Solid State Science and Technology, Vol. 17, No 1 (2009) 50-56

ISSN 0128-7389

ELASTIC PROPERTIES OF EuBa2Cu3O7-δ CERAMICS AT LOW TEMPERATURES

M. F. Bakar and A. K. Yahya

Faculty of Applied Sciences, Universiti Teknologi MARA,

40450 Shah Alam, Selangor, Malaysia

 

ABSTRACT

Ultrasonic velocity measurements on single-phase polycrystalline EuBa2Cu3O7-δ superconducting (δ ~ 0.1) and non-superconducting (δ ~ 0.7) samples have been performed at 9 MHz from 80 K to 280 K in longitudinal mode and from 80 K to 200 K in shear mode. The absolute longitudinal and shear velocities (at 80K) decreased when the oxygen content was reduced from O6.9 to O6.3. For the superconducting sample, a step-like anomaly was observed around 255 K indicating pronounced lattice stiffening in the longitudinal mode. However, a similar observation was not observed in the shear mode possibly due to the lower temperature limit. In addition, no elastic anomalies were observed for the non-superconducting sample in both longitudinal and shear modes. The elastic anomaly was discussed in terms of a phase transition involving oxygen ordering in Cu-O chains. Elastic moduli values and Debye temperature (θD) are also reported.

http://journal.masshp.net/wp-content/uploads/Journal/2009/Jilid%201/M%20F.%20Bakar%2050-56.pdf

 

REFERENCES

[1]. J. G. Bednorz and K. A. Muller, (1986) Condensed Matter 64 189-193

[2]. Hiroaki Kamioka, Nobuyuki Okuda and Shoji Nitta, (1991) Japanese Journal of Applied Science 3 1204-1208.

[3]. S. G Titova, S. G. Sludnov, V. F. Balakirev, O. M. Fyodorova, T. I. Arbusova and O. V. Morosova, (1995) Ceramics International 22 471-475.

[4]. Cankurtaran M, Saunders G A, Wang Q and Celik H, (1995): Supercond. Sci. Technol. 8, 811- 815.

[5]. Cankurtaran M, Saunders G A, Goretta K C (1994), Supercond. Sci. Techno. 7 4-9.

[6]. Chang Fanggao, M. Cankurtaran, G A Saunders, D P Almond, (1990) Supercond. Sci. Techno. 3 546-555.

[7]. R. Nava, M. Saint-Paul, H. Norl, J. C. Levet, M. Potel and P. Gougeon, (1990) Physica C 167 59-61.

[8]. J. Dominec, (1989) Supercond. Sci. Technol. 2 91-102.

[9]. Almond D P,Wang Q, Freestone J, Lambson E F, Chapman B and Saunders G A (1989) J. Phys.: Condens. Matter 1 6853

[10]. Ahmad Kamal Yahya and Abd-Shukor R, (1999) Physica C 314 117-124.

 

[11]. Q.M. Zhang, H.M. Shao, Y.N. Huang, Q. Chen, H.M. Shen, Y.N. Wang, (1996) Physica C 271 11-14

[12]. R. Abd-Shukor, S.S Lee, M. Yahya (1995) Physica C 243 134-138

[13]. A. K. Yahya, R Abd-Shukor, (1998) Supercond. Sci. Technol. 11: 173178

[14]. Yahya A. K. and Abd-Shukor R, (1998) Physica B 252 237

[15]. A. K. Yahya and Abd-Shukor R. (2002) Physica C 15 302-306

[16]. A. K. Yahya, N.A. Hamid, Abd-Shukor R, H. Imad, (2004) Ceramics International, 30 1597 1601

[17]. Ahmad Kamal Yahya, A. K. Koh, R. Abd-Shukor. (1999) Physics Letters A 295-301.

[18]. Nor Azah Nik Jaafar, R. Abd-Shukor, (2001) Physics Letters A 288 105-110

[19]. E. Marlianto, M. Yahya, M. M. Salleh and R. Abd-Shukor, (1998) Journal of Alloys and Compound 274 55-58

[20]. Ceder G, Asta M and de Fontaine D, (1991) Physica C 177 106

[21]. K Masato, K Mikael and Y Masatomo, (1996) Phys. Rev. B 53 11796 - 11806