Spin-lattice coupling in iron-pnictide superconductors

T. Egami; B. V. Fine; D. J. Singh; D. Parshall; C. De La Cruz; P. Dai

doi:10.1016/j.physc.2009.11.167

Spin-lattice coupling in iron-pnictide superconductors

T. Egami, B. V. Fine, D. J. Singh, D. Parshall, C. De La Cruz, P. Dai

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

15 Scopus citations

Abstract

The magnetic moment in the parent phase of the iron-pnictide superconductors varies with composition even when the nominal charge of iron is unchanged. We propose the spin-lattice coupling due to the magneto-volume effect as the primary origin of this effect, and formulate a Landau theory to describe the dependence of the moment to the Fe-As layer separation. We then compare the superconductive critical temperature of doped iron pnictides to the local moment predicted by the theory, and suggest that the spin-phonon coupling may play a role in the superconductivity of this compound.

Original language	English
Pages (from-to)	S294-S295
Journal	Physica C: Superconductivity and its Applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.11.167
State	Published - Dec 2010
Externally published	Yes

Funding

This work was supported by the Department of Energy through the EPSCoR Grant, DE-FG02-08ER46528 and the Division of Materials Science and Engineering, Office of Basic Energy Sciences.

Funders	Funder number
U.S. Department of Energy	DE-FG02-08ER46528
Basic Energy Sciences
Division of Materials Sciences and Engineering

Keywords

Iron pnictides
Magneto-volume effect
Phonons
Spin-phonon coupling

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10.1016/j.physc.2009.11.167

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AU - Egami, T.

AU - Fine, B. V.

AU - Singh, D. J.

AU - Parshall, D.

AU - De La Cruz, C.

AU - Dai, P.

PY - 2010/12

Y1 - 2010/12

N2 - The magnetic moment in the parent phase of the iron-pnictide superconductors varies with composition even when the nominal charge of iron is unchanged. We propose the spin-lattice coupling due to the magneto-volume effect as the primary origin of this effect, and formulate a Landau theory to describe the dependence of the moment to the Fe-As layer separation. We then compare the superconductive critical temperature of doped iron pnictides to the local moment predicted by the theory, and suggest that the spin-phonon coupling may play a role in the superconductivity of this compound.

AB - The magnetic moment in the parent phase of the iron-pnictide superconductors varies with composition even when the nominal charge of iron is unchanged. We propose the spin-lattice coupling due to the magneto-volume effect as the primary origin of this effect, and formulate a Landau theory to describe the dependence of the moment to the Fe-As layer separation. We then compare the superconductive critical temperature of doped iron pnictides to the local moment predicted by the theory, and suggest that the spin-phonon coupling may play a role in the superconductivity of this compound.

KW - Iron pnictides

KW - Magneto-volume effect

KW - Phonons

KW - Spin-phonon coupling

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JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SUPPL.1

ER -

Spin-lattice coupling in iron-pnictide superconductors

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