Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2

G. S. Tucker; R. M. Fernandes; D. K. Pratt; A. Thaler; N. Ni; K. Marty; A. D. Christianson; M. D. Lumsden; B. C. Sales; A. S. Sefat; S. L. Bud'Ko; P. C. Canfield; A. Kreyssig; A. I. Goldman; R. J. McQueeney

doi:10.1103/PhysRevB.89.180503

Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2

G. S. Tucker, R. M. Fernandes, D. K. Pratt, A. Thaler, N. Ni, K. Marty, A. D. Christianson, M. D. Lumsden, B. C. Sales, A. S. Sefat, S. L. Bud'Ko, P. C. Canfield, A. Kreyssig, A. I. Goldman, R. J. McQueeney

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15 Scopus citations

Abstract

Using inelastic neutron scattering, we show that the onset of superconductivity in underdoped Ba(Fe1-xCox)2As2 coincides with a crossover from well-defined spin waves to overdamped and diffusive spin excitations. This crossover occurs despite the presence of long-range stripe antiferromagnetic order for samples in a compositional range from x=0.04 to 0.055, and is a consequence of the shrinking spin-density wave gap and a corresponding increase in the particle-hole (Landau) damping. The latter effect is captured by a simple itinerant model relating Co doping to changes in the hot spots of the Fermi surface. We argue that the overdamped spin fluctuations provide a pairing mechanism for superconductivity in these materials.

Original language	English
Article number	180503
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	89
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.89.180503
State	Published - May 13 2014

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Tucker, G. S., Fernandes, R. M., Pratt, D. K., Thaler, A., Ni, N., Marty, K., Christianson, A. D., Lumsden, M. D., Sales, B. C., Sefat, A. S., Bud'Ko, S. L., Canfield, P. C., Kreyssig, A., Goldman, A. I., & McQueeney, R. J. (2014). Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2. Physical Review B - Condensed Matter and Materials Physics, 89(18), Article 180503. https://doi.org/10.1103/PhysRevB.89.180503

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title = "Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2",

abstract = "Using inelastic neutron scattering, we show that the onset of superconductivity in underdoped Ba(Fe1-xCox)2As2 coincides with a crossover from well-defined spin waves to overdamped and diffusive spin excitations. This crossover occurs despite the presence of long-range stripe antiferromagnetic order for samples in a compositional range from x=0.04 to 0.055, and is a consequence of the shrinking spin-density wave gap and a corresponding increase in the particle-hole (Landau) damping. The latter effect is captured by a simple itinerant model relating Co doping to changes in the hot spots of the Fermi surface. We argue that the overdamped spin fluctuations provide a pairing mechanism for superconductivity in these materials.",

author = "Tucker, {G. S.} and Fernandes, {R. M.} and Pratt, {D. K.} and A. Thaler and N. Ni and K. Marty and Christianson, {A. D.} and Lumsden, {M. D.} and Sales, {B. C.} and Sefat, {A. S.} and Bud'Ko, {S. L.} and Canfield, {P. C.} and A. Kreyssig and Goldman, {A. I.} and McQueeney, {R. J.}",

year = "2014",

month = may,

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doi = "10.1103/PhysRevB.89.180503",

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issn = "1098-0121",

publisher = "American Physical Society",

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Tucker, GS, Fernandes, RM, Pratt, DK, Thaler, A, Ni, N, Marty, K, Christianson, AD , Lumsden, MD, Sales, BC, Sefat, AS, Bud'Ko, SL, Canfield, PC, Kreyssig, A, Goldman, AI & McQueeney, RJ 2014, 'Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2', Physical Review B - Condensed Matter and Materials Physics, vol. 89, no. 18, 180503. https://doi.org/10.1103/PhysRevB.89.180503

TY - JOUR

T1 - Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2

AU - Tucker, G. S.

AU - Fernandes, R. M.

AU - Pratt, D. K.

AU - Thaler, A.

AU - Ni, N.

AU - Marty, K.

AU - Christianson, A. D.

AU - Lumsden, M. D.

AU - Sales, B. C.

AU - Sefat, A. S.

AU - Bud'Ko, S. L.

AU - Canfield, P. C.

AU - Kreyssig, A.

AU - Goldman, A. I.

AU - McQueeney, R. J.

PY - 2014/5/13

Y1 - 2014/5/13

N2 - Using inelastic neutron scattering, we show that the onset of superconductivity in underdoped Ba(Fe1-xCox)2As2 coincides with a crossover from well-defined spin waves to overdamped and diffusive spin excitations. This crossover occurs despite the presence of long-range stripe antiferromagnetic order for samples in a compositional range from x=0.04 to 0.055, and is a consequence of the shrinking spin-density wave gap and a corresponding increase in the particle-hole (Landau) damping. The latter effect is captured by a simple itinerant model relating Co doping to changes in the hot spots of the Fermi surface. We argue that the overdamped spin fluctuations provide a pairing mechanism for superconductivity in these materials.

AB - Using inelastic neutron scattering, we show that the onset of superconductivity in underdoped Ba(Fe1-xCox)2As2 coincides with a crossover from well-defined spin waves to overdamped and diffusive spin excitations. This crossover occurs despite the presence of long-range stripe antiferromagnetic order for samples in a compositional range from x=0.04 to 0.055, and is a consequence of the shrinking spin-density wave gap and a corresponding increase in the particle-hole (Landau) damping. The latter effect is captured by a simple itinerant model relating Co doping to changes in the hot spots of the Fermi surface. We argue that the overdamped spin fluctuations provide a pairing mechanism for superconductivity in these materials.

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U2 - 10.1103/PhysRevB.89.180503

DO - 10.1103/PhysRevB.89.180503

M3 - Article

AN - SCOPUS:84900514328

SN - 1098-0121

VL - 89

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 18

M1 - 180503

ER -

Crossover from spin waves to diffusive spin excitations in underdoped Ba(Fe1-xCox)2As2

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