Pressure-induced superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si4.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>CeCoGe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:math> without inversion symmetry

Settai, Rikio; Sugitani, I.; Okuda, Y.; Thamizhavel, A.; Nakashima, Miho; Ōnuki, Yoshichika; Harima, Hisatomo

doi:10.1016/j.jmmm.2006.10.717

Cited by 108 publications

(77 citation statements)

References 6 publications

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“…This wave vector corresponds to (3/8,3/8,-3/8) in the primitive cell and can be labeled k 10 in Kovalev's 37 notation. At this point, it is worth mentioning that the same wave vector k = (0,0,3/4) has also been observed in a recent single-crystal neutron diffraction study by Kaneko et al 21 on isostructural CeCoGe 3 . However, these authors also reveal the existence of another dominant wave vector k = (0,0,1/2), not detected in our CeRhGe 3 sample, with intensities associated with k being a factor 7 higher than those associated with k = (0,0,3/4).…”

Section: E Magnetic Neutron Diffractionsupporting

confidence: 71%

“…18 Interestingly, CeCoGe 3 also exhibits unusual magnetic properties with an ordering temperature as high as 21 K 20 and pressure-induced SC (T sc = 0.7 K at 5.5 GPa). 21 Furthermore, the Kondo lattice system CeNiGe 3 , which crystallizes in the orthorhombic space group (Cmmm), orders antiferromagnetically below 5.5 K and exhibits pressureinduced HFSC, showing two domes of SC with a maximum T sc = 0.3 K around 3.5 GPa and 0.4 K around 7 GPa and Fermi liquid behavior at higher pressure. 22,23 To gain insight into the low-temperature physical properties, anisotropy, and strength of hybridization in CeRhGe 3 , the magnetic and thermal properties have been investigated using various experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

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Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

et al. 2012

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The magnetic ground state of CeRhGe 3 has been investigated using magnetic susceptibility, heat capacity, neutron diffraction, muon spin relaxation (µSR), and inelastic neutron scattering (INS) techniques. Our µSR study clearly reveals the presence of two frequencies below T N2 = 7 K and three frequencies between 7 K and T N1 = 14.5 K, indicating long-range magnetic ordering of the Ce 3+ moment. The temperature dependence of the highest frequency follows a mean-field order parameter. Our powder neutron diffraction study at 1.5 K reveals the presence of magnetic Bragg peaks, indexed by the propagation vector k = (0, 0, 3/4) with the Ce 3+ magnetic moment ∼0.45(9) µ B along the c axis. INS studies at 18 K (i.e., above T N1 ) show the presence of two well-defined crystal-field (CEF) excitations at 7.5 and 18 meV. At 10 and 4.5 K, a very small increase has been observed in the CEF excitation energies. At 100 K, both CEF excitations broaden and a broad quasielastic component has also been observed. Further, the low-energy INS study reveals the presence of a nearly temperature-independent quasielastic linewidth between 16 and 60 K, which indicates a Kondo temperature T K = 12.6(3) K. The presence of well-defined CEF excitations in CeRhGe 3 suggests local moment magnetism and may explain the absence of pressure-induced superconductivity. Analyzing the INS data based on a CEF model, we have evaluated the CEF ground-state wave functions and ground-state moment. The observed small value of the ordered moment along the c axis, deduced from the neutron diffraction data, contrasts with the ab-plane moment direction predicted by the single-ion CEF anisotropy and indicates the presence of two-ion anisotropic magnetic exchange interactions, which govern the direction of the moment.

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Section: E Magnetic Neutron Diffractionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

et al. 2012

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“…Among these, CeRhSi 3 [39], CeIrSi 3 [40], CeCoGe 3 [41] and CeIrGe 3 [42] have been found to be pressure-induced superconductors. Single crystals of CeRhSi 3 and CeIrSi 3 , as well as of CeRuSi 3 [43], can be obtained by the Czochralski pulling method in a tetra-arc furnace using a pulling speed of 10 mm/h or 15 mm/h.…”

Section: Crystal Structure and Related Compoundsmentioning

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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“…Studies on NCS have been initially stimulated by the discovery of the coexistence of antiferromagnetic order (T N = 2.2 K) and superconductivity (T c = 0.75 K) for CePt 3 Si [1]. Following this discovery, pressure-induced superconductivity has been reported for the noncentrosymmetric antiferromagnets CeRhSi 3 [3][4][5][6], CeIrSi 3 [5,[7][8][9], CeCoGe 3 [10,11], and CeIrGe 3 [12]. These four cerium-based NCS adopt the body-centred tetragonal BaNiSn 3 -type structure in which the lack of a mirror plane perpendicular to [001] gives rise to the Rashba-type antisymmetric coupling [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…These four cerium-based NCS adopt the body-centred tetragonal BaNiSn 3 -type structure in which the lack of a mirror plane perpendicular to [001] gives rise to the Rashba-type antisymmetric coupling [1,2]. These NCS actually display exotic superconducting behaviour [3][4][5][6][7][8][9][10][11][12] and also show antiferromagnetic ordering in the vicinity of the superconducting state. These four cerium-based NCS belong to the heavy fermion systems, in which complex magnetic superconducting effects may arise from strong correlations among d and f electrons, and thus an unconventional pairing can be assumed which involves spin fluctuations.…”

Section: Introductionmentioning

confidence: 99%

The effect of spin orbit interaction for superconductivity in the noncentrosymmetric superconductor CaIrSi3

Uzunok

İpsara

Tütüncü

et al. 2016

Journal of Alloys and Compounds

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We have carried out an ab initio study of the electronic, vibrational and electronphonon interaction properties of the body-centred tetragonal CaIrSi 3 by employing the density functional theory, a linear-response formalism, and the plane-wave pseudopotential method. The electronic structure and phonon dispersion relations of this material have been analyzed with and without the inclusion of spin-orbit interaction (SOI). Our electron-phonon interaction results reveal that Si-related phonon modes are more involved in the process of scattering of electrons than the remaining phonon modes due to considerable existence of the Si 3p states near the Fermi level. By integrating the Eliashberg spectral function, the average electron-phonon coupling parameter is found to be 0.58 which compares very well with its experimental value of 0.56. Using the calculated value of λ, the superconducting critical temperature (T c ) for CaIrSi 3 is found to be 3.20 K which is in good accordance with its experimental value of 3.55 K. Furthermore, we have shown that the effect of SOI on the values of λ and T c is very small.

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Pressure-induced superconductivity in CeCoGe3 without inversion symmetry

Cited by 108 publications

References 6 publications

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

Muon spin relaxation and neutron scattering investigations of the noncentrosymmetric heavy-fermion antiferromagnet CeRhGe3

Non-centrosymmetric Heavy-Fermion Superconductors

The effect of spin orbit interaction for superconductivity in the noncentrosymmetric superconductor CaIrSi3

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