Magnetoelastic effects in ErNi2B2C single crystal: probing the H-T phase diagram

Doerr, M.; Rotter, Martin; Massalami, M. El; Sinning, S; Takeya, Hiroyuki; Loewenhaupt, M.

doi:10.1088/0953-8984/14/22/313

Cited by 15 publications

(26 citation statements)

References 17 publications

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“…In the overlaping temperature range our data are consistent with the results of Ref. [16]. At base temperature (1.8 K) features associated with four metamagnetic transitions can be distinguished in the derivative of magnetostriction with respect to magnetic field (Fig.…”

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confidence: 92%

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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confidence: 92%

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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“…It is also interesting to compare the magnitude of this two-ion effect with the one observed in typical single-ion compound such as ErNi 2 B 2 C (Ref. 10 ): for zero field, the saturation value of 100 λ 100 in GdNi 2 B 2 C is ∼-0.5x10 −4 while in ErNi 2 B 2 C is ∼ −3x10 −4 . Fig.10a shows an impressive demonstration of the magnetic domain effects within the ordered state.…”

Section: Magnetostrictionmentioning

confidence: 86%

“…Across the borocarbides, this two-ion orthorhombic distortion should vary roughly with the de Gennes factor and as such for ErNi 2 B 2 C this partial contribution amounts to ǫ γ ≈ −0.4x10 −4 which is one third of the total ǫ γ ≈ −1.4x10 −4 observed for ErNi 2 B 2 C at 2.5 K (Ref. 10 ): thus for borocarbides, the two-ion magnetoelastic contribution (in particular ǫ γ ) is not negligible as compared to that of the single-ion effect. (H)) and 16.5 K (above T R (H)).…”

Section: Magnetostrictionmentioning

confidence: 94%

“…It is the general opinion that the remarkable features observed in these H − T phase diagrams are governed by the combined influence of exchange couplings and crystalline electric field (CEF) interactions 9 : such an approach reproduced successfully the gross features of the magnetic H − T phase diagrams of HoNi 2 B 2 C. Nevertheless, various experimental observations suggest that two additional interactions, namely, anisotropic exchange interaction and magnetoelastic coupling, are necessary ingredients for the understanding of the behavior of the magnetic borocarbides. Magnetoelastic interactions are spectacularly manifested in the onset of a tetragonal-to-orthorhombic distortion at T N for R= Er, Ho, Dy, Tb compounds 10,11,12,13 , while the anisotropic exchange interactions were reported to be necessary for the description of the low-temperature magnetic properties of ErNi 2 B 2 C (Ref. 10 ) and GdNi 2 B 2 C (Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetoelastic interactions are spectacularly manifested in the onset of a tetragonal-to-orthorhombic distortion at T N for R= Er, Ho, Dy, Tb compounds 10,11,12,13 , while the anisotropic exchange interactions were reported to be necessary for the description of the low-temperature magnetic properties of ErNi 2 B 2 C (Ref. 10 ) and GdNi 2 B 2 C (Ref. 14 ).…”

Section: Introductionmentioning

confidence: 99%

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Magnetic phase diagram ofGdNi2B2C:Two-ion magnetoelasticity and anisotropic exchange coupling

et al. 2003

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1 AbstractExtensive magnetization and magnetostriction measurements were carried out on a single crystal of GdNi 2 B 2 C along the main tetragonal axes. Within the paramagnetic phase, the magnetic and strain susceptibilities revealed a weak anisotropy in the exchange couplings and two-ion tetragonal-preserving α-strain modes. Within the ordered phase, magnetization and magnetostriction revealed a relatively strong orthorhombic distortion mode and rich field-temperature phase diagrams. For H //(100) phase diagram, three field-induced transformations were observed, namely, at: H D (T ), related to the domain alignment; H R (T ), associated with reorientation of the moment towards the c-axis; and H S (T ), defining the saturation process wherein the exchange field is completely counterbalanced. On the other hand, For H //(001) phase diagram, only two field-induced transformations were observed, namely at: H R (T ) and H S (T ). For both phase diagrams, H S (T ) follows the relation H S 1 − (T /T N ) 2 1 2 kOe with H S (T → 0)=128.5(5) kOe and T N (H = 0)=19.5 K. In contrast, the thermal evolution of H R (T ) along the c-axis (much simpler than along the a-axis) follows the relation H R [1 − T /T R ] 1 3 kOe where H R (T → 0)=33.5(5) kOe and T R (H = 0)=13.5 K. It is emphasized that the magnetoelastic interaction and the anisotropic exchange coupling are important perturbations and therefore should be explicitly considered if a complete analysis of the magnetic properties of the borocarbides is desired.

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Rare–Earths–Nickel–Boron Compounds

Burzo¹

2023

Rare Earths-Transition Metals-Boron Compounds

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Magnetoelastic effects in ErNi2B2C single crystal: probing the H-T phase diagram

Cited by 15 publications

References 17 publications

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

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

Magnetic phase diagram ofGdNi2B2C:Two-ion magnetoelasticity and anisotropic exchange coupling

Rare–Earths–Nickel–Boron Compounds

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