Effects of pressure on the electrical resistance of certain metals

Behavior of the Elements at High Pressures

“…Resistanc~ measurements by others [20,130,343,360,421] have not revealed any discontinuity in the vicinity of the Ba(II-III) transition. Bridgman's volume work [70] also fails to show a tra.nsition in the 70-85 kbar region.…”

“…The R(p) studies of Stager and Drickamer [345] indicate a phase transition at about 122-130 kbar at RT. Stromberg and Stephens [360] investigated R(p) to about 130 kbar without obseTving the rapid rise in resistance characteristic of the transition. Mc Whan, et al [282] examined Eu to 130 ± 15 kbar with X-rays and reported no structure change.…”

Physical Metallurgy

“…Resistance measurements at high pressure by Stromberg and Stephens (1964) indicate that the hep modification exists up to 140 kbar. A face-centred cubic, fee, structure was reported in the 1930s (Meisel, 1939) but scientists working with much purer materials since then have never confirmed the existence of this polymorphic modification.…”

“…High pressure measurements at 25°C have been made by Stromberg and Stephens (1964) up to 140 kbar. They found that the resistivity increases by 4 % up to about 60 kbar and then it slowly decreases from this maximum having a value 1% smaller at 140 kbar.…”

Superconductivity at high pressures

“…Модификация Ш 11 является «мягким» сверхпроводником со значением dTjdp --ό,Δ χ χ 10" 5 град/бар и с кривой критических полей, близкой к кривой крити-ческих полей белого олова. Кристаллическая модификация Bi III пере-ходит в сверхпроводящее состояние при температуре Т с ~ 7,1 К и обла-дает очень малым отрицательным значением dTjdp 50 была обнаружена сверхпроводимость кристал-лических модификаций фосфора, возникающих при давлениях выше 160 кбар. Одна из модификаций фосфора, возникающая при давлениях -160-200 кбар, обнаруживает сверхпроводимость с Т с = 5,8° К (при давлении -180 кбар) и значением dHJdT = 1100 э/град.…”