Structural and physical properties of new U-T-Ga compounds (T=Ni, Cu and Pd)

Takabatake, Toshiro; Maeda, Y.; Fujii, H.; Ikeda, S.; Nishigori, S.; Fujita, Toshizo; Minami, Asao; Oguro, I.; Sugiyama, Kiyohiro; Oda, Kenichiro; Date, Muneyuki

doi:10.1016/0921-4526(93)90688-3

Cited by 16 publications

(8 citation statements)

References 7 publications

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“…On the other hand, no uranium-based compound (UT X 3 ) has been fully confirmed to have the BaNiSn 3 -type structure. Only UNiGa 3 , that exhibits AFM order at 39 K, seems to have this structure [53].…”

Section: Crystal Structure and Related Compoundsmentioning

confidence: 97%

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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Section: Crystal Structure and Related Compoundsmentioning

confidence: 97%

Non-centrosymmetric Heavy-Fermion Superconductors

Kimura

Bonalde

2012

Non-Centrosymmetric Superconductors

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“…Only two uranium compounds adopting the tetragonal BaNiSn 3 -type structure are known, namely, UIrSi 3 and UNiGa 3 . Both have been studied in the form of polycrystals only and reported to order antiferromagnetically below 42 K (UIrSi 3 ) 21 and 39 K (UNiGa 3 ) 22 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetism and phase transitions in noncentrosymmetric UIrSi3

et al. 2018

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Magnetization and specific heat measurements on a UIrSi 3 single crystal reveal Ising-like antiferromagnetism below T N = 41.7 K with easy magnetization direction along the c-axis of tetragonal structure. The antiferromagentic ordering is suppressed by magnetic fields > H c (µ 0 H c = 7.3 T at 2 K) applied along the c-axis. The first-order metamagnetic transition at H c exhibits asymmetric hysteresis reflecting a slow reentry of the complex ground-state antiferromagnetic structure with decreasing field. The hysteresis narrows with increasing temperature and vanishes at 28 K. A second-order metamagnetic transition is observed at higher temperatures. The point of change of the order of transition in the established H-T magnetic phase diagram is considered as the tricritical point (at T tc = 28 K and µ 0 H tc = 5.8 T). The modified-Curie-Weiss-law fits of temperature dependence of the a-and c-axis susceptibility provide opposite signs of Weiss temperatures,  p a ~ -51 K and  p c ~ +38 K, respectively. This result and the small value of µ 0 H c contrasting to the high T N indicate competing ferromagnetic and antiferromagnetic interactions responsible for the complex antiferromagnetic ground state. The simultaneous electronic-structure calculations focused on the total energy of ferromagentic and various antiferromagnetic states, the U magnetic moment and magnetocrystalline anisotropy provide results consistent with experimental findings and the suggested physical picture of the system.

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“…For this compound, the strong magnetic anisotropy found in single-crystal studies can be taken as a further argument against a spin-glass state. On the other hand, the observation of high y-values in all U(Cu, A1) 5 compounds discussed here as well as in other U ternaries containing Cu, e.g., U(Cu, Ga) 5 [8] and U(Cu, AI)12 [9], may indicate that some other mechanism is responsible for the common enhancement of c/T in Cu-containing U ternaries. For x < 3.1, the onset of magnetic ordering is manifest in the occurrence of maxima in the temperature dependence of the magnetic susceptibility at slightly higher temperatures than those found in the specific-heat measurements.…”

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confidence: 80%