An electrodynamic balance has been constructed in which the perturbative forces from applied magnetic fields are used to probe the superconducting properties of single levitated charged grains of high Tc superconductors with diameters ≲10 μm. The low‐temperature magnetization of selected Ba2YCu3O7 grains has been observed to exhibit a flux exclusion near 80% of the theoretical maximum. Hysteresis, flux creep, and the lower critical field are identified.
REFERENCES
1.
L. F.
Schneemeyer
, J. V.
Wazezak
, T.
Siegrist
, R. B.
Van Dover
, L. W.
Rupp
, B.
Battlog
, R. J.
Cava
, and D. W.
Murphy
, Nature
332
, 601
(1987
).2.
W.
Tozer
, A. W.
Kleinsasser
, T.
Penney
, D.
Kaiser
, and F.
Holtzberg
, Phys. Rev. Lett.
59
, 1768
(1987
).3.
J. E. Fischer, P. A. Heiney, P. K. Davies, and D. Vaknin, Phys. Rev. B (in press).
4.
R. J. Highmore (private communication);
G. S.
Grader
, P. K.
Gallagher
, J.
Thompson
, and M.
Gurvitch
, Appl. Phys. A
45
, 179
(1988
).5.
P. K. Gallagher, G. S. Grader, and H. M. O’Bryan, to be published in Solid State Ionics.
6.
S.
Ikeda
, H.
Ichinose
, T.
Kimura
, T.
Matsumoto
, H.
Maeda
, Y.
Ishida
, and K.
Ogawa
, Jpn. J. Appl. Phys.
27
, L999
(1988
);R. M.
Hazen
, C. T.
Prewitt
, R. J.
Angel
, N. L.
Ross
, L. W.
Finger
, C. G.
Hadidiacos
, D. R.
Veblen
, P. J.
Heaney
, P. H.
Hor
, R. L.
Meng
, Y. Y.
Sun
, Y. Q.
Wang
, Y. Y.
Xue
, Z. J.
Huang
, L.
Gao
, J.
Bechtold
, and C. W.
Chu
, Phys. Rev. Lett.
60
, 1174
(1988
).7.
M.
Kikuehi
, N.
Kobayashi
, H.
Iwasaki
, D.
Shindo
, T.
Oku
, A.
Tokiwa
, T.
Kajitani
, K.
Hiraya
, K.
Syono
, and Y.
Muto
, Jpn. J. Appl. Phys.
27
, L1050
(1988
).8.
R. F.
Wuerker
, H.
Shelton
, and R. V.
Langmuir
, J. Appl. Phys.
30
, 342
(1959
).9.
10.
11.
R. H. Frickel, R. E. Shaffer, and J. B. Stamattoff, Technical Report ARCSL‐TR‐77041, U.S. Army Armament Research and Development Command, Chemical Systems Laboratory, Aberdeen Proving Ground, MD, 1978;
12.
13.
Andonian Cyrogenics Inc., Newtonville, MA.
14.
G.
Sageev (Grader)
, J. H.
Sienfeld
, and R. C.
Flagan
, Rev. Sci. Instrum.
57
, 933
(1986
).15.
D. Shoenberg, Superconductivity (Cambridge University, Cambridge, United Kingdom, 1960).
16.
M. Tinkham, Introduction so Superconductivity (McGraw‐Hill, New York, 1975).
17.
Y.
Yeshurun
and A. P.
Malozemoff
, Phys. Rev. Lett.
60
, 2202
(1988
).18.
D. R.
Harshman
, G.
Aeppli
, E. J.
Ansaldo
, B.
Batlogg
, J. H.
Brewer
, J. F.
Carolan
, R. J.
Cava
, M.
Celio
, A. C. D.
Chaklader
, W. N.
Hardy
, S. R.
Kreitzman
, G. M.
Luke
, D. R.
Noakes
, and M.
Senba
, Phys. Rev. B
36
, 2386
(1987
);A. T.
Fiory
, A. F.
Hebard
, P. M.
Mankiewich
, and R. E.
Howard
, Phys. Rev. Lett.
61
, 1419
(1988
).19.
S. J.
Hagen
, T. W.
Jing
, Z. Z.
Wang
, J.
Horvath
, and N. P.
Ong
, Phys. Rev. B
37
, 7928
(1988
).20.
A. K.
Gover
, C.
Radhakrishnamurty
, P.
Chaddah
, G.
Ravi Kumar
, and G. V.
Subba Rao
, Pramäna‐J. Phys.
30
, 569
(1988
).
This content is only available via PDF.
© 1988 American Institute of Physics.
1988
American Institute of Physics
You do not currently have access to this content.