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Sinha, Sunil K.; Lynn, J. W.; Grigereit, T. E.; Hossain, Zakir; Gupta, L. C.; Nagarajan, R.; Godart, C.

doi:10.1103/physrevb.51.681

Cited by 164 publications

(99 citation statements)

References 2 publications

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“…[12]). This is quite surprising, taking into account that among these compounds, there is a nonmagnetic one (Y-compound) and crystals with quite different magnetic order (Er- [20,21], Ho- [5,6], Dy-compounds [22]). The necessity of taking "low" T * c = T N 6.5 K for Ho-for this ∆ 0 (T c )-law is proved by the fact that all the other magnetic superconductors have the magnetic structure, yielding antiferromagetic compensation on the Ni planes, while the misalignment of the adjacent ferromagnetic planes in HoNi 2 B 2 C at 6.5 ≤ T ≤ 8.5 K destroys the antiferromagnetic compensation on the Ni 2 B 2 layers.…”

Section: Discussionmentioning

confidence: 99%

Point-contact spectroscopy of superconducting energy gap in DyNi2B2C

Yanson

Bobrov

Tomy

et al. 2000

Physica C: Superconductivity

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The superconducting energy gap in DyNi2B2C has been investigated using a point-contact technique based on the Andreev reflection from a normal (N)-superconductor (S) boundary, where N is Ag. The observed differential resistance dV /dI is well described by the Blonder-Tinkham-Klapwijk (BTK) theory based on the BSC density of states with zero broadening parameter. Typically, the intensity of the gap structure amounts to several percentage of the normal state resistance, which is an order of magnitude less than predicted by the theory. For DyNi2B2C with Tc < TN (the Neel temperature), we found gap values satisfying the ratio of 2∆0/kBTc = 3.63 ± 0.05 similar to other superconducting nickel-borocarbides, both nonmagnetic and magnetic with Tc ≥ TN . The superconducting gap nonlinearity is superimposed on the antiferromagnetic structure in dV /dI(V ) which is suppressed at the magnetic field of the order of 3T applied nominally in the ab-plane and temperature ≥ 11 K. The observed superconducting properties depend on the exact composition and structure at the surface of the crystal.

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Section: Discussionmentioning

confidence: 99%

Point-contact spectroscopy of superconducting energy gap in DyNi2B2C

Yanson

Bobrov

Tomy

et al. 2000

Physica C: Superconductivity

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“…(A similar model relevant to ErNi 2 B 2 C would involve S 1,a,y and S 1,b,x since the spin-density wave in this material is transversely polarized. [6])…”

Section: The Spin-density-wave Phasementioning

confidence: 99%

“…[6,7,8,9] The study of the weak ferromagnetism is made more complicated in this case because the magnetic transitions occur within a superconducting phase. Here also a lockin phase transition appears to accompany the transition to weak ferromagnetism.…”

Section: Introductionmentioning

confidence: 99%

Transition to weak ferromagnetism inTbNi2B2Cand
Walker
¹
,
Detlefs
²

2003
Phys. Rev. B
8
1
4
0
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“…De, 74.70.Dd, 75.30.Kz, 75.40.Cx, 75.80.+q Quaternary borocarbides, in particular the members of the RNi 2 B 2 C (R = Gd-Lu, Y) series of compounds, exhibit a plethora of complex phenomena: co-existence of local moment magnetism and superconductivity, non-locality and flux line lattice transitions, heavy fermion physics and intricate metamagnetism [1,2,3,4]. ErNi 2 B 2 C superconducts below ∼ 10 K [5,6], below T N ≈ 6 K superconductivity coexists with an incommensurate antiferromagnetic state with the ordering wave vector q ≈ 0.55 a * [8,9,7], and then, on further cooling, a weak ferromagnetic component develops below T W F M ≈ 2.3 K [10,11,12].Despite a large number of publications on physical properties of ErNi 2 B 2 C, few of them address temperature dependent structural changes in the material. The evolution of the lattice parameters between 360 K and 90 K, as measured by single crystal X-ray diffraction, was reported in Ref.…”

mentioning

confidence: 99%

Anisotropic thermal expansion and evaluation of uniaxial pressure dependence of superconducting and magnetic transitions in ErNi2B2C

Bud’ko¹,

Schmiedeshoff²,

Canfield³

2006

Solid State Communications

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We present anisotropic thermal expansion measurements on single crystalline ErNi 2 B 2 C. All three, superconducting, antiferromagnetic and weak ferromagnetic phase transitions are unambiguously distinguished in the data. Anisotropic uniaxial pressure dependencies of the transitions are estimated based on the Ehrenfest relation, leading to a conclusion, in particular, that weak ferromagnetic state will be suppressed by small, order of several kbar, hydrostatic pressure.Key words: A. magnetically ordered materials, A. superconductors, D. thermal expansion PACS: 65.40. De, 74.70.Dd, 75.30.Kz, 75.40.Cx, 75.80.+q Quaternary borocarbides, in particular the members of the RNi 2 B 2 C (R = Gd-Lu, Y) series of compounds, exhibit a plethora of complex phenomena: co-existence of local moment magnetism and superconductivity, non-locality and flux line lattice transitions, heavy fermion physics and intricate metamagnetism [1,2,3,4]. ErNi 2 B 2 C superconducts below ∼ 10 K [5,6], below T N ≈ 6 K superconductivity coexists with an incommensurate antiferromagnetic state with the ordering wave vector q ≈ 0.55 a * [8,9,7], and then, on further cooling, a weak ferromagnetic component develops below T W F M ≈ 2.3 K [10,11,12].Despite a large number of publications on physical properties of ErNi 2 B 2 C, few of them address temperature dependent structural changes in the material. The evolution of the lattice parameters between 360 K and 90 K, as measured by single crystal X-ray diffraction, was reported in Ref. [13]. A magnetoelastic tetragonal-to-orthorhombic structural distortion was observed [14] below T N by synchrotron X-ray scattering. A λ-type anomaly in thermal expansion at In this publication we report high resolution, anisotropic (c-axis and a-axis) thermal expansion (TE) and longitudinal, low temperature, magnetostriction (MS) measurements for H a on single crystalline ErNi 2 B 2 C. These measurements were performed with the intent to study the anomalies in TE associated with all three salient transition temperatures (to the best of our knowledge, for two of them, T c and T W F M , no TE anomalies were reported so far) and to evaluate the uniaxial pressure derivatives of the three transition temperatures using the the thermodynamic Ehrenfest relation.Plate-like single crystals of ErNi 2 B 2 C with the c-axis perpendicular to the plates were grown by a Ni 2 B high temperature flux method (see Refs. [1,7,17,18] for more details). For the TE/MS measurements the ErNi 2 B 2 C crystal was shaped into a nearly rectangular bar, with two pairs of parallel surfaces, so that the measurements were performed along [100] (L = 2.23 mm) and [001] (L = 1.42 mm) directions. After shaping, the sample was annealed in dynamic vacuum (10 −5 − 10 −6 Torr) at 950• C for ∼ 100 hours [19]. Thermal expansion and magnetostriction were measured using a capacitive dilatometer constructed of OFHC copper; a detailed description of the dilatometer will appear elsewhere [20]. The dilatometer was mounted in a Quantum Design PPMS-14 instrumen...

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Neutron-diffraction study of antiferromagnetic order in the magnetic superconductorErNi2B2

Cited by 164 publications

References 2 publications

Point-contact spectroscopy of superconducting energy gap in DyNi2B2C

Point-contact spectroscopy of superconducting energy gap in DyNi2B2C

Transition to weak ferromagnetism inTbNi2B2Cand
Walker
¹
,
Detlefs
²

2003
Phys. Rev. B
8
1
4
0
View full text Add to dashboard Cite

Anisotropic thermal expansion and evaluation of uniaxial pressure dependence of superconducting and magnetic transitions in ErNi2B2C

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Neutron-diffraction study of antiferromagnetic order in the magnetic superconductorErNi2B2

Cited by 164 publications

References 2 publications

Point-contact spectroscopy of superconducting energy gap in DyNi2B2C

Point-contact spectroscopy of superconducting energy gap in DyNi2B2C

Transition to weak ferromagnetism inTbNi2B2CandWalker1, Detlefs2 2003Phys. Rev. B8140View full textAdd to dashboardCite

Anisotropic thermal expansion and evaluation of uniaxial pressure dependence of superconducting and magnetic transitions in ErNi2B2C

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Resources

About

Transition to weak ferromagnetism inTbNi2B2Cand
Walker
¹
,
Detlefs
²

2003
Phys. Rev. B
8
1
4
0
View full text Add to dashboard Cite