TY  - JOUR
AU  - Puri, A.
AU  - Marcelli, A.
AU  - Poccia, N.
AU  - Ricci, A.
AU  - Zeitler, U.
AU  - Di Gioacchino, D.
TI  - Vortex Dynamics and Irreversibility Line in FeSe<sub>0.25</sub>Te<sub>0.75</sub>
JO  - Physics procedia
VL  - 67
SN  - 1875-3892
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - PUBDB-2015-05518
SP  - 890 - 895
PY  - 2015
AB  - AC multi-harmonic susceptibility measurements were performed in the FeSe<sub>0.25</sub>Te<sub>0.75</sub> superconductor. A large frequency-magnetic field-temperature (f-H-T) region of the superconducting phase diagram was mapped under a wide range of the DC magnetic field. In particular the irreversibility line was accurately drawn up to 20 T as a function of both T and f. The frequency dependence of the irreversibility line was analyzed using the 3D vortex glass model, well describing the experimental behavior up to high magnetic field. The data evidence the evolution in time of the metastable critical state in a final stable vortex glass phase by decreasing the frequency. Moreover, from the Werthamer, Helfand and Hohenberg theory we estimated the upper critical field μ<sub>0</sub>Hc<sub>2</sub>(0 K)   62 T. The observed 3D flux-pinning response points out that this system is suitable for carrying quite high critical currents.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000380607500148
DO  - DOI:10.1016/j.phpro.2015.06.150
UR  - https://bib-pubdb1.desy.de/record/291688
ER  -