Nuclear magnetic resonance study of insulator-metal transitions in (Pr,Ca)MnO3

C J Oates, C Kapusta, M Sikora, P C Riedi, C Martin, C Yaicle, A Maignan, M R Ibarra

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3 Citations (Scopus)


An NMR study of polycrystalline Pr0.5Ca0.5Mn1-xGaxO3 (x=0 and 0.03) and Pr0.67Ca0.33MnO3 at 3 K is presented. Zero-field spin-echo spectra of the Ga-doped compound consist of an overlapping Ga-69,Ga-71 signal at 74 MHz (hyperfine field of 5.3 T) and a Mn-55 double-exchange (DE) line at 375 MHz (35.5 T). Measurements in an applied field show a steplike increase in the DE line intensity, which corresponds to an increase of the amount of the ferromagnetic metallic phase. This coincides with a steplike feature in the bulk magnetization measurements. The effect is similar to that in the previous field-dependent Mn-55 NMR measurements of Pr0.67Ca0.33MnO3. The insulator - metal transition for Pr0.67Ca0.33MnO3, at ambient pressure, occurs at fields greater than 5 T; however, at 1.1 GPa, the DE line corresponding to the ferromagnetic metallic phase is already present at zero field.

Original languageEnglish
Number of pages4
JournalPhysical Review. B, Condensed matter and materials physics
Publication statusPublished - Jan 2005


  • NMR


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