@article {37111,
	title = {Magnetic phase diagram in a HgBa2CuO4+delta single crystal},
	journal = {PHYSICA C},
	volume = {317},
	year = {1999},
	month = {1999},
	pages = {658 - 660},
	abstract = {The irreversibility magnetic field H-irr(T) decreases exponentially in the temperature range 20 less than or equal to T less than or equal to 88 K. At T* approximate to 88 K, the H-irr(T) curve changes slope abruptly and a new mechanism controls the irreversibility up to T-c. The hysteresis loops measurements (H parallel to c) show a second peak for 5 less than or equal to T less than or equal to 50 K. Relaxation measurements performed in the region of the second peak show, at constant temperature, that effective activation energy U-o(H) first increases up to H-sp{\textquoteright}(T) and then decreases for H > H-sp{\textquoteright}(T). H-sp{\textquoteright}(T) is located lower than the field H-sp(T) deduced from the hysteresis loops. (C) 1999 Elsevier Science B.V. All rights reserved.},
	isbn = {0921-4534},
	author = {Stamopoulos, D. and Pissas, M. and Moraitakis, E. and Kallias, G. and Niarchos, D. and Charalambous, M.}
}
