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Spin-Flip of Polaron in Polymers with a Magnetic Impurity |
| CHEN Mei-Juan;YAN Yong-Hong;WU Chang-Qin |
| Department of Physics, Fudan University, Shanghai 200433 |
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| Cite this article: |
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CHEN Mei-Juan, YAN Yong-Hong, WU Chang-Qin 2007 Chin. Phys. Lett. 24 1690-1692 |
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Abstract Using a nonadiabatic evolution method, we investigate the spin-flip process of polaron in polymers with a magnetic impurity. Our results show that when the spin orientation of this impurity is fixed to be perpendicular to the spin of polaron (θ=π/2), the magnetic impurity causes a spin-flip process. The probability of the spin-flip increases with the increase of exchange integral
J up to about 0.35eV and then decreases with the increase of J. In the case J is fixed while the spin orientation is adjustable, we find the probability of the spin-flip varies with the impurity orientation and reaches a maximum value at θ=π/2.
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| Keywords:
71.38.-k
72.25.-b
72.80.Le
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Received: 03 November 2006
Published: 17 May 2007
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| PACS: |
71.38.-k
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(Polarons and electron-phonon interactions)
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72.25.-b
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(Spin polarized transport)
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72.80.Le
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(Polymers; organic compounds (including organic semiconductors))
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[1] Wolf S A, Awschalom D D, Buhrman R A, Daughton J M, vonMolnar S, Roukes M L, Chtchelkanova A Y and Treger D M 2001 Science 294 1488
[2] Prinz G A 1998 Science 282 1660
[3] Dediu V, Murgia M, Matacotta F C, Taliani C and Barbanera S2002 Solid State Commun. 122 181
[4] Xiong Z H, Wu D, Vardeny Z V and Shi J 2004 Nature 427 821
[5] Brazovskii S A and Kirova N N 1981 Sov. Phys. JETPLett. 33 4
[6] Heeger A J, Kivelson S, Schrieffer J R and Su WP 1988 Rev. Mod. Phys. 60 781 and references therein
[7] Johansson A and Stafstr\"om S 2001 Phys. Rev. Lett. 86 3602
[8] Rakhmanova S V and Conwell E M 1999 Appl. Phys. Lett. 75 1518
[9] Wu C Q, Qiu Y, An Z and Nasu K 2003 Phys. Rev. B 68 125416
[10] An Z, Wu C Q and Sun X 2004 Phys. Rev. Lett. 93216407
[11] Yu J F, Wu C Q, Sun X and Nasu K 2004 Phys. Rev. B 70 064303
[12] Yan Y H, An Z and Wu C Q 2004 Euro. Phys. J. B 42157
[13] Pinheiro C da S and e Silva G M 2002 Phys. Rev. B 65 094304
[14] Yan Y H, Chen M J and Wu C Q 2006 Chin. Phys. Lett. 23 2549
[15] Su W P, Schrieffer J R and Heeger A J 1979 Phys. Rev.Lett. 42 1698
[16] Ono Y, Kuwabara M and Terai A 1991 J. Phys. Soc. Jpn. 60 3120 |
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