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Amorphous magnetism II
all the various methods of energy gap determination and that at present there is no completely unambiguous evidence for the existence of intrinsic anisotropy in the energy gap. Their treatment is in terms of the Markowitz-Kadanoff approach. This approach is related to the microscopic theory in the nearly free electron limit in a later contribution by N.C. Cirillo and W.L. Clinton. This book gives an excellent up to date account of the state of understanding of anisotropy effects in superconductors. It is an uncompromisingly specialist book primariliy aimed at research workers in the field or closely allied fields. The main value of the book probably lies in the six substantial invited review articles which give the book some structure. It is unfortunate that more attention has not been given to peripherals, the author and subject indexes are perfunctory and the text would have benefitted by the inclusion of a more substantial preface or introduction giving a retrospective overview of the discussion meeting as a whole.
J.E. Evetts
Amorphous magnetism II Edited by R.A. Levy and R. Hasegawa Published by Plenum Press (1977) 680 pp, $71.40 This volume comprises the proceedings of the Second International Symposium on Amorphous Magnetism held at Rensselaer Polytechnic Institute in August, 1976. The ftrst symposium was held in 1972 and this new volume (which is 50% bigger than the first) reflects the growth of the subject since then, particularly in the field of spin glasses. This is an exciting area of physics and this volume forms a good introduction to the interesting areas. For the outsider there are useful review papers with copious references and the expert will find it a source of interesting work. As this is an area of solid state physics which has grown rapidly over the last few years this volume should play a useful role in introducing new workers to the subject. It suffers from the normal disadvantage of conference proceedings that it contains a large number of disparate papers. However, in this case most contributions are about ten pages long which seems to be enough space for their authors to be able to say something interesting in a comprehensible manner. The volume consists of the text of sixty-two papers and the discussion which followed them: there is also an index.
C R Y O G E N I C S . A P R I L 1978
The papers divide into several groups: spin glasses, the resistance minimum and Kondo effect, amorphous ferromagnets and lattice structures of metallic and oxide glasses. The spin glass papers include invited review papers on the theory and experiment by P.W. Anderson and J.A. Mydosh. These form an excellent introduction to the more detailed contributions which divide fairly equally between theory and experiment. There are a number of papers on the magnetic properties of amorphous transition metal ferromagnets. Their use in magnetic devices was reviewed by F.E. Luborsky. Several contributions were concerned with magnetostriction and anisotropy in these materials. Another group of papers was concerned with the pronounced low temperature resistance minimum found in amorphous metallic systems. There was discussion on the origin of this effect. The two possibilities are that it could be due to the Kondo effect or due to scattering from structural degeneracies. The two mechanisms may be separated by annealing or using pressure or a magnetic field. Finally the structure of the oxide and silicate glasses was discussed from both a theoretical and an experimental point of view. This conference proceedings will be useful in a general solid state physics library as a record of the 'state of the art' at this time.
G. Gehring
Corrigenda Vol 17 No 10 'A correlation for heat transfer to supercritical helium in turbulent flow in small channels' Page 551 Second colunm, 22 line should read: 'For the data reported by Pronkoa, ' Page 552 Reference 2 the ftrst named author should be Giarratano, P.J. Vol 17 No 11 'Equations of state for ethane, propane, n-butane and n-pentane' Page 594 Table 5 The constant as for ethane should be: - 0.2507696766 x 101°
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J.E. Evetts
Amorphous magnetism II Edited by R.A. Levy and R. Hasegawa Published by Plenum Press (1977) 680 pp, $71.40 This volume comprises the proceedings of the Second International Symposium on Amorphous Magnetism held at Rensselaer Polytechnic Institute in August, 1976. The ftrst symposium was held in 1972 and this new volume (which is 50% bigger than the first) reflects the growth of the subject since then, particularly in the field of spin glasses. This is an exciting area of physics and this volume forms a good introduction to the interesting areas. For the outsider there are useful review papers with copious references and the expert will find it a source of interesting work. As this is an area of solid state physics which has grown rapidly over the last few years this volume should play a useful role in introducing new workers to the subject. It suffers from the normal disadvantage of conference proceedings that it contains a large number of disparate papers. However, in this case most contributions are about ten pages long which seems to be enough space for their authors to be able to say something interesting in a comprehensible manner. The volume consists of the text of sixty-two papers and the discussion which followed them: there is also an index.
C R Y O G E N I C S . A P R I L 1978
The papers divide into several groups: spin glasses, the resistance minimum and Kondo effect, amorphous ferromagnets and lattice structures of metallic and oxide glasses. The spin glass papers include invited review papers on the theory and experiment by P.W. Anderson and J.A. Mydosh. These form an excellent introduction to the more detailed contributions which divide fairly equally between theory and experiment. There are a number of papers on the magnetic properties of amorphous transition metal ferromagnets. Their use in magnetic devices was reviewed by F.E. Luborsky. Several contributions were concerned with magnetostriction and anisotropy in these materials. Another group of papers was concerned with the pronounced low temperature resistance minimum found in amorphous metallic systems. There was discussion on the origin of this effect. The two possibilities are that it could be due to the Kondo effect or due to scattering from structural degeneracies. The two mechanisms may be separated by annealing or using pressure or a magnetic field. Finally the structure of the oxide and silicate glasses was discussed from both a theoretical and an experimental point of view. This conference proceedings will be useful in a general solid state physics library as a record of the 'state of the art' at this time.
G. Gehring
Corrigenda Vol 17 No 10 'A correlation for heat transfer to supercritical helium in turbulent flow in small channels' Page 551 Second colunm, 22 line should read: 'For the data reported by Pronkoa, ' Page 552 Reference 2 the ftrst named author should be Giarratano, P.J. Vol 17 No 11 'Equations of state for ethane, propane, n-butane and n-pentane' Page 594 Table 5 The constant as for ethane should be: - 0.2507696766 x 101°
255