Influence of pressure up to 2.0 GPa on magnetic ordering in the system GdBa2Cu3O7–<i>δ</i> (<i>δ</i> ∼ 1)
V. DyakonovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskG. G. LevchenkoPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskV. MarkovichPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskA. OleinikPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskP. I. PolyakovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskI. FitaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk
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The influence of a high hydrostatic pressure (up to 2.0 GPa) on the Néel temperature and the H–T phase diagram of GdBa2Cu3O7–δ) (δ ∼ 1) is studied. The value of TN is found to increase with pressure at the rate dTN/dP = 0.1 K/GPa. It is shown that the spin–flop transition field Hc1(0) is practically independent of pressure, while the spin–flip transition field Hc2(0) increases by 2.5 kOe at P = 2.0 GPa as compared to its value at P = 0. This increase is attributed to an increase in the exchange field and a decrease in the anisotropy field under a uniform compression.
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