Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-12-07
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, including 9 figures
Scientific paper
10.1088/0953-8984/13/12/309
The magnetic ordering temperature of some rare earth based heavy fermion compounds is strongly pressure-dependent and can be completely suppressed at a critical pressure, p$_c$, making way for novel correlated electron states close to this quantum critical point. We have studied the clean heavy fermion antiferromagnets CePd$_2$Si$_2$ and CeIn$_3$ in a series of resistivity measurements at high pressures up to 3.2 GPa and down to temperatures in the mK region. In both materials, superconductivity appears in a small window of a few tenths of a GPa on either side of p$_c$. We present detailed measurements of the superconducting and magnetic temperature-pressure phase diagram, which indicate that superconductivity in these materials is enhanced, rather than suppressed, by the closeness to magnetic order.
Freye D. M.
Grosche Malte F.
Julian Stephen R.
Lonzarich Gilbert G.
Mathur Neil D.
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