸ18 T would destroy the superconducting properties of the crystal.…”

mentioning

confidence: 58%

“…An interesting point related to the shape of the cusp, however, has gone unnoticed in the literature. While in samples with columnar defects the transition curve is well described by T BG ()ϳ1Ϫ͉͉ at small angles, 8,10,11 in twinned crystals a nonlinear transition curve 6,7,9,12,13 is observed. Monte Carlo simulations of the Bose-glass melting 4 in a vortex system interacting with linear defects gave Ϸ1, which, through Eq.…”

mentioning

confidence: 89%

Vortex solid state inYBa2Cu3O7−
Maiorov
¹
,
Osquiguil
²

2001
Phys. Rev. B
13
6
10
0
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We report on the scaling of transport properties around the vortex melting in YBa 2 Cu 3 O 7Ϫ␦ oriented-twin single crystals in applied magnetic fields between 1 T and 18 T. We find that for the whole measured field range the linear resistivity scales as (t,)ϳt sy F Ϯ (sin()t Ϫsx ), with tϭ͉TϪT BG ͉ and the angle between planar defects and the magnetic field. The scaling is valid only for angles where the transition temperature T BG () shows a cusp. The critical exponents sx and sy are in agreement with the values predicted by Lidmar and Wallin ͓Europhys. Lett. 47, 494 ͑1999͔͒ only at magnetic fields below 4 T. A change in the value of sx from sxϭ1Ϯ0.2 to sxϭ3Ϯ0.2 at around H cr Ϸ4 T when the magnetic field is increased is responsible for changes in the shape of the T BG () curve and in the dependence of the linear dissipation on temperature and angle. The results strongly suggest the existence of a different vortex glassy phase in twinned crystals compared to the Bose-glass state found in samples with linear defects.

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Bose-glass melting in the cubic(K,Ba)BiO3high-

Cited by 23 publications

References 26 publications

Suppression of the vortex glass transition due to correlated defects with a persistent direction perpendicular to an applied magnetic field

Suppression of the vortex glass transition due to correlated defects with a persistent direction perpendicular to an applied magnetic field

Vortex Melting and Superconducting Transition in High-Tc Oxides

Vortex solid state inYBa2Cu3O7−
Maiorov
¹
,
Osquiguil
²

2001
Phys. Rev. B
13
6
10
0
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Bose-glass melting in the cubic(K,Ba)BiO3high-

Cited by 23 publications

References 26 publications

Suppression of the vortex glass transition due to correlated defects with a persistent direction perpendicular to an applied magnetic field

Suppression of the vortex glass transition due to correlated defects with a persistent direction perpendicular to an applied magnetic field

Vortex Melting and Superconducting Transition in High-Tc Oxides

Vortex solid state inYBa2Cu3O7−Maiorov1, Osquiguil2 2001Phys. Rev. B136100View full textAdd to dashboardCite

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Vortex solid state inYBa2Cu3O7−
Maiorov
¹
,
Osquiguil
²

2001
Phys. Rev. B
13
6
10
0
View full text Add to dashboard Cite