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 language | English |
|---|---|
| Pages (from-to) | 2536-2542 |
| Number of pages | 7 |
| Journal | Inorganic Chemistry |
| Volume | 54 |
| Issue number | 6 |
| Early online date | 25 Feb 2015 |
| DOIs | |
| Publication status | Published - 2015 |
Bibliographical note
ACKNOWLEDGMENTSThis 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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X-ray diffraction data of LnMnAsO1-xFx and NdMn1-xCoxAsO1-xFx samples
McLaughlin, A. (Creator), University of Aberdeen, 15 May 2015
DOI: 10.20392/a5c38a3a-2c45-41a5-9362-d4d938b52084
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Abbie McLaughlin
- School of Natural & Computing Sciences, Chemistry - Personal Chair
- Centre for Energy Transition
Person: Academic