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Ghosh, K.; Ramakrishnan, S.; Dhar, S. K.; Malik, S.K.; Chandra, Girish; Pecharsky, V. K.; Gschneidner, K. A.; Hu, Zhibing; Yelon, W. B.

doi:10.1103/physrevb.52.7267

Cited by 50 publications

(34 citation statements)

References 16 publications

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“…33) CeRuGe 3 is reported to have the orthorhombic structure 34) or to have the cubic structure. 35) Lastly we give a brief comment on La-113 compounds. Several La-113 compounds like LaRhSi 3 , LaIrSi 3 , and LaPdSi 3 , show the superconductivity with T c of 1.9, 2.7, and 2.6 K, respectively.…”

Section: Crystal Structure and Related Compoundsmentioning

confidence: 99%

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi₃

2007

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We review the normal and superconducting properties in the noncentrosymmetric heavy-fermion CeRhSi 3 . In the normal state, CeRhSi 3 exhibits the antiferromagnetic order at low temperatures (1.6 K at ambient pressure) although its Kondo temperature is much higher than the ordering temperature T N . With applying pressure P, T N initially increases and subsequently decreases. The superconductivity arises at the pressures where the antiferromagnetic transition occurs. T N does not seem to fall to zero but becomes nearly constant with further application of pressure, and then T N vs P merges with the superconducting transition temperature T c vs P at 26 kbar where T c reaches the maximum. Nearly perfect magneticshielding associated with the superconductivity is observed below 26 kbar, suggesting that the bulk superconductivity is realized below T N . We observe an anomaly below T c in the resistivity as well as in the ac-susceptibility. The origin of the both anomalies seem to be the same but have not been clarified. The magnetic field-temperature (H-T) phase diagram of the superconducting state for fields along the tetragonal a-axis is unusual. It has a concave structure and the upper-critical-field H c2 at zero temperature exceeds the paramagnetic limiting field expected from the BCS model. The pressure dependence of H-T phase diagram implies that the paramagnetic effect exists and the effect is much reduced in CeRhSi 3 . This result is consistent with the theoretical prediction for the noncentrosymmetric superconductor.

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Section: Crystal Structure and Related Compoundsmentioning

confidence: 99%

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi₃

2007

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“…2 Later, a different composition and a cubic Yb 3 Rh 4 Sn 13 -type structure were suggested for this phase, 10 the latter with some crystallographic disorder between Ce and Ge atoms. 11 For the cubic phase, antiferromagnetism below T N ϭ4.2 K was anticipated from the electrical resistivity data, though the temperature dependence of the magnetization suggests rather ferromagnetism or spin-glass behavior below about 8 K. 10 In turn, in the orthorhombic derivative antiferromagnetic ordering was reported to set in at T N ϭ7.6 K. 12 Surprisingly, our recent ac susceptibility measurements have not confirmed that value for orthorhombic CeNiGe 3 , rather a transition occurs at T N ϭ5.5 K. 13 This finding motivated us to undertake a comprehensive re-investigation of the compound in order to clarify controversies on its crystal structure and magnetic behavior. In this paper we report the results of magnetization, ac and dc magnetic susceptibility, electrical resistivity, magnetoresistivity, Hall effect, and specific-heat measurements, all performed on polycrystalline specimens of orthorhombic CeNiGe 3 .…”

Section: Introductionmentioning

confidence: 97%

Kondo behavior in antiferromagneticCeNiGe3

et al. 2003

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CeNiGe 3 , crystallizing in the orthorhombic SmNiGe 3 -type crystal structure, was studied by means of dc and ac magnetic susceptibility, magnetization, electrical resistivity, magnetoresistivity, Hall effect, and specific-heat measurements. The compound orders antiferromagnetically at T N ϭ5.5 K due to the presence of well localized 4 f magnetic moments, which are partly screened via a Kondo-like mechanism. The electrical behavior is governed by an interplay of Ruderman-Kittel-Kasuya-Yosida and Kondo interactions modified by crystal-field effects. The Kondo temperature is of similar magnitude as T N , and the overall crystal electric field splitting is of the order of 160 K. The low-temperature specific heat exhibits some enhancement indicating the formation of moderate-heavy quasiparticles in the antiferromagnetic state. The specific variation with applied magnetic field of the main physical characteristics of CeNiGe 3 points at a complex magnetic structure of the compound in the ordered region.

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“…In particular, CeCuAl 3 and CeAuAl 3 are suggested to be HF compounds with AFM ground states [46] and have the potential to become non-centrosymmetric HF superconductors. There are at least two CeT X 3 compounds that do not have the BaNiSn 3 -type crystal lattice: CeNiGe 3 , which has an orthorhombic structure and exhibits superconductivity under pressure [50], and CeRuGe 3 , which is reported to have either orthorhombic [51] or cubic structure [52].…”

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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Crystal structures and low-temperature behaviors of the heavy-fermion compoundsCeRuGe3andCe3

Cited by 50 publications

References 16 publications

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi₃

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi₃

Kondo behavior in antiferromagneticCeNiGe3

Non-centrosymmetric Heavy-Fermion Superconductors

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Crystal structures and low-temperature behaviors of the heavy-fermion compoundsCeRuGe3andCe3

Cited by 50 publications

References 16 publications

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi3

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi3

Kondo behavior in antiferromagneticCeNiGe3

Non-centrosymmetric Heavy-Fermion Superconductors

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Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi₃

Normal and Superconducting Properties of Noncentrosymmetric Heavy Fermion CeRhSi₃