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Title: Short- and long-range magnetic order in LaMnAsO

Abstract

The magnetic properties of the layered oxypnictide LaMnAsO have been revisited using neutron scattering and magnetization measurements. The present measurements identify the Néel temperature TN = 360(1) K. Below TN the critical exponent describing the magnetic order parameter is β=0.33–0.35 , consistent with a three-dimensional Heisenberg model. Above this temperature, diffuse magnetic scattering indicative of short-range magnetic order is observed, and this scattering persists up to TSRO = 650(10) K. Morevoer, the magnetic susceptibility shows a weak anomaly at TSRO and no anomaly at TN. Analysis of the diffuse scattering data using a reverse Monte Carlo algorithm indicates that above TN nearly two-dimensional, short-range magnetic order is present with a correlation length of 9.3(3) Å within the Mn layers at 400 K. The inelastic scattering data reveal a spin gap of 3.5 meV in the long-range ordered state, and strong, low-energy (quasielastic) magnetic excitations emerging in the short-range ordered state. When we compared it with other related compounds correlates the distortion of the Mn coordination tetrahedra to the sign of the magnetic exchange along the layer-stacking direction, and suggests that short-range order above TN is a common feature in the magnetic behavior of layered Mn-based pnictides and oxypnictides.

Authors:
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1237161
Alternate Identifier(s):
OSTI ID: 1236727
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 5; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

McGuire, Michael A., and Garlea, Vasile Ovidiu. Short- and long-range magnetic order in LaMnAsO. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.054404.
McGuire, Michael A., & Garlea, Vasile Ovidiu. Short- and long-range magnetic order in LaMnAsO. United States. https://doi.org/10.1103/PhysRevB.93.054404
McGuire, Michael A., and Garlea, Vasile Ovidiu. 2016. "Short- and long-range magnetic order in LaMnAsO". United States. https://doi.org/10.1103/PhysRevB.93.054404. https://www.osti.gov/servlets/purl/1237161.
@article{osti_1237161,
title = {Short- and long-range magnetic order in LaMnAsO},
author = {McGuire, Michael A. and Garlea, Vasile Ovidiu},
abstractNote = {The magnetic properties of the layered oxypnictide LaMnAsO have been revisited using neutron scattering and magnetization measurements. The present measurements identify the Néel temperature TN = 360(1) K. Below TN the critical exponent describing the magnetic order parameter is β=0.33–0.35 , consistent with a three-dimensional Heisenberg model. Above this temperature, diffuse magnetic scattering indicative of short-range magnetic order is observed, and this scattering persists up to TSRO = 650(10) K. Morevoer, the magnetic susceptibility shows a weak anomaly at TSRO and no anomaly at TN. Analysis of the diffuse scattering data using a reverse Monte Carlo algorithm indicates that above TN nearly two-dimensional, short-range magnetic order is present with a correlation length of 9.3(3) Å within the Mn layers at 400 K. The inelastic scattering data reveal a spin gap of 3.5 meV in the long-range ordered state, and strong, low-energy (quasielastic) magnetic excitations emerging in the short-range ordered state. When we compared it with other related compounds correlates the distortion of the Mn coordination tetrahedra to the sign of the magnetic exchange along the layer-stacking direction, and suggests that short-range order above TN is a common feature in the magnetic behavior of layered Mn-based pnictides and oxypnictides.},
doi = {10.1103/PhysRevB.93.054404},
url = {https://www.osti.gov/biblio/1237161}, journal = {Physical Review B},
issn = {2469-9950},
number = 5,
volume = 93,
place = {United States},
year = {Tue Feb 02 00:00:00 EST 2016},
month = {Tue Feb 02 00:00:00 EST 2016}
}

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Cited by: 25 works
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Works referenced in this record:

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Works referencing / citing this record:

Long- and short-range magnetism in the frustrated double perovskite B a 2 MnW O 6
journal, January 2020


Detecting magnetic ordering with atomic size electron probes
journal, May 2016