TY - JOUR
T1 - Pressure-tuned insulator to metal transition in Eu 2Ir 2O 7
AU - Tafti, F. F.
AU - Ishikawa, J. J.
AU - McCollam, A.
AU - Nakatsuji, S.
AU - Julian, S. R.
PY - 2012/5/3
Y1 - 2012/5/3
N2 - We have studied the effect of pressure on the pyrochlore iridate Eu 2Ir 2O 7, which, at ambient pressure, has a thermally driven insulator to metal transition at T MI∼120K. As a function of pressure, the insulating gap closes, apparently continuously near P∼6GPa. However, rather than T MI going to zero as expected, the insulating ground state crosses over to a metallic state with a negative temperature coefficient of resistivity, suggesting that these ground states have a novel character. The high-temperature state also crosses over near 6 GPa from an incoherent to a conventional metal, implying that there is a connection between the high- and the low-temperature states.
AB - We have studied the effect of pressure on the pyrochlore iridate Eu 2Ir 2O 7, which, at ambient pressure, has a thermally driven insulator to metal transition at T MI∼120K. As a function of pressure, the insulating gap closes, apparently continuously near P∼6GPa. However, rather than T MI going to zero as expected, the insulating ground state crosses over to a metallic state with a negative temperature coefficient of resistivity, suggesting that these ground states have a novel character. The high-temperature state also crosses over near 6 GPa from an incoherent to a conventional metal, implying that there is a connection between the high- and the low-temperature states.
UR - https://www.scopus.com/pages/publications/84861582700
U2 - 10.1103/PhysRevB.85.205104
DO - 10.1103/PhysRevB.85.205104
M3 - Article
AN - SCOPUS:84861582700
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 20
M1 - 205104
ER -