Study of the multicritical point in the vortex phase diagram<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi>H</mml:mi><mml:mi>‖</mml:mi><mml:mi>c</mml:mi><mml:mo>)</mml:mo></mml:math>of a weakly pinned crystal of<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:mrow><mml:msub><mml:mrow>

Pal, D.; Ramakrishnan, S.; Grover, A. K.; Dasgupta, D.; Sarma, Bimal K.

doi:10.1103/physrevb.63.132505

Cited by 36 publications

(21 citation statements)

References 26 publications

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“…Within this physical picture, the existence of the so-called slush phase 10 can be naturally explained. Recent experiments 11,12,13,14,15 for YBaCuO seem to support this scenario. On the other hand, experimental data 16,17,18 for BSCCO strongly argue in favor of a different scenario which was implied, e.g., in the Refs.…”

Section: −2 Amentioning

confidence: 93%

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Effect of pinning on the vortex-lattice melting line in type-II superconductors

Mikitik

Brandt

2003

Phys. Rev. B

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The vortex-lattice melting line in three-dimensional type-II superconductors with pinning is derived by equating the free energies of the vortex system in the solid and liquid phases. We account for the elastic and pinning energies and the entropy change that originates from the disappearance of the phonon shear modes in the liquid. The pinning is assumed to be caused by point defects and to be not too strong so that the melting line lies inside the so-called bundle-pinning region. We show that the derived equation for the melting line is equivalent to some Lindemann criterion, which however differs from that used previously. Estimating the effect of pinning on the entropy jump at melting, we find the upper critical point of the melting line from the condition that this jump vanishes. We also consider the H-T phase diagrams of type-II superconductors for different strengths and types of pinning and analyze the two recently discussed scenarios how the melting line and the order-disorder line merge.

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Section: −2 Amentioning

confidence: 93%

“…Note that for inequalities (11) to be fulfilled in a sufficiently wide temperature interval, the Ginzburg number should not be too small. In the opposite limiting case,…”

Section: A Lindemann Criterionmentioning

confidence: 99%

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Mikitik

Brandt

2003

Phys. Rev. B

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“…Therefore, the second magnetization peak feature [9,15,16,[18][19][20][21][22][23][24] observed in the M (H) curves (Fig. 4) reflects an anomalous modulation in j c (H), which, in turn, could be indicative of an order-disorder transition in the vortex matter.…”

Section: Isothermal M-h Scansmentioning

confidence: 99%

“…Hence, an anomalous increase in j c (H, T ) (as in PE phenomenon) signifies a shrinkage in V c , which in turn, amounts to an order-disorder transformation of the vortex matter. Somewhat analogous to the PE, there is another anomalous feature occurring deep inside the mixed state (well below H c2 ), called the second magnetization peak (SMP) [9,15,16,[18][19][20][21][22][23][24] which also imprints as a non-monotonic behavior of j c (H). The SMP feature has been well studied in high T c cuprate superconductors, YBa 2 Cu 3 O 7 (YBCO) [9], Bi 2 Sr 2 CaCu 2 O 8 (BSCCO) [20,21] and another oxide superconductor, (Ba,K)BiO system [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Dual role of an ac driving force and the underlying two distinct order–disorder transitions in the vortex phase diagram of Ca 3 Ir 4 Sn 13

Kumar¹,

Singh²,

Thamizhavel³

et al. 2014

Physica C: Superconductivity and its Applications

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We present distinct demarcation of the Bragg glass (BG) to multi-domain vortex glass (VG) transition line and the eventual amorphization of the VG phase in a weakly pinned single crystal of the superconducting compound Ca3Ir4Sn13 on the basis of comprehension of the different yields about the second magnetization peak (SMP) anomaly in the dc magnetization and the corresponding anomalous feature in the ac susceptibility measurements. The shaking by a small ac magnetic field, inevitably present in the ac susceptibility measurements, is seen to result in contrasting responses in two different portions of the fieldtemperature (H, T) phase space of the multi-domain VG. In one of the portions, embracing the BG to VG transition across the onset of the SMP anomaly, the ac drive is surprisingly seen to assist the transformation of the well ordered BG phase to a lesser ordered VG phase. The BG phase exists as a superheated state over a small portion of the VG space and this attests to the first order nature of the BG to VG transition.

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“…Owing to the possibility of a sudden proliferation of dislocations on progressively increasing the magnetic field at a constant temperature, the quasi -long range ordered BG phase is anticipated [1,2] to transform first into a multi -domain (partially disordered) vortex glass (VG) phase. Such a transition usually reflects as a second peak in (isothermal) magnetization (M -H) loops, termed as the second magnetization peak (SMP) anomaly [5][6][7][8][9][10][11]. Thereafter, at elevated fields closer to the upper critical field (H c2 (T )), there occurs another anomaly, known as the quintessential peak effect (PE) phenomenon [3,9,10,[12][13][14][15][16][17][18] in field/temperature variation in critical current density, j c (H, T ).…”

Section: Introductionmentioning

confidence: 99%

Unveiling of Bragg glass to vortex glass transition by an ac driving force in a single crystal of Yb₃Rh₄Sn₁₃

Kumar

Singh

Thamizhavel

et al. 2015

Supercond. Sci. Technol.

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We present here some striking discrepancies in the results of ac and dc magnetization measurements performed in a single crystal of low Tc superconductor, Yb3Rh4Sn13. Fingerprint of a transition from an ordered vortex lattice a la Bragg glass (BG) phase to a partially-disordered vortex glass (VG) like phase gets unearthed under the influence of an ac driving force present inevitably in the isothermal ac susceptibility (χ ′ (H)) measurements. In contrast to its well -known effect of improving the state of spatial order in the vortex matter, the ac drive is surprisingly found to promote disorder by assisting the BG to VG transition to occur at a lower field value in this compound. On the other hand, the isothermal dc magnetization (M -H) scans, devoid of such a driving force, do not reveal this transition; they instead yield signature of another order-disorder transition at elevated fields, viz., peak effect (PE), located substantially above the BG to VG transition observed in χ ′ (H) runs. Further, the evolution of PE feature with increasing field as observed in isofield ac susceptibility (χ ′ (T )) plots indicates emergence of an ordered vortex configuration (BG) from a disordered phase above a certain field, H * (∼ 4 kOe). Below H * , the vortex matter created via field -cooling (FC) is found to be better spatially ordered than that prepared in zero field -cooled (ZFC) mode. This is contrary to the usual behavior anticipated near the high-field order-disorder transition (PE) wherein a FC state is supposed to be a supercooled disordered phase and the ZFC state is comparatively better ordered.

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Study of the multicritical point in the vortex phase diagram(H‖c)of a weakly pinned crystal ofYBa2

Cited by 36 publications

References 26 publications

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Dual role of an ac driving force and the underlying two distinct order–disorder transitions in the vortex phase diagram of Ca 3 Ir 4 Sn 13

Unveiling of Bragg glass to vortex glass transition by an ac driving force in a single crystal of Yb₃Rh₄Sn₁₃

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Study of the multicritical point in the vortex phase diagram(H‖c)of a weakly pinned crystal ofYBa2

Cited by 36 publications

References 26 publications

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Effect of pinning on the vortex-lattice melting line in type-II superconductors

Dual role of an ac driving force and the underlying two distinct order–disorder transitions in the vortex phase diagram of Ca 3 Ir 4 Sn 13

Unveiling of Bragg glass to vortex glass transition by an ac driving force in a single crystal of Yb3Rh4Sn13

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Unveiling of Bragg glass to vortex glass transition by an ac driving force in a single crystal of Yb₃Rh₄Sn₁₃