이중 층 La1.4(Sr0.2Ca1.4)Mn2O7 세라믹스의 저온에서의 Small Polaron Hopping 전도

정우환; Woo-Hwan Jung

Korean Journal of Materials Research, Vol.18, No.1, 26-31, January, 2008

DOI10.3740/MRSK.2008.18.1.026 Export Citation

이중 층 La1.4(Sr0.2Ca1.4)Mn2O7 세라믹스의 저온에서의 Small Polaron Hopping 전도

Low-Temperature Small Polaron Hopping Conduction in Bilayer La1.4(Sr0.2Ca1.4)Mn2O7 Ceramics

정우환^†

호원 대학교 전자공학과

Woo-Hwan Jung^†

Department of Electronics,, HoWon University, 727, Wolha-Ri, Impi, GunSan, ChonBuk KOREA, Korea

E-mail:

The dc resistivity and thermoelectric power of bilayered perovskite La1.4(Sr0.2Ca1.4)Mn2O7 were measured as a function of the temperature. In the ferromagnetic phase, ρ(T) was accurately predicted by a0 + a2T2 + a4.5T4.5 with and without an applied field. At high temperatures, a significant difference between the activation energy deduced from the electrical resistivity and thermoelectric power, a characteristic of small polarons, was observed. All of the experimental data can be feasibly explained on the basis of the small polaron.

Keywords:electron-phonon interaction;hopping;jahn-teller effect;localization;small polaron

[References]

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Mahesh R, Wang R, Itoh M, Phys. Rev. B, 57, 104 (1998)
Zhou JS, Goodenough JB, Mitchell JF, Phys. Rev. B, 58, R579 (1998)
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[Referenced By]

[1] Jin S, Tiefel TH, Mccormack M, Fastnacht RA, Ramesh R, Chen LH, Science, 264(5157), 413 (1994)

[2] Synder GJ, Hikes R, DiCarolis S, Beasley MR, Geballe TH, Phys. Rev. B, 53, 14434 (1996)

[3] Chon GB, Im HS, Lee CG, Koo BH, Lee SM, Jung MH, Jo YH, Korean J. Mater. Res., 17(4), 203 (2007)

[4] Chon GB, Koo BH, Lee CG, Korean J. Mater. Res., 16(1), 44 (2006)

[5] Zener C, Phys. Rev., 82, 403 (1951)

[6] Millis AJ, Phys. Rev. B, 53, 8434 (1996)

[7] Millis AJ, Phys. Rev. B, 55, 6405 (1997)

[8] Tyson TY, Mustre de Leon J, Conradson SD, Bishop AR, Neumeier JJ, Roder H, Zang J, Phys. Rev. B, 53, 13958 (1996)

[9] Jaime M, Hardner HT, Salamon MB, Rubinstein M, Dorsey P, Emin D, Phys. Rev Lett., 78, 951 (1997)

[10] Jaime M, Salamon MB, Rubinstein M, Treece RE, Horwitz JS, Chrisey DB, Phys. Rev. B, 54, 11914 (1996)

[11] Potter CD, Swiat M, Bader SD, Argyriou DN, Mitchell JF, Miller DJ, Hinks DG, Jorgensen JD, Phys. Rev. B, 57, 72 (1998)

[12] Sun Y, Xu X, Zhang Y, J. Phys. Condensed. Matter., 11, 10475 (2000)

[13] Moritomo Y, Asasitsu A, Kuwahara H, Tokura Y, Nature, 380, 142 (1996)

[14] Kimura T, Tomioka Y, Kuwahara H, Asamitsu A, Tamura M, Tokura Y, Science, 274(5293), 1698 (1996)

[15] Asano H, Hayakawa J, Matsui M, Appl. Phys. lett, 71, 844 (1997)

[16] Argyriou DA, Mitchell JF, Potter CD, Bader SD, Kleb R, Jorgensen JD, Phys. Rev. B, 55, R11965 (1997)

[17] Asano H, Hayakawa J, Matsui M, Phys. Rev. B, 56, 5395 (1997)

[18] Gupta AK, Kumar V, Bhalla GL, Khare N, J. Alloy and Comp., 438, 56 (2007)

[19] Mahesh R, Wang R, Itoh M, Phys. Rev. B, 57, 104 (1998)

[20] Zhou JS, Goodenough JB, Mitchell JF, Phys. Rev. B, 58, R579 (1998)

[21] Crespi VH, Lu L, Jia YX, Khazeni K, Zettle A, Cohen ML, Phys. Rev. B, 53, 14303 (1996)

[22] Mott NF, Austin IG, Adv. Phys., 18, 41 (1969)

[23] Coey JMD, Viret M, Von Molnar S, Adv. Phys., 48, 167 (1999)