| Records |
Author  |
Bauer, E.; Kaldarar, H.; Prokofiev, A.; Royanian, E.; Amato, A.; Sereni, J.G.; Bramer-Escamilla, W.; Bonalde, I. |
| Title |
Heavy Fermion Superconductivity and Antiferromagnetic Ordering in CePt3Si without Inversion Symmetry |
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Journal Article |
| Year |
2007 |
Publication |
Journal of the Physical Society of Japan |
Abbreviated Journal |
J. Phys. Soc. Japan |
| Volume |
76 |
Issue |
5 |
Pages |
051009 |
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| Abstract |
Heavy fermion superconductivity in absence of inversion symmetry of the crystal structure is basically controlled by a Rashba-like antisymmetric spin orbit coupling which splits the Fermi surface and removes the spin degeneracy of electrons. The Fermi surface splitting originates a mixing of spin-singlet and spin-triplet states in the superconducting condensate. Such constraints are responsible for various uncommon features of the superconducting ground state and are discussed here in view of CePt 3 Si, the first heavy fermion superconductor missing a centre of symmetry. We recall and discuss normal and superconducting properties of CePt 3 Si and relate them to recently developed phenomenological theories. |
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BT @ pedrazp @ |
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687 |
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| Author |
Sereni, J.G. |
| Title |
Thermodynamical analysis of the magnetic phase diagrams of Ce systems |
Type |
Journal Article |
| Year |
2001 |
Publication |
Journal of the Physical Society of Japan |
Abbreviated Journal |
J. Phys. Soc. Japan |
| Volume |
70 |
Issue |
7 |
Pages |
2139-2150 |
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Three types of magnetic phase diagrams as a function of composition or pressure, f (z, p), are identified among Ce systems: I) with the ordering temperature T-ord --> 0 monotonously, followed by a narrow region where non-Fermi-liquid (NFL) behavior is observed; II) with T-ord vanishing at finite temperature, but followed by an extended NFL region, and III) where T-ord remains nearly constant. Among the analyzed systems intrinsic differences are found in the evolution of their respective properties, namely: in group-1 an increase of the density of excitations is observed below T-ord. In group-II the evanescense of T-ord(z, p) coincides with the extrapolation to zero of the magnetic free energy (DeltaG --> 0), and the existence of a reference function implying that T-K not equal f (z, p), whereas T-ord = f (z, p). Finally, group-III is also characterized by the evanescense of T-ord where DeltaG --> 0, but in this case T-ord not equal f (z, p) whereas T-K = f (z, p). The characteristics of each group are discussed and compared together with the different C-p(T)/T dependencies at T greater than or equal to T-ord and some related scalings, which allow to recognize a quasi-paramagnetic phase. |
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0031-9015 |
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ISI:000170077600046 |
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BT @ hernan @ |
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77 |
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| Author |
Sereni, J.G. |
| Title |
Comparative study of magnetic phase diagrams of Ce compounds |
Type |
Journal Article |
| Year |
1998 |
Publication |
Journal of the Physical Society of Japan |
Abbreviated Journal |
J. Phys. Soc. Japan |
| Volume |
67 |
Issue |
5 |
Pages |
1767-1775 |
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Thermal properties of magnetically ordered Ce-lattice systems are compared in their crossover to the non-magnetic state, driven by alloying effects. The ordering temperature (T-ord=T-N or T-C) is found to go to zero continuously only in a few cases, while in others a discontinuity in its decrease is clearly observed. Coincidentally, the magnetic contribution to the specific heat (C-p), the entropy and the free energy variations with temperature mark an evident difference between those cases. Furthermore, the extension of the non-fermi-liquid (NFL) phase in terms of concentration variation correlates with differences observed in the respective ordered phase. A systematic transformation from a mean field like transition to a fluctuation dominated type is observed in C-p(T), as the system overcomes a characteristic crossover concentration. Such a concentration appears as a limit for the NFL behavior in the paramagnetic phase above T-ord. A possible origin of the mentioned differences are discussed in terms of some alternatives in the evolution of the magnetic moments and the strength of their interactions. |
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0031-9015 |
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ISI:000073878900044 |
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BT @ hernan @ |
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87 |
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