Contrasting Kondo-Lattice Behavior in CeTSi3and CeTGe3(T=Rh and Ir)

Muro, Yuji; Eom, Duhwa; Takeda, Nobuo; Ishikawa, Masayasu

doi:10.1143/jpsj.67.3601

Cited by 111 publications

(113 citation statements)

References 8 publications

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“…From the jump of the specific heat at T N , the magnetic entropy gain is estimated to be only 12% of R ln 2 [60]. The AFM state is robust against a magnetic field ( Fig.…”

Section: Magnetic Propertiesmentioning

confidence: 97%

“…The tiny entropy gain and the insensitivity to a magnetic field are attributed to the strong Kondo screening of the 4 f electron. The Kondo temperature is estimated to be about 50 K [60]. The magnetic structure at ambient pressure is revealed by neutron experiments to be a longitudinal spin-density-wave (LSDW) type characterized by the propagation vectors Q = (±0.215, 0, 0.5) with polarization along the a * axis [69].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

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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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“…From the jump of the specific heat at T N , the magnetic entropy gain is estimated to be only 12% of R ln 2 [60]. The AFM state is robust against a magnetic field ( Fig.…”

Section: Magnetic Propertiesmentioning

confidence: 97%

Section: Magnetic Propertiesmentioning

confidence: 99%

Non-centrosymmetric Heavy-Fermion Superconductors

Kimura

Bonalde

2012

Non-Centrosymmetric Superconductors

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“…[6][7][8][9] Ce compounds of this series, CeTX 3 (X = Si and Ge), belong to the family of recently discovered noncentrosymmetric HFSC whose superconducting ground-state properties are dictated by an antisymmetric spin-orbit coupling (ASOC) as a consequence of the lack of inversion symmetry, along the [0 0 1] direction, in the tetragonal crystal structure. [10][11][12][13][14][15][16][17][18][19] This ASOC, in turn, results in the formation of a mixed pairing wave function with spin-singlet and spin-triplet components in the superconducting state. The relationship between SC and the lack of inversion symmetry is therefore a central issue, which needs to be clarified both theoretically and experimentally in f-electron systems.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15] The Ge-based compounds CeTGe 3 also exhibit interesting magnetic and superconducting properties. [16][17][18] CeRhGe 3 and CeIrGe 3 exhibit three successive magnetic phase transitions, T N1 = 14.6 K, T N2 = 7 K, T N3 = 0.55 K for CeRhGe 3 and T N1 = 8.7 K, T N2 = 4.7 K, T N = 0.7 K for CeIrGe 3 , respectively. 16,17 T N1 for CeRhGe 3 increases with increasing pressure and reaches a maximum of 21.3 K at 8.0 GPa.…”

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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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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“…The temperature at which S(T ) marks a negative peak is corresponding to the second transition temperature, T N 2 =10K. In the case of electrical resistivity, the anomaly at the first transition temperature (T N 1 =14.6K) is more obvious compared with the second one [4]. However, no distinct anomaly is observed in S(T ) at around 15K (see the inset of Figure 2).…”

Section: Methodsmentioning

confidence: 94%