A high pressure neutron study of colossal magnetoresistant NdMnAsO0.95F0.05

E. J. Wildman; M. G. Tucker; A. C. McLaughlin

doi:10.1088/0953-8984/27/11/116001

A high pressure neutron study of colossal magnetoresistant NdMnAsO_0.95F_0.05

E. J. Wildman, M. G. Tucker, A. C. McLaughlin

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

2 Scopus citations

Abstract

A high pressure neutron diffraction study of the oxypnictide NdMnAsO_0.95F_0.05 has been performed at temperatures of 290-383K and pressures up to 8.59GPa. The results demonstrate that the antiferromagnetic order of the Mn spins is robust to pressures of up to 8.59GPa. T_N is enhanced from 360 to 383K upon applying an external pressure of 4.97GPa, a rate of 4.63KGPa^-1. NdMnAsO_0.95F_0.05 is shown to violate Bloch's rule which would suggest that NdMnAsO_0.95F_0.05 is on the verge of a localized to itinerant transition. There is no evidence of a structural transition but applied pressure tends to result in more regular As-Mn-As and Nd-O-Nd tetrahedra. The unit cell is significantly more compressible along the c-axis than the a-axis, as the interlayer coupling is weaker than the intrinsic bonds contained within NdO and MnAs slabs.

Original language	English
Article number	116001
Journal	Journal of Physics Condensed Matter
Volume	27
Issue number	11
DOIs	https://doi.org/10.1088/0953-8984/27/11/116001
State	Published - Mar 25 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 IOP Publishing Ltd.

Funding

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/L002493/1

Keywords

CMR
high pressure
neutron diffraction

Access to Document

10.1088/0953-8984/27/11/116001

Cite this

@article{a0895479bb7b4edc9cc1b7f78dc353c5,

title = "A high pressure neutron study of colossal magnetoresistant NdMnAsO0.95F0.05",

abstract = "A high pressure neutron diffraction study of the oxypnictide NdMnAsO0.95F0.05 has been performed at temperatures of 290-383K and pressures up to 8.59GPa. The results demonstrate that the antiferromagnetic order of the Mn spins is robust to pressures of up to 8.59GPa. TN is enhanced from 360 to 383K upon applying an external pressure of 4.97GPa, a rate of 4.63KGPa-1. NdMnAsO0.95F0.05 is shown to violate Bloch's rule which would suggest that NdMnAsO0.95F0.05 is on the verge of a localized to itinerant transition. There is no evidence of a structural transition but applied pressure tends to result in more regular As-Mn-As and Nd-O-Nd tetrahedra. The unit cell is significantly more compressible along the c-axis than the a-axis, as the interlayer coupling is weaker than the intrinsic bonds contained within NdO and MnAs slabs.",

keywords = "CMR, high pressure, neutron diffraction",

author = "Wildman, {E. J.} and Tucker, {M. G.} and McLaughlin, {A. C.}",

note = "Publisher Copyright: {\textcopyright} 2015 IOP Publishing Ltd.",

year = "2015",

month = mar,

day = "25",

doi = "10.1088/0953-8984/27/11/116001",

language = "English",

volume = "27",

journal = "Journal of Physics Condensed Matter",

issn = "0953-8984",

publisher = "IOP Publishing",

number = "11",

}

TY - JOUR

T1 - A high pressure neutron study of colossal magnetoresistant NdMnAsO0.95F0.05

AU - Wildman, E. J.

AU - Tucker, M. G.

AU - McLaughlin, A. C.

PY - 2015/3/25

Y1 - 2015/3/25

N2 - A high pressure neutron diffraction study of the oxypnictide NdMnAsO0.95F0.05 has been performed at temperatures of 290-383K and pressures up to 8.59GPa. The results demonstrate that the antiferromagnetic order of the Mn spins is robust to pressures of up to 8.59GPa. TN is enhanced from 360 to 383K upon applying an external pressure of 4.97GPa, a rate of 4.63KGPa-1. NdMnAsO0.95F0.05 is shown to violate Bloch's rule which would suggest that NdMnAsO0.95F0.05 is on the verge of a localized to itinerant transition. There is no evidence of a structural transition but applied pressure tends to result in more regular As-Mn-As and Nd-O-Nd tetrahedra. The unit cell is significantly more compressible along the c-axis than the a-axis, as the interlayer coupling is weaker than the intrinsic bonds contained within NdO and MnAs slabs.

AB - A high pressure neutron diffraction study of the oxypnictide NdMnAsO0.95F0.05 has been performed at temperatures of 290-383K and pressures up to 8.59GPa. The results demonstrate that the antiferromagnetic order of the Mn spins is robust to pressures of up to 8.59GPa. TN is enhanced from 360 to 383K upon applying an external pressure of 4.97GPa, a rate of 4.63KGPa-1. NdMnAsO0.95F0.05 is shown to violate Bloch's rule which would suggest that NdMnAsO0.95F0.05 is on the verge of a localized to itinerant transition. There is no evidence of a structural transition but applied pressure tends to result in more regular As-Mn-As and Nd-O-Nd tetrahedra. The unit cell is significantly more compressible along the c-axis than the a-axis, as the interlayer coupling is weaker than the intrinsic bonds contained within NdO and MnAs slabs.

KW - CMR

KW - high pressure

KW - neutron diffraction

UR - http://www.scopus.com/inward/record.url?scp=84924217790&partnerID=8YFLogxK

U2 - 10.1088/0953-8984/27/11/116001

DO - 10.1088/0953-8984/27/11/116001

M3 - Article

AN - SCOPUS:84924217790

SN - 0953-8984

VL - 27

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

IS - 11

M1 - 116001

ER -