Phase transition in the vortex structure of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} HTSCs in weak magnetic fields
Journal Article
·
· Journal of Experimental and Theoretical Physics
This study aims at establishing the interrelation between the current-carrying capacity and peculiarities of magnetoresistance of granular YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} HTSCs (T{sub c} = 92.5 K). The transverse magnetoresistance of several batches of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} HTSC samples with noticeably different values of critical supercurrent density j{sub c} is measured in magnetic fields H{sub ext} up to H{sub ext}{sup max} {approx} 500 Oe in a wide range of transport currents (5 mA {<=} I {<=} 1600 mA) at T = 77.4 K. Samples with relatively high values of j{sub c} (H{sub ext} = 0) {>=} 100 A/cm{sup 2} do not exhibit any anomalies in their field dependences. Magnetoresistance jumps {delta}{rho}{sub BG-VG}/{rho}{sub 273K} are observed for samples with low values of j{sub c} {>=} 20 A/cm{sup 2} in fields H{sub BG-VG} {approx} 200-260 Oe. The width {delta}H{sub BG-VG} of the anomalous resistance region increases upon an increase in I. The magnetoresistance jumps decrease with increasing I in increasing field H{sub ext}(0 {sup {yields}} H{sub ext}{sup max}) and increase in decreasing field H{sub ext}(H{sub ext}{sup max} {sup {yields}} 0). It is found that these peculiarities of the field dependences of magnetoresistance are associated with a first-order phase transition (in magnetic field) in the vortex structure of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} HTSCs of the Bragg glass-vortex glass type.
- OSTI ID:
- 21241893
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 5 Vol. 107; ISSN JTPHES; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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