Neutron diffraction studies on heavy fermion superconducting and antiferromagnetic compounds CeRh1–xCox In5

Ohira‐Kawamura, Seiko; Kawano-Furukawa, Hazuki; Shishido, Hiroaki; Okazaki, Renji; Shibauchi, T.; Harima, Hisatomo; Matsuda, Yuji

doi:10.1002/pssa.200881222

Cited by 5 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is observed for Ir and Co doped CeRhIn 5 for which ordering with k G =(1/2, 1/2, 1/2) (G-type magnetic ordering) is reported either coexisting with or superseding the incommensurate ordering [19][20][21][22]. As concern CeRhIn 5 under pressure, NQR strongly suggests the same G-type commensurate ordering above 1.7 GPa [7].…”

Section: Pacs Numbersmentioning

confidence: 86%

“…A trend in the generic quantum critical (x, P , T ) phase diagram of CeRhIn 5 related compounds is indeed the change from incommensurate to commensurate ordering associated with the appearance of superconductivity. This is observed for Ir and Co doped CeRhIn 5 for which ordering with k G =(1/2, 1/2, 1/2) (G-type magnetic ordering) is reported either coexisting with or superseding the incommensurate ordering [19][20][21][22]. As concern CeRhIn 5 under pressure, NQR strongly suggests the same G-type commensurate ordering above 1.7 GPa [7].…”

mentioning

confidence: 86%

See 1 more Smart Citation

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

et al. 2014

View full text Add to dashboard Cite

We report neutron diffraction experiments performed in the tetragonal antiferromagnetic heavy fermion system CeRhIn5−xSnx in its (x, T ) phase diagram up to the vicinity of the critical concentration xc ≈ 0.40, where long range magnetic order is suppressed. The propagation vector of the magnetic structure is found to be kIC=(1/2, 1/2, k l ) with k l increasing from k l =0.298 to k l =0.410 when x increases from x=0 to x=0.26. Surprisingly, for x=0.30, the order has changed drastically and a commensurate antiferromagnetism with kC=(1/2, 1/2, 0) is found. This concentration is located in the proximity of the quantum critical point where superconductivity is expected.

show abstract

Section: Pacs Numbersmentioning

confidence: 86%

mentioning

confidence: 86%

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

et al. 2014

View full text Add to dashboard Cite

show abstract

“…A diffraction experiment performed on a sample with x=0.4 with T N ≈ 2.9 K and T c ≈ 1.4 K also reveals a commensurate order with k AF [13] while another group reports in this concentration range the coexistence of ordering with k AF and another incommensurate phase with k ′ =(0.5, 0.5, 0.42) [14]. A likely reason for this discrepancy is a sample dependence in relation with slight changes in impurities and defects [15]. For completeness, it should be mentioned that CeRhIn 5 orders with a propagation vector (0.5, 0.5, 0.31) and that the c-axis incommensuration shifts to ≈0.4 in the vicinity of the pressure where superconductivity is induced [16,17].…”

Section: Pacs Numbersmentioning

confidence: 99%

Magnetic Order in Ce_0.95Nd_0.05CoIn₅: The Q-Phase at Zero Magnetic Field

et al. 2014

View full text Add to dashboard Cite

We report neutron scattering experiment results revealing the nature of the magnetic order occurring in the heavy fermion superconductor Ce0.95Nd0.05CoIn5, a case for which an antiferromagnetic state is stabilized at a temperature below the superconducting transition one. We evidence an incommensurate order and its propagation vector is found to be identical to that of the magnetic field induced antiferromagnetic order occurring in the stoichiometric superconductor CeCoIn5, the so-called Q-phase. The commonality between these two cases suggests that superconductivity is a requirement for the formation of this kind of magnetic order and the proposed mechanism is the enhancement of nesting condition by d-wave order parameter with nodes in the nesting area. PACS numbers:The interplay between magnetism and superconductivity is an essential topic whose investigation is common to several families of strongly correlated electron systems: cuprates, iron based superconductors and heavy fermion systems. These systems share the common point that the antiferromagnetic (AFM) ground state can be tuned to a quantum critical point where the Néel temperature, T N , reaches zero as a function of pressure, chemical substitution or magnetic field. At this quantum critical point superconductivity often emerges but there is no paradigm: magnetism and superconductivity can coexist or expel each other depending of each system. In this framework, many investigated systems have a Néel temperature higher than the superconducting transition temperature, T c . The opposite case T N < T c , known for rare earth transition metal borocarbide compounds and Chevrel phases [1], is much less studied in strongly correlated electron systems especially for itinerant electron ones where the same electrons participate to magnetism and superconductivity. This situation arises certainly from the lack of convenient experimental realization of this scenario. Paradoxically a case where it is nonetheless studied is a complex one: the one of magnetic field induced AFM order starting from a superconducting ground state. This case is common to the cuprate La 2−x Sr x CuO 4 , showing both field induced or field enhanced magnetism [2], and to the heavy fermion compounds CeRhIn 5 under pressure and CeCoIn 5 at ambient pressure [3]. This kind of cooperative effect between magnetism and superconductivity reaches its pinnacle in CeCoIn 5 where the field induced AFM phase disappears when superconductivity is suppressed at the upper critical field H c2 .CeCoIn 5 has the highest superconducting transition temperature among Ce heavy fermion compounds (T c = 2.3 K) [4]. It crystallizes in a tetragonal structure (space group P4/mmm) and the superconducting gap symmetry is considered to be the singlet d x2−y2 state [5]. A field induced ordered phase (FIOP) occurs for a magnetic field applied in the basal plane of the tetragonal structure, in a narrow range of temperature and magnetic field below 300 mK and above 10.5 T, the upper critical field being 11.4 T for this geometry...

show abstract

“…Measurements were carried out at T = 1.8 K for Q = (0.5, −0.5, L) from L = 6 to 8, Q = (H, H, 7) from H = 0 to 1.2, Q = (H, H, 6.5) from H = 0 to 1.2 and Q = (H, 0, 6.5) from H = 0 to 1.5. This rules out likely incommensurate propagation vectors similar to those of other incommensurate magnetic phases in Ce-based heavy-fermion compounds, [26][27][28][29][30][31] but we can not exclude the presence of incommensurate modulations propagating elsewhere in reciprocal space. Klimczuk et al, 5 was confirmed by Rietveld refinement using FULLPROF.…”

Section: A Magnetic Resonant X-ray Diffractionmentioning

confidence: 87%

“…In particular, substituting the Co or Ir sites with Rh leads to the coexistence of an incommensurate order with k = ( 1 2 , 1 2 , δ ) and a commensurate order with k = ( 1 2 , 1 2 , 1 2 ) for a range of doping values. [27][28][29][30] It was shown for CeRh 0.7 Ir 0.3 In 5 specifically that the moments lie in the basal plane for both the commensurate and incommensurate orders. Doping the In site with Cd in CeCoIn 5 also stabilizes a commensurate order with k = ( 1 2 , 1 2 , 1 2 ).…”

Section: Discussionmentioning

confidence: 99%

Investigation of the commensurate magnetic structure in the heavy-fermion compound CePt2In7 using magnetic resonant x-ray diffraction

et al. 2017

View full text Add to dashboard Cite

We investigated the magnetic structure of the heavy fermion compound CePt 2 In 7 below T N = 5.34(2) K using magnetic resonant X-ray diffraction at ambient pressure. The magnetic order is characterized by a commensurate propagation vector k 1/2 = 1 2 , 1 2 , 1 2 with spins lying in the basal plane. Our measurements did not reveal the presence of an incommensurate order propagating along the high symmetry directions in reciprocal space but cannot exclude other incommensurate modulations or weak scattering intensities. The observed commensurate order can be described equivalently by either a single-k structure or by a multi-k structure. Furthermore we explain how a commensurate-only ordering may explain the broad distribution of internal fields observed in nuclear quadrupolar resonance experiments (Sakai et al. 2011, Phys. Rev. B 83 140408) that was previously attributed to an incommensurate order. We also report powder X-ray diffraction showing that the crystallographic structure of CePt 2 In 7 changes monotonically with pressure up to P = 7.3 GPa at room temperature. The determined bulk modulus B 0 = 81.1(3) GPa is similar to the ones of the Ce-115 family. Broad diffraction peaks confirm the presence of pronounced strain in polycrystalline samples of CePt 2 In 7 . We discuss how strain effects can lead to different electronic and magnetic properties between polycrystalline and single crystal samples.

show abstract

Neutron diffraction studies on heavy fermion superconducting and antiferromagnetic compounds CeRh_1–xCo_x In₅

Cited by 5 publications

References 30 publications

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

Magnetic Order in Ce_0.95Nd_0.05CoIn₅: The Q-Phase at Zero Magnetic Field

Investigation of the commensurate magnetic structure in the heavy-fermion compound CePt2In7 using magnetic resonant x-ray diffraction

Contact Info

Product

Resources

About

Neutron diffraction studies on heavy fermion superconducting and antiferromagnetic compounds CeRh1–xCox In5

Cited by 5 publications

References 30 publications

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

Magnetic Order in Ce0.95Nd0.05CoIn5: The Q-Phase at Zero Magnetic Field

Investigation of the commensurate magnetic structure in the heavy-fermion compound CePt2In7 using magnetic resonant x-ray diffraction

Contact Info

Product

Resources

About

Neutron diffraction studies on heavy fermion superconducting and antiferromagnetic compounds CeRh_1–xCo_x In₅

Magnetic Order in Ce_0.95Nd_0.05CoIn₅: The Q-Phase at Zero Magnetic Field