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Dynamic and thermodynamic magnetization experiments on heavy-ion irradiatedsingle crystalline Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta} are correlated in order toclarify the nature of the mixed state phase diagram. It is shown that whereasthe entropy contribution to the free energy in the London regime plays a minorrole in unirradiated crystals and irradiated crystals at fields close to orabove the matching field $B_{\phi}$, it becomes very important at low fields inirradiated crystals with high $B_{\phi}$. The direct determination of theentropy contribution to the free energy from the reversible magnetizationallows one to determine not only the correct values of the pinning energy, butalso to extract quite detailed information on pancake vortex alignment. Thecharacteristic field $H_{int} \sim {1/6} B_{\phi}$ at which intervortexrepulsion begins to determine the vortex arrangement and the reversiblemagnetization is shown to coincide with a sharp increase in the irreversibilityfield $H_{irr}(T)$ and with the recoupling transition found in Josephson PlasmaResonance. Above $H_{int}$, the repulsive interaction between vortices causeboth the vortex mobility to decrease and pancake alignement to increase. Athigher fields $\gtrsim {1/3}B_{\phi}\gg B_{c1}$, free vortices outnumber thosethat are trapped on a columnar defect. This causes the decrease of c-axisresistivity and a second crossover of the irreversibility field, to a regimewhere it is determined by plastic creep.Comment: 12 Pages, 8 Figure

physical review. b, condensed matter

Entropy, vortex interactions, and the phase diagram of heavy-ion-irradiated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CaCu</…

Entropy, vortex interactions, and the phase diagram of heavy-ion-irradiatedBi2Sr2CaCu