Absence of Colossal Magnetoresistance in the Oxypnictide PrMnAsO0.95F0.05

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Abstract

We have recently reported a new mechanism of colossal magnetoresistance (CMR) in electron doped manganese oxypnictides NdMnAsO1–xFx. Magnetoresistances of up to −95% at 3 K have been observed. Here we show that upon replacing Nd for Pr, the CMR is surprisingly no longer present. Instead a sizable negative magnetoresistance is observed for PrMnAsO0.95F0.05 below 35 K (MR7T (12 K) = −13.4% for PrMnAsO0.95F0.05). A detailed neutron and synchrotron X-ray diffraction study of PrMnAsO0.95F0.05 has been performed, which shows that a structural transition, Ts, occurs at 35 K from tetragonal P4/nmm to orthorhombic Pmmn symmetry. The structural transition is driven by the Pr 4f electrons degrees of freedom. The sizable −MR observed below the transition most likely arises due to a reduction in magnetic and/or multipolar scattering upon application of a magnetic field.
Original languageEnglish
Pages (from-to)2536-2542
Number of pages7
JournalInorganic Chemistry
Volume54
Issue number6
Early online date25 Feb 2015
DOIs
Publication statusPublished - 2015

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Colossal magnetoresistance
Magnetoresistance
Electrons
Manganese
Electron transitions
Synchrotrons
Neutrons
Scattering
Magnetic fields
X ray diffraction
manganese
synchrotrons
electrons
degrees of freedom
neutrons
symmetry
scattering
diffraction
magnetic fields
x rays

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Absence of Colossal Magnetoresistance in the Oxypnictide PrMnAsO0.95F0.05. / Wildman, Eve J; Sher, Falak; McLaughlin, Abbie.

In: Inorganic Chemistry, Vol. 54, No. 6, 2015, p. 2536-2542.

Research output: Contribution to journalArticle

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title = "Absence of Colossal Magnetoresistance in the Oxypnictide PrMnAsO0.95F0.05",
abstract = "We have recently reported a new mechanism of colossal magnetoresistance (CMR) in electron doped manganese oxypnictides NdMnAsO1–xFx. Magnetoresistances of up to −95{\%} at 3 K have been observed. Here we show that upon replacing Nd for Pr, the CMR is surprisingly no longer present. Instead a sizable negative magnetoresistance is observed for PrMnAsO0.95F0.05 below 35 K (MR7T (12 K) = −13.4{\%} for PrMnAsO0.95F0.05). A detailed neutron and synchrotron X-ray diffraction study of PrMnAsO0.95F0.05 has been performed, which shows that a structural transition, Ts, occurs at 35 K from tetragonal P4/nmm to orthorhombic Pmmn symmetry. The structural transition is driven by the Pr 4f electrons degrees of freedom. The sizable −MR observed below the transition most likely arises due to a reduction in magnetic and/or multipolar scattering upon application of a magnetic field.",
author = "Wildman, {Eve J} and Falak Sher and Abbie McLaughlin",
note = "ACKNOWLEDGMENTS This research is supported by the EPSRC (Research Grant EP/ L002493/1). We also acknowledge STFC-GB for provision of beamtime at ILL and ESRF.",
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T1 - Absence of Colossal Magnetoresistance in the Oxypnictide PrMnAsO0.95F0.05

AU - Wildman, Eve J

AU - Sher, Falak

AU - McLaughlin, Abbie

N1 - ACKNOWLEDGMENTS This research is supported by the EPSRC (Research Grant EP/ L002493/1). We also acknowledge STFC-GB for provision of beamtime at ILL and ESRF.

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N2 - We have recently reported a new mechanism of colossal magnetoresistance (CMR) in electron doped manganese oxypnictides NdMnAsO1–xFx. Magnetoresistances of up to −95% at 3 K have been observed. Here we show that upon replacing Nd for Pr, the CMR is surprisingly no longer present. Instead a sizable negative magnetoresistance is observed for PrMnAsO0.95F0.05 below 35 K (MR7T (12 K) = −13.4% for PrMnAsO0.95F0.05). A detailed neutron and synchrotron X-ray diffraction study of PrMnAsO0.95F0.05 has been performed, which shows that a structural transition, Ts, occurs at 35 K from tetragonal P4/nmm to orthorhombic Pmmn symmetry. The structural transition is driven by the Pr 4f electrons degrees of freedom. The sizable −MR observed below the transition most likely arises due to a reduction in magnetic and/or multipolar scattering upon application of a magnetic field.

AB - We have recently reported a new mechanism of colossal magnetoresistance (CMR) in electron doped manganese oxypnictides NdMnAsO1–xFx. Magnetoresistances of up to −95% at 3 K have been observed. Here we show that upon replacing Nd for Pr, the CMR is surprisingly no longer present. Instead a sizable negative magnetoresistance is observed for PrMnAsO0.95F0.05 below 35 K (MR7T (12 K) = −13.4% for PrMnAsO0.95F0.05). A detailed neutron and synchrotron X-ray diffraction study of PrMnAsO0.95F0.05 has been performed, which shows that a structural transition, Ts, occurs at 35 K from tetragonal P4/nmm to orthorhombic Pmmn symmetry. The structural transition is driven by the Pr 4f electrons degrees of freedom. The sizable −MR observed below the transition most likely arises due to a reduction in magnetic and/or multipolar scattering upon application of a magnetic field.

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JO - Inorganic Chemistry

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SN - 0020-1669

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