NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN <font>CeCoGe</font><sub>3</sub>

Settai, Rikio; Okuda, Y.; Sugitani, I.; Ōnuki, Yoshichika; Matsuda, Tatsuma D.; Haga, Yoshinori; Harima, Hisatomo

doi:10.1142/s0217979207044287

Cited by 38 publications

(32 citation statements)

References 14 publications

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“…Another strongly correlated non-centrosymmetric material, CeCoGe3, (not discussed here) is an antiferromagnet that superconducts (Tc = 0.72 K) under pressure (5.6 GPa) with a high (~7 T, or five times HP) Hc2, taken as consistent with triplet superconductivity. (Settai et al [571] and Kneidinger et al [67])…”

Section: Non-centro-symmetric Superconductorsmentioning

confidence: 96%

Unconventional superconductivity

Stewart

2017

Advances in Physics

222

165

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Abstract:"Conventional" superconductivity, as used in this review, refers to electron-phonon coupled superconducting electron pairs described by BCS theory. Unconventional superconductivity refers to superconductors where the Cooper pairs are not bound together by phonon-exchange but instead by exchange of some other kind, e. g. spin fluctuations in a superconductor with magnetic order either coexistent or nearby in the phase diagram. Such unconventional superconductivity has been known experimentally since heavy fermion CeCu2Si2, with its strongly correlated 4f electrons, was discovered to superconduct below 0.6 K in 1979. Since the discovery of unconventional superconductivity in the layered cuprates in 1986, the study of these materials saw Tc jump to 164 K by 1994. Further progess in high temperature superconductivity would be aided by understanding the cause of such unconventional pairing. This review compares the fundamental properties of 9 unconventional superconducting classes of materialsfrom 4f-electron heavy fermions to organic superconductors to classes where only three known members exist to the cuprates with over 200 examples -with the hope that common features will emerge to help theory explain (and predict!) these phenomena. In addition, three new emerging classes of superconductors (topological, interfacial -e. g. FeSe on SrTiO3, and H2S under high pressure) are briefly covered, even though their "conventionality" is not yet fully determined.

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Section: Non-centro-symmetric Superconductorsmentioning

confidence: 96%

Unconventional superconductivity

Stewart

2017

Advances in Physics

222

165

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“…In turn it is was long believed that pure spin-triplet heavy-fermion superconductivity cannot exist in non-centrosymmetric systems. This is contrasted by the recent discovery of supercondcuctivity in the antiferromagnets CePt 3 Si (Bauer et al, 2004a), CeRhSi 3 , CeIrSi 3 (Suginishi and Shimahara, 2006) and CeCoGe 3 (Kawai et al, 2008b;Settai et al, 2007a). Perhaps most remarkably superconductivity has even been discovered at the border of ferromagnetism in the non-centrosymmetric compound UIr (Akazawa et al, 2004a,b).…”

Section: A Non-centrosymmetric Superconductorsmentioning

confidence: 99%

“…Following the discovery of superconductivity in the antiferromagnetic state of the non-centrosymmetric heavyfermion system CePt 3 Si superconductivity was also discovered in the non-centrosymmetric systems CeRhSi 3 , CeIrSi 3 (Suginishi and Shimahara, 2006) and CeCoGe 3 (Kawai et al, 2008b;Settai et al, 2007a). These compounds belong to the class of isostructural CeMX 3 systems, where M=Co, Ru, Pd, Os, Ir, Pt, Fe, Rh and X=Si and Ge.…”

Section: Cemx3mentioning

confidence: 99%

Superconducting phases off-electron compounds

2009

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Intermetallic compounds containing f-electron elements display a wealth of superconducting phases, that are prime candidates for unconventional pairing with complex order parameter symmetries. For instance, superconductivity has been found at the border of magnetic order as well as deep within ferro-and antiferromagnetically ordered states, suggesting that magnetism may promote rather than destroy superconductivity. Superconductivity near valence transitions, or in the vicinity of magneto-polar order are candidates for new superconductive pairing interactions such as fluctuations of the conduction electron density or the crystal electric field, respectively. The experimental status of the study of the superconducting phases of f-electron compounds is reviewed.

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“…The temperature-pressure (T -P) phase diagrams of CeRhSi 3 [72], CeIrSi 3 [75], CeCoGe 3 [76] and CeIrGe 3 [42] are shown in Fig. 15.…”

Section: Temperature-pressure Phase Diagrammentioning

confidence: 99%

Non-centrosymmetric Heavy-Fermion Superconductors

Kimura

Bonalde

2012

Non-Centrosymmetric Superconductors

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In this chapter we discuss the physical properties of a particular family of non-centrosymmetric superconductors belonging to the class heavy-fermion compounds. This group includes the ferromagnet UIr and the antiferromagnets CeRhSi 3 , CeIrSi 3 , CeCoGe 3 , CeIrGe 3 and CePt 3 Si, of which all but CePt 3 Si become superconducting only under pressure. Each of these superconductors has intriguing and interesting properties. We first analyze CePt 3 Si, then review CeRhSi 3 , CeIrSi 3 , CeCoGe 3 and CeIrGe 3 , which are very similar to each other in their magnetic and electrical properties, and finally discuss UIr. For each material we discuss the crystal structure, magnetic order, occurrence of superconductivity, phase diagram, characteristic parameters, superconducting properties and pairing states. We present an overview of the similarities and differences between all these six compounds at the end. CePt 3 SiThe enormous interest in superconductors without inversion symmetry started with the discovery of superconductivity in the heavy-fermion compound CePt 3 Si [1], which exhibits long-range antiferromagnetic (AFM) order below the Neel temperature T N = 2.2 K and becomes superconducting at the critical temperature T c = 0.75 K. CePt 3 Si is the only known heavy-fermion (HF) compound without inversion symmetry that superconducts at ambient pressure, as opposed to the cases of CeIrSi 3 , CeRhSi 3 , CeCoGe 3 , CeIrGe 3 and UIr. The heavy-fermion character has

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NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN CeCoGe₃

Cited by 38 publications

References 14 publications

Unconventional superconductivity

Unconventional superconductivity

Superconducting phases off-electron compounds

Non-centrosymmetric Heavy-Fermion Superconductors

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NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN CeCoGe3

Cited by 38 publications

References 14 publications

Unconventional superconductivity

Unconventional superconductivity

Superconducting phases off-electron compounds

Non-centrosymmetric Heavy-Fermion Superconductors

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Product

Resources

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NON-CENTROSYMMETRIC HEAVY FERMION SUPERCONDUCTIVITY IN CeCoGe₃