2001
DOI: 10.1103/physrevlett.87.017006
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History Effects and Phase Diagram near the Lower Critical Point inYBa2Cu3O7

Abstract: Using a sensitive torque magnetometer we have studied magnetization curves for untwinned overdoped YBa2Cu3O7 single crystals in fields of up to 28 T. We demonstrate the existence of history effects below the lower critical point and provide a full demarcation of the Bragg-glass phase. A pronounced symmetry is observed in the behavior of the phase lines, irreversible magnetization, and value of the magnetization jump near both critical points.

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Cited by 14 publications
(10 citation statements)
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“…6,7 Measurements on CeRu 2 have supported the prediction that supercooling by reducing H reduces the effective free energy barrier seen by the metastable state, and supercooling is best achieved by reducing T in constant H, i.e., by field cooling. Signatures of supercooling across a FOT in vortex matter have also been reported in various other superconductors such as YBCO, 8,9 NbSe 2 , 10 BSCCO, 11 Nb, 12 V 3 Si, 13,14 etc. Measurements on V 3 Si ͑Ref.…”
Section: Introductionsupporting
confidence: 56%
“…6,7 Measurements on CeRu 2 have supported the prediction that supercooling by reducing H reduces the effective free energy barrier seen by the metastable state, and supercooling is best achieved by reducing T in constant H, i.e., by field cooling. Signatures of supercooling across a FOT in vortex matter have also been reported in various other superconductors such as YBCO, 8,9 NbSe 2 , 10 BSCCO, 11 Nb, 12 V 3 Si, 13,14 etc. Measurements on V 3 Si ͑Ref.…”
Section: Introductionsupporting
confidence: 56%
“…The properties of flux lines in high temperature superconductors in a magnetic field have been under theoretical and experimental investigation for many years but surprises continue to appear. The first-order transition line observed in experiments [1][2][3][4] well below the upper critical field H c2 (T ) is usually interpreted as a melting line of a vortex lattice into a vortex liquid. For Y-Ba-Cu-O (YBCO) superconductors, the first-order nature of the transition disappears at critical points in both high [1,2] and low [3,4] magnetic fields.…”
Section: Introductionmentioning
confidence: 99%
“…The first-order transition line observed in experiments [1][2][3][4] well below the upper critical field H c2 (T ) is usually interpreted as a melting line of a vortex lattice into a vortex liquid. For Y-Ba-Cu-O (YBCO) superconductors, the first-order nature of the transition disappears at critical points in both high [1,2] and low [3,4] magnetic fields. Unlike the upper critical point, which is usually attributed to the effect of disorder, the value of the lower critical field seems to be determined by the oxygen content of the sample [4].…”
Section: Introductionmentioning
confidence: 99%
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“…The same non-monotonic character of the transition line between two kinds of vortex solids has been reported earlier for YBa 2 Cu 3 O 7−δ (YBCO) single crystals 5,6 . In addition the presence of metastability has also been highlighted across this phase transition 6,7 . We extend this study to argue that the vortex solid-solid transition line in YBCO is also a first order transition line, and there exists a situation of "ordering by heating" in a certain B-T window of YBCO as well.…”
mentioning
confidence: 96%