Observations of Pauli paramagnetic effects on the flux line lattice in CeCoIn5

Jonathan White; P Das; MR Eskildsen; L DeBeer-Schmitt; Edward Forgan; AD Bianchi; M Kenzelmann; M Zolliker; S Gerber; JL Gavilano; J Mesot; R Movshovich; ED Bauer; JL Sarrao; C Petrovic

doi:10.1088/1367-2630/12/2/023026

Observations of Pauli paramagnetic effects on the flux line lattice in CeCoIn5

Jonathan White, P Das, MR Eskildsen, L DeBeer-Schmitt, Edward Forgan, AD Bianchi, M Kenzelmann, M Zolliker, S Gerber, JL Gavilano, J Mesot, R Movshovich, ED Bauer, JL Sarrao, C Petrovic

Physics and Astronomy

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Abstract

From small-angle neutron scattering studies of the flux line lattice (FLL) in CeCoIn5, with magnetic field applied parallel to the crystal c-axis, we obtain the field and temperature dependence of the FLL form factor (FF), which is a measure of the spatial variation of the field in the mixed state. We extend our earlier work (Bianchi et al 2008 Science 319 177) to temperatures up to 1250 mK. Over the entire temperature range, paramagnetism in the flux line cores results in an increase of the FF with field. Near H-c2 the FF decreases again, and our results indicate that this fall-off extends outside the proposed Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) region. Instead, we attribute the decrease to a paramagnetic suppression of Cooper pairing. At higher temperatures, a gradual crossover toward more conventional mixed state behavior is observed.

Original language	English
Pages (from-to)	023026
Number of pages	1
Journal	New Journal of Physics
Volume	12
DOIs	https://doi.org/10.1088/1367-2630/12/2/023026
Publication status	Published - 1 Feb 2010

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White, J., Das, P., Eskildsen, MR., DeBeer-Schmitt, L., Forgan, E., Bianchi, AD., Kenzelmann, M., Zolliker, M., Gerber, S., Gavilano, JL., Mesot, J., Movshovich, R., Bauer, ED., Sarrao, JL., & Petrovic, C. (2010). Observations of Pauli paramagnetic effects on the flux line lattice in CeCoIn5. New Journal of Physics, 12, 023026. https://doi.org/10.1088/1367-2630/12/2/023026

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title = "Observations of Pauli paramagnetic effects on the flux line lattice in CeCoIn5",

abstract = "From small-angle neutron scattering studies of the flux line lattice (FLL) in CeCoIn5, with magnetic field applied parallel to the crystal c-axis, we obtain the field and temperature dependence of the FLL form factor (FF), which is a measure of the spatial variation of the field in the mixed state. We extend our earlier work (Bianchi et al 2008 Science 319 177) to temperatures up to 1250 mK. Over the entire temperature range, paramagnetism in the flux line cores results in an increase of the FF with field. Near H-c2 the FF decreases again, and our results indicate that this fall-off extends outside the proposed Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) region. Instead, we attribute the decrease to a paramagnetic suppression of Cooper pairing. At higher temperatures, a gradual crossover toward more conventional mixed state behavior is observed.",

author = "Jonathan White and P Das and MR Eskildsen and L DeBeer-Schmitt and Edward Forgan and AD Bianchi and M Kenzelmann and M Zolliker and S Gerber and JL Gavilano and J Mesot and R Movshovich and ED Bauer and JL Sarrao and C Petrovic",

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TY - JOUR

T1 - Observations of Pauli paramagnetic effects on the flux line lattice in CeCoIn5

AU - White, Jonathan

AU - Das, P

AU - Eskildsen, MR

AU - DeBeer-Schmitt, L

AU - Forgan, Edward

AU - Bianchi, AD

AU - Kenzelmann, M

AU - Zolliker, M

AU - Gerber, S

AU - Gavilano, JL

AU - Mesot, J

AU - Movshovich, R

AU - Bauer, ED

AU - Sarrao, JL

AU - Petrovic, C

PY - 2010/2/1

Y1 - 2010/2/1

N2 - From small-angle neutron scattering studies of the flux line lattice (FLL) in CeCoIn5, with magnetic field applied parallel to the crystal c-axis, we obtain the field and temperature dependence of the FLL form factor (FF), which is a measure of the spatial variation of the field in the mixed state. We extend our earlier work (Bianchi et al 2008 Science 319 177) to temperatures up to 1250 mK. Over the entire temperature range, paramagnetism in the flux line cores results in an increase of the FF with field. Near H-c2 the FF decreases again, and our results indicate that this fall-off extends outside the proposed Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) region. Instead, we attribute the decrease to a paramagnetic suppression of Cooper pairing. At higher temperatures, a gradual crossover toward more conventional mixed state behavior is observed.

AB - From small-angle neutron scattering studies of the flux line lattice (FLL) in CeCoIn5, with magnetic field applied parallel to the crystal c-axis, we obtain the field and temperature dependence of the FLL form factor (FF), which is a measure of the spatial variation of the field in the mixed state. We extend our earlier work (Bianchi et al 2008 Science 319 177) to temperatures up to 1250 mK. Over the entire temperature range, paramagnetism in the flux line cores results in an increase of the FF with field. Near H-c2 the FF decreases again, and our results indicate that this fall-off extends outside the proposed Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) region. Instead, we attribute the decrease to a paramagnetic suppression of Cooper pairing. At higher temperatures, a gradual crossover toward more conventional mixed state behavior is observed.

U2 - 10.1088/1367-2630/12/2/023026

DO - 10.1088/1367-2630/12/2/023026

M3 - Article

VL - 12

SP - 023026

JO - New Journal of Physics

JF - New Journal of Physics

ER -

Observations of Pauli paramagnetic effects on the flux line lattice in CeCoIn5

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