Vibrating reed measurements are presented of pure poly-crystalline Al with a special sample shape that reduces the influence of the clamping. We find significant differences between the sample being normal conducting or superconducting. The overall behaviour in fact resembles very closely that of metallic glasses and clearly demonstrates that also in Al tunneling systems couple to conduction electrons as expected. As a quantitative result we may state that the density of states of tunneling systems in poly-crystalline Al is considerably smaller than in metallic glasses. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

References

[1] An overview of the field is given e. g in: P. Esquinazi (ed.), Tunneling Systems in Amorphous and Crystalline Solids (Springer, Heidelberg, 1998).
Google Scholar
[2] J. Jäckle, Z. Phys. 257, 212 (1972).
10.1007/BF01401204
Web of Science® Google Scholar
[3] J. L. Black, in: Glassy Metals (Springer, New York, 1981).
Google Scholar
[4] G. Weiss, W. Arnold, K. Dransfeld, and H.-J. Güntherodt, Solid State Commun. 33, 111 (1980).
10.1016/0038-1098(80)90708-5
CAS Web of Science® Google Scholar
[5] G. Weiss, S. Hunklinger, and H. v. Löhneysen, Physica 109 & 110B, 1946 (1982).
CAS Web of Science® Google Scholar
[6] H. Neckel, P. Esquinazi, G. Weiss, and S. Hunklinger, Solid State Commun. 57, 151 (1986).
10.1016/0038-1098(86)90127-4
CAS Web of Science® Google Scholar
[7] P. Esquinazi, H.-M. Ritter, H. Neckel, G. Weiss, and S. Hunklinger, Z. Physik B 64, 81 (1986).
10.1007/BF01313692
CAS Web of Science® Google Scholar
[8] J. L. Black and P. Fulde, Phys. Rev. Lett. 43, 453 (1979).
10.1103/PhysRevLett.43.453
CAS Web of Science® Google Scholar
[9] P. Esquinazi, R. König, and F. Pobell, Z. Phys. B 87, 35 (1992).
10.1007/BF01309284
Web of Science® Google Scholar
[10] R. König, P. Esquinazi, and B. Neppert, Phys. Rev. B 51, 11424 (1995).
10.1103/PhysRevB.51.11424
Web of Science® Google Scholar
[11] J. Classen, M. Hübner, C. Enss, G. Weiss, S. Hunklinger, Phys. Rev. B 56, 812 (1997).
10.1103/PhysRevB.56.8012
Web of Science® Google Scholar
[12] X. Liu, E. J. Thompson, B. E. White, and R. O. Pohl, Phys. Rev. B 59, 11767 (1999).
10.1103/PhysRevB.59.11767
CAS Web of Science® Google Scholar
[13] B. Kübler, M. Burst, R. Haueisen, and G. Weiss, Physica B 316-317, 558 (2002).
10.1016/S0921-4526(02)00572-0
CAS Web of Science® Google Scholar
[14] J. Haust, M. Burst, R. Haueisen, and G. Weiss, J. Low Temp. Phys., accepted for publication.
Google Scholar
[15] Yu. Kagan and N. V. Prokof'ev, JETP Lett. 45, 116 (1987); Solid State Commun. 65, 1385 (1988).
Google Scholar
[16] J. Kondo, Physica B 84, 40 (1976).
10.1016/0378-4363(76)90007-3
Web of Science® Google Scholar
[17] G. Weiss, Mater. Sci. Eng. A 133, 45 (1991).
10.1016/0921-5093(91)90011-B
Web of Science® Google Scholar
[18] J. Classen, C. Enss, C. Bechinger, G. Weiss, and S. Hunklinger, Ann. Phys. 3, 315 (1994).
10.1002/andp.19945060502
CAS Web of Science® Google Scholar
[19] P. Esquinazi, M. A. Ramos, and R. König, J. Low Temp. Phys. 135, 27 (2004).
10.1023/B:JOLT.0000016962.71597.13
CAS Web of Science® Google Scholar
[20] J. T. Stockburger, M. Grifoni, and M. Sasseti, Phys. Rev. B 51, 2835 (1995).
10.1103/PhysRevB.51.2835
CAS Web of Science® Google Scholar