Pressure-temperature phase diagram of charge ordering in Nd1/2Sr1/2MnO3

• Published in: Europhysics letters Vol. 92; no. 4; p. 47001
• Main Authors: Maselli, P, Nicoletti, D, Nucara, A, Vitucci, F. M, Irizawa, A, Shoji, K, Nanba, T, Calvani, P
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01-11-2010; EPS, SIF, EDP Sciences and IOP Publishing
• Subjects: 62.50.-p; 71.30.+h; 78.30.-j
• ISSN: 0295-5075; 1286-4854
• DOI: 10.1209/0295-5075/92/47001

We observe how the charge-ordering (CO) temperature TCO of Nd1/2Sr1/2MnO3 decreases with the external pressure p from 160 K at p=0 down to 30 K at p≃ 4.5 GPa, by measuring the values p, T where the far-infrared spectral weight of the metallic phase is fully recovered. We thus determine the (p, T) phase diagram of CO in that manganite. We also find that the parameter d(lnTCO)/dp which describes this metallization from the CO phase is equal and opposite to the quantity d(lnTc)/dp which governs the metallization of the paramagnetic state at comparable Curie temperatures Tc, in similar manganites at half-doping.