Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe sub( 2)(As sub( 1-x)P sub( x)) sub( 2)
We report on ...As-NMR measurements in single crystalline BaFe...(As...P...)... for magnetic fields parallel to the orthorhombic [110]... and [100]... directions above the structural transition temperature T... \( \simeq \) 121 K. A large difference in the linewidth between the two field directions...
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| Veröffentlicht in: | Journal of the Physical Society of Japan 2015-04, Vol.84 (4), p.1-1 |
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| container_title | Journal of the Physical Society of Japan |
| container_volume | 84 |
| creator | Iye, Tetsuya Julien, Marc-Henri Mayaffre, Hadrien Horvatic, Mladen Berthier, Claude Ishida, Kenji Ikeda, Hiroaki Kasahara, Shigeru Shibauchi, Takasada Matsuda, Yuji |
| description | We report on ...As-NMR measurements in single crystalline BaFe...(As...P...)... for magnetic fields parallel to the orthorhombic [110]... and [100]... directions above the structural transition temperature T... \( \simeq \) 121 K. A large difference in the linewidth between the two field directions reveals in-plane anisotropy of the electric field gradient, even in the tetragonal phase. This provides microscopic evidence of population imbalance between As-4p... and 4p... orbitals, which reaches |n... - n...|/|n... + n...| ~ 15% at T ... T... and is a natural consequence of the orbital ordering of Fe-3d... and d... electrons. Surprisingly, this orbital polarization is found to be already static near room temperature, suggesting that it arises from the pinning of anisotropic orbital fluctuations by disorder. The effect is found to be stronger below ~160 K, which coincides with the appearance of nematicity in previous torque and photoemission measurements. These results impose strong constraints on microscopic models of the nematic state. (ProQuest: ... denotes formulae/symbols omitted.) |
| format | Article |
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A large difference in the linewidth between the two field directions reveals in-plane anisotropy of the electric field gradient, even in the tetragonal phase. This provides microscopic evidence of population imbalance between As-4p... and 4p... orbitals, which reaches |n... - n...|/|n... + n...| ~ 15% at T ... T... and is a natural consequence of the orbital ordering of Fe-3d... and d... electrons. Surprisingly, this orbital polarization is found to be already static near room temperature, suggesting that it arises from the pinning of anisotropic orbital fluctuations by disorder. The effect is found to be stronger below ~160 K, which coincides with the appearance of nematicity in previous torque and photoemission measurements. These results impose strong constraints on microscopic models of the nematic state. 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A large difference in the linewidth between the two field directions reveals in-plane anisotropy of the electric field gradient, even in the tetragonal phase. This provides microscopic evidence of population imbalance between As-4p... and 4p... orbitals, which reaches |n... - n...|/|n... + n...| ~ 15% at T ... T... and is a natural consequence of the orbital ordering of Fe-3d... and d... electrons. Surprisingly, this orbital polarization is found to be already static near room temperature, suggesting that it arises from the pinning of anisotropic orbital fluctuations by disorder. The effect is found to be stronger below ~160 K, which coincides with the appearance of nematicity in previous torque and photoemission measurements. These results impose strong constraints on microscopic models of the nematic state. 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A large difference in the linewidth between the two field directions reveals in-plane anisotropy of the electric field gradient, even in the tetragonal phase. This provides microscopic evidence of population imbalance between As-4p... and 4p... orbitals, which reaches |n... - n...|/|n... + n...| ~ 15% at T ... T... and is a natural consequence of the orbital ordering of Fe-3d... and d... electrons. Surprisingly, this orbital polarization is found to be already static near room temperature, suggesting that it arises from the pinning of anisotropic orbital fluctuations by disorder. The effect is found to be stronger below ~160 K, which coincides with the appearance of nematicity in previous torque and photoemission measurements. These results impose strong constraints on microscopic models of the nematic state. (ProQuest: ... denotes formulae/symbols omitted.)</abstract></addata></record> |
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| issn | 0031-9015 1347-4073 |
| language | eng |
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| source | Alma/SFX Local Collection |
| subjects | Anisotropy Disorders Electric fields Emergence Magnetic fields Orbitals Order disorder Symbols |
| title | Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe sub( 2)(As sub( 1-x)P sub( x)) sub( 2) |
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