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Sarkar, Sreemoyee; Pal, D.; Banerjee, S. S.; Ramakrishnan, S.; Grover, A. K.; Tomy, C. V.; Ravikumar, G.; Mishra, Prerna; Sahni, V. C.; Balakrishnan, G.; Paul, D. McK.; Bhattacharya, S.

doi:10.1103/physrevb.61.12394

Cited by 31 publications

(46 citation statements)

References 53 publications

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“…immediately observe the presence of two discontinuous jumps at temperatures marked as onset (T on p ) and the peak temperature (T p ) of the PE phenomenon in the χ′(T ) data. The ordered vortex lattice prepared in a field of 10 kOe (after zero field cooling) undergoes a stepwise disordering across the PE region [8]. It has been pointed out earlier [8] that the thermomagnetic history dependence in χ ′ (T ) response at H = 10 kOe becomes indiscernible a little above T p .…”

Section: Resultsmentioning

confidence: 99%

“…The ordered vortex lattice prepared in a field of 10 kOe (after zero field cooling) undergoes a stepwise disordering across the PE region [8]. It has been pointed out earlier [8] that the thermomagnetic history dependence in χ ′ (T ) response at H = 10 kOe becomes indiscernible a little above T p . The frequency dependence in χ ′ (T ) response becomes immeasurable (panel (b) of figure 2) at the limiting temperature T * (> T p ).…”

Section: Resultsmentioning

confidence: 99%

“…We had earlier obtained [8] magnetization hysteresis data in this sample using a commercial SQUID magnetometer (Quantum Design Inc., U.S.A., Model MPMS5) and employing the procedure of the half scan, as enunciated by Ravikumar et al [29,30], to overcome a problem originating from the magnetic field inhomogeneity along the scan length.…”

Section: Methodsmentioning

confidence: 99%

“…However, the latter studies [8,9,10,11] in single crystals of Ca 3 Rh 4 Sn 13 and Yb 3 Rh 4 Sn 13 revealed the occurrence of PE in isofield ac susceptibility (χ ′ (T )) scans in fields down to about 3 kOe and reduced temperature T /T c (0) value upto 0.94. The χ ′ (T ) scans in these compounds also revealed [8,10,11] the occurrence of notion of stepwise disordering of the ordered vortex state across the temperature interval extending from the onset position of the PE upto the sharp commencement of depinning process in the bulk of the sample. Prior to this work, such a behavior had been reported in weakly pinned crystals of the systems like, 2H-NbSe 2 and the cubic (C15) CeRu 2 [12].…”

Section: Introductionmentioning

confidence: 99%

“…The notion of the phase coexistence across the first order transition(s) offers an interesting possibility of modulation in the phase coexistence characteristic across the SMP and the PE anomalies in isothermal scans in the context of our sample of Ca 3 Rh 4 Sn 13 [8,9,11]. Park et al [24] have recently drawn attention to the presence of multi-critical point in the BG phase in a single crystal of Nb, which had earlier been studied by Ling et al [23].…”

Section: Introductionmentioning

confidence: 99%

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Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

et al. 2006

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New experimental data are presented on the scan rate dependence of the magnetization hysteresis width ∆M (H) (∝ critical current density J c (H)) in isothermal M − H scans in a weakly pinned single crystal of Ca 3 Rh 4 Sn 13 , which displays second magnetization peak (SMP) anomaly as distinct from the peak effect (PE). We observe an interesting modulation in the field dependence of a parameter which purports to measure the dynamical annealing of the disordered bundles of vortices injected through the sample edges towards the destined equilibrium vortex state at a given H.These data, in conjunction with the earlier observations made while studying the thermomagnetic history dependence in J c (H) in the tracing of the minor hysteresis loops, imply that the partially disordered state heals towards the more ordered state between the peak field of the SMP anomaly and the onset field of the PE. The vortex phase diagram in the given crystal of Ca 3 Rh 4 Sn 13 has been updated in the context of the notion of the phase coexistence of the ordered and disordered regions between the onset field of the SMP anomaly and the spinodal line located just prior to the irreversibility line. A multi-critical point and a critical point in the (H, T ) region of the Bragg glass phase have been marked in this phase diagram and the observed behaviour is discussed in the light of recent data on multi-critical point in the vortex phase diagram in a single crystal of Nb.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

et al. 2006

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Vortex phase diagram studies in the weakly pinned single crystals of YNi2B2C and LuNi2B2C

et al. 2006

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Effect of pinning and driving force on the metastability effects in weakly pinned superconductors and the determination of spinodal line pertaining to order—disorder transition

et al. 2006

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We explore the effect of varying drive on metastability features exhibited by the vortex matter in single crystals of 2H-NbSe 2 and CeRu 2 with varying degree of random pinning. The metastable nature of vortex matter is reflected in the path dependence of the critical current density, which in turn is probed in a contact-less way via ac-susceptibility measurements. The sinusoidal ac magnetic field applied during ac susceptibility measurements appears to generate a driving force on the vortex matter. In a nascent pinned single crystal of 2H-NbSe 2 , where the peak effect (PE) pertaining to the order-disorder phenomenon is a sharp first order like transition, the supercooling feature below the peak temperature is easily wiped out by the reorganization caused by the ac driving force. In this paper, we elucidate the interplay between the drive and the pinning which can conspire to make the path dependent ac-susceptibility response of different metastable vortex states appear identical. An optimal balance between the pinning and driving force is needed to view the metastability effects in typically weakly pinned specimen of low temperature superconductors. As one uses samples with larger pinning in order to differentiate the response of different metastable vortex states, one encounters a new phenomena, viz., the second magnetization peak (SMP) anomaly prior to the PE. Supercooling/superheating can occur across both the PE and the SMP anomaly and both of these are known to display non-linear characteristic as well. Interplay between the path dependence in the critical current density and the non-linearity in the electromagnetic response determine the metastability effects seen in first and the third harmonic response of the ac susceptibility across the temperature regions of the SMP and the PE. The limiting temperature above which metastability effects cease can be conveniently located in the third harmonic data, and the observed behavior can be rationalized within the Beans Critical State model. A vortex phase diagram showing the different vortex phases for a typically weakly pinned specimen has been constructed via the ac susceptibility data in a crystal of 2H-NbSe 2 which shows the SMP and the PE anomalies. The phase space of coexisting weaker and stronger pinned regions has been identified. It can be bifurcated into two parts, where the order and disorder dominate, respectively. The former part continuously connects to the reentrant disordered vortex phase pertaining to the small bundle pinning regime, where the vortices are far apart, interaction effects are weak and the polycrystalline form of flux line lattice prevails.

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Stepwise amorphization of the flux-line lattice inCa3Rh4Sn13

Cited by 31 publications

References 53 publications

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

Critical points in the Bragg glass phase of a weakly pinned crystal of Ca3Rh4Sn13

Vortex phase diagram studies in the weakly pinned single crystals of YNi2B2C and LuNi2B2C

Effect of pinning and driving force on the metastability effects in weakly pinned superconductors and the determination of spinodal line pertaining to order—disorder transition

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