Magnetic properties of single crystals of

Isikawa, Yosikazu; Kato, Daiki; Mitsuda, Akihiro; Mizushima, T.; Kuwai, Tomohiko

doi:10.1016/j.jmmm.2003.12.1021

Cited by 22 publications

(21 citation statements)

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“…6), it is suspected that, like CeRhIn 5 , magnetic correlations are what shape this anomalous scattering rate. In Ce 1−x Gd x CoIn 5 , this must involve a Ruderman-Kittel-Kasuya-Yosida (RKKY)-type exchange, as demonstrated by both a linear increase with x of the effective moment (up to µ eff = 7.0 µ B at x = 1) and long-range antiferromagnetic order (T N 32 K at x = 1), which is in line with the proportionality between T N and D J found in other magnetic RCoIn 5 compounds 30 . But what is the underlying property of Gd 3+ magnetism that is amenable to T-linear scattering?…”

Section: Letterssupporting

confidence: 79%

Incoherent non-Fermi-liquid scattering in a Kondo lattice

Paglione

Sayles

et al. 2007

Nature Phys

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One of the most notorious non-Fermi-liquid properties of both archetypal heavy-fermion systems 1-4 and the high-T c copper oxide superconductors 5 is an electrical resistivity that evolves linearly (rather than quadratically) with temperature, T . In the heavy-fermion superconductor CeCoIn 5 (ref. 6), this linear behaviour was one of the first indications of the presence of a zero-temperature instability, or quantum critical point. Here, we report the observation of a unique control parameter of T -linear scattering in CeCoIn 5 , found through systematic chemical substitutions of both magnetic and non-magnetic rareearth, R, ions into the Ce sublattice. We find that the evolution of inelastic scattering in Ce 1−x R x CoIn 5 is strongly dependent on the f -electron configuration of the R ion, whereas two other key properties-Cooper-pair breaking and Kondo-lattice coherence-are not. Thus, T -linear resistivity in CeCoIn 5 is intimately related to the nature of incoherent scattering centres in the Kondo lattice, which provides insight into the anomalous scattering rate synonymous with quantum criticality 7 . Although recent theories 4,[8][9][10] provide possible routes to an explanation of T-linear resistivity-found in both f -electron systems (for example, Y 1−x U x Pd 3 (ref. [1][2][3][4]6 , its coexistence with conventional (T 2 ) Hall-angle scattering 11,12 and its inconsistency with oneparameter scaling 13 . Most recently, its observation over three decades of T at the field-tuned quantum critical point (QCP) of CeCoIn 5 has been linked to a violation of the Wiedemann-Franz law 14 , an indication that this scattering rate is associated with the failure of Fermi-liquid theory in its most basic form.Here, we present a rigorous study of the effects of rare-earth substitution on three closely related features of the exotic metal CeCoIn 5 : unconventional superconductivity, Kondo-lattice coherence and anomalous charge-carrier scattering. By diluting the Ce lattice within high-quality single-crystal specimens of Ce 1−x R x CoIn 5 with both non-magnetic (full or empty 4f -shell) and stable-4f -moment substituent ions of varying size and electronic configuration, we are able to inject both 'Kondo holes' (isoelectronic ions without magnetic moments) and strongly localized magnetic moments into the coherent Kondo lattice. This has allowed us to probe the spin exchange between the Ce 3+ localized magnetic moments and the spins of the conduction electrons involved in Cooper pairing, Kondo screening and anomalous transport in a controlled way, revealing a surprising contrast between the response of coherent phenomena and non-Fermi-liquid behaviour to this perturbation. Figure 1 shows the evolution of both the superconducting transition temperature T c (identified by the transition in resistivity, ρ) and Kondo-lattice coherence temperature T coh (identified by the maximum in ρ(T )) for all rare-earth substitutions made in Ce 1−x R x CoIn 5 through the complete range of concentrations where both features exist. As shown, the...

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Section: Letterssupporting

confidence: 79%

Incoherent non-Fermi-liquid scattering in a Kondo lattice

Paglione

Sayles

et al. 2007

Nature Phys

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“…Above this field the Devil staircase continues by steps at ∼ 8, 9, 11, 15 and 20 T. The saturated magnetic moment (at 30 T) is about 9.5 µ B /f.u. which is in a good agreement with the value for the free Tb 3+ ion [8,9]. The basal-plane susceptibility at low temperatures is much higher than the c-axis one which provokes conclusions about the easy magnetization axis perpendicular to c. However we believe that the magnetic structure in this compound consists of c-axis magnetic moments coupled in a complex antiferromagnetic stacking along c. When the magnetic field is applied in the perpendicular direction the Tb magnetic moment turn towards the field direction producing large basal-plane susceptibility.…”

Section: Resultssupporting

confidence: 88%

“…In CeCoIn 5 [1] a field-induced metamagnetic transition has been observed in the magnetic field applied parallel to the (110) direction of the tetragonal structure. This transition appears at 1.4 K and persists to at least 25 K. As a complementary case to the Kondo-like behavior of CeCoIn 5 , a series of RECoIn 5 (R = Tb, Dy, Ho, Er, Yb) compounds has been studied by Isikawa et al [8] and a very interesting magnetic behavior with low temperature antiferromagnetism has been observed by magnetization measurements for all compounds except Yb, which remains nonmagnetic. In this paper we focus our interest on specific-heat in comparison with magnetization behavior.…”

Section: Introductionmentioning

confidence: 93%

Complex High-field Magnetic Behavior of TbCoIn5 Single-crystal

Prokleška¹,

Vejpravová²,

Sechovský³

et al. 2004

Czech J Phys

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A single-crystal of TbCoIn5 has been grown by the flux technique and studied by means of specific heat and magnetization measurements in wide ranges of temperature and magnetic field. The obtained results can be conceived with antiferromagnetic ordering below TN = 30 K. Anomalies observed in specific heat data clearly manifest the existence of two (or three) magnetic phases appearing consecutively with decreasing temperature in a narrow temperature interval below TN. New anomalies indicating new emerging magnetic phases are generated when applying magnetic field higher than 4 T along the c-axis (apparently the easy magnetization axis) . Characteristic temperatures of anomalies are gradually decreasing with increasing field. This evolution B-T of the magnetic-phase space and also the observed low-temperature Devil staircase magnetization curve in fields applied along c reflect a complex hierarchy of exchange interactions in TbCoIn5.PACS : 75.50.Ee, 75.30.Kz

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“…For a given rare earth, the Rh and Ir based compounds have similar Néel tem- [7], d= [8], e= [9], f = [10], g= [4], h= [11], i= [12], j= [13], k= [14], l= [15], m= [16], n= [5], p= [17], q= [18], and r= [2].…”

Section: 5mentioning

confidence: 99%

Why the Co-based 115 compounds are different: The case study ofGdMIn5(M=Co,Rh,Ir
Facio
¹
,
Betancourth
²
,
Pedrazzini
³

et al. 2015
Phys. Rev. B
15
0
14
0
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The discovery in 2001 of superconductivity in some heavy fermion compounds of the RMIn5 (R=4f or 5f elements, M=Co, Rh, Ir) family, has triggered enormous amount of research pointing to understand the physical origin of superconductivity and its relation with magnetism. Although many properties have been clarified, there are still crutial questions that remain unanswered. One of these questions is the particular role of the transition metal in determining the value of critical superconducting temperature (Tc). In this work, we analyse an interesting regularity that is experimentally observed in this family of compounds, where the lowest Néel temperatures are obtained in the Co-based materials. We focus our analysis on the GdMIn5 compounds and perform density-functional-theory based total-energy calculations to obtain the parameters for the exchange coupling interactions between the magnetic moments located at the Gd 3+ ions. Our calculations indicate that the ground state of the three compounds is a C-type antiferromagnet determined by the competition between the first-and second-neighbor exchange couplings inside GdIn3 planes and stabilized by the couplings across MIn2 planes. We then solve a model with these magnetic interactions using a mean-field approximation and Quantum Monte Carlo simulations. The results obtained for the calculated Néel and Curie-Weiss temperatures, the specific heat and the magnetic susceptibility are in very good agreement with the existent experimental data. Remarkably, we show that the first neighbor interplane exchange coupling in the Co-based material is much smaller than in the Rh and Ir analogues due to a more two dimensional behaviour in the former. This result explains the observed lower Néel temperature in Co-115 systems and may shed light on the fact that the Co-based 115 superconductors present the highest Tc. I. INTRODUCTIONThe family of compounds RMIn 5 (M=Co, Rh, Ir), where R is a rare earth, presents a rich variety of electronic and magnetic properties ranging from heavy fermion behavior and anomalous superconductivity to complex magnetic states. These properties are closely related to the strong correlations on the R 4f electrons and to the quasi two-dimensionality of the Fermi surface. These materials crystallize in a tetragonal structure that can be viewed as alternating MIn 2 and RIn 3 planes stacked along the c-axis (see Fig. 1), where the role of the transition metal M connecting the RIn 3 planes is central to determine the stability of the low temperature phase.The most puzzling features occur in the Ce-based compounds which present heavy fermion behavior at T 20 K. Correlation effects induce an enhancement of the electronic specific heat coefficient up to 1000mJ/mol K 2 for CeCoIn 5 which is an ambient pressure superconductor below T C = 2.3K.1 CeIrIn 5 has its superconducting transition at T C = 0.4K while CeRhIn 5 is an antiferromagnet at ambient pressure with a Néel temperature T N = 3.8K.2 For P > P cr = 1.77GP a the antiferromagnetic state of CeRhIn 5 is rep...

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Magnetic properties of single crystals of

Cited by 22 publications

References 4 publications

Incoherent non-Fermi-liquid scattering in a Kondo lattice

Incoherent non-Fermi-liquid scattering in a Kondo lattice

Complex High-field Magnetic Behavior of TbCoIn5 Single-crystal

Why the Co-based 115 compounds are different: The case study ofGdMIn5(M=Co,Rh,Ir
Facio
¹
,
Betancourth
²
,
Pedrazzini
³

et al. 2015
Phys. Rev. B
15
0
14
0
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Magnetic properties of single crystals of

Cited by 22 publications

References 4 publications

Incoherent non-Fermi-liquid scattering in a Kondo lattice

Incoherent non-Fermi-liquid scattering in a Kondo lattice

Complex High-field Magnetic Behavior of TbCoIn5 Single-crystal

Why the Co-based 115 compounds are different: The case study ofGdMIn5(M=Co,Rh,IrFacio1, Betancourth2, Pedrazzini3 et al. 2015Phys. Rev. B150140View full textAdd to dashboardCite

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Why the Co-based 115 compounds are different: The case study ofGdMIn5(M=Co,Rh,Ir
Facio
¹
,
Betancourth
²
,
Pedrazzini
³

et al. 2015
Phys. Rev. B
15
0
14
0
View full text Add to dashboard Cite