Abstract
We report a Raman scattering study of the pressure-induced collapse of the Mott-like phases of [Formula presented] ([Formula presented]) and [Formula presented] ([Formula presented]). The pressure dependence of the phonon and two-magnon excitations in these materials indicate (i) a [Formula presented] pressure-induced collapse of the antiferromagnetic (AF) insulating phase above [Formula presented] in [Formula presented] and [Formula presented] in [Formula presented], (ii) a remarkable insensitivity of the exchange interaction to pressure in both systems, and (iii) evidence for persistent AF correlations above the critical pressure of [Formula presented], suggestive of phase separation involving AF insulator and ferromagnetic metal phases.
Original language | English (US) |
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Journal | Physical review letters |
Volume | 89 |
Issue number | 22 |
DOIs | |
State | Published - 2002 |
ASJC Scopus subject areas
- General Physics and Astronomy