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

doi:10.1103/PhysRevB.71.014430

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

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

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 language	English
Number of pages	4
Journal	Physical Review. B, Condensed matter and materials physics
Volume	71
DOIs	https://doi.org/10.1103/PhysRevB.71.014430
Publication status	Published - Jan 2005

Keywords

MANGANITES
NMR
PR1-XCAXMNO3
STATE
FIELD

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10.1103/PhysRevB.71.014430

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@article{1019b42f9b164b35802a38c9ce916dba,

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

abstract = "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.",

keywords = "MANGANITES, NMR, PR1-XCAXMNO3, STATE, FIELD",

author = "Oates, {C J} and C Kapusta and M Sikora and Riedi, {P C} and C Martin and C Yaicle and A Maignan and Ibarra, {M R}",

year = "2005",

month = jan,

doi = "10.1103/PhysRevB.71.014430",

language = "English",

volume = "71",

journal = "Physical Review. B, Condensed matter and materials physics",

issn = "1098-0121",

publisher = "American Physical Society",

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TY - JOUR

T1 - Nuclear magnetic resonance study of insulator-metal transitions in (Pr,Ca)MnO3

AU - Oates, C J

AU - Kapusta, C

AU - Sikora, M

AU - Riedi, P C

AU - Martin, C

AU - Yaicle, C

AU - Maignan, A

AU - Ibarra, M R

PY - 2005/1

Y1 - 2005/1

N2 - 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.

AB - 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.

KW - MANGANITES

KW - NMR

KW - PR1-XCAXMNO3

KW - STATE

KW - FIELD

U2 - 10.1103/PhysRevB.71.014430

DO - 10.1103/PhysRevB.71.014430

M3 - Article

SN - 1098-0121

VL - 71

JO - Physical Review. B, Condensed matter and materials physics

JF - Physical Review. B, Condensed matter and materials physics

ER -

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

Abstract

Keywords

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