Anisotropic magnetoresistance of single-crystal Ho<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>C and th

Rathnayaka, K. D. D.; Naugle, D. G.; Bk, Cho; Canfield, P. C.

doi:10.1103/physrevb.53.5688

Cited by 107 publications

(85 citation statements)

References 23 publications

(29 reference statements)

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“…However, such a treatment does not agree with the fact that in the Ho compound the a and cmodulations appear and disappear in the same temperature interval. Rathnayaka et al [1] have found an additional phase transition in the same temperature interval. It can be considered as an implicit indication on the independence of these order parameters.…”

mentioning

confidence: 92%

“…The phase boundaries and magnetization in other phases versus magnetic field found in the experiment [2] can be readily explained by assuming that the remaining three phases are as follows: phase 2 -↑↑↓, phase 3 -↑↑→, and the high-field phase 4 -↑. It means that 2 3 of the spins in the phases 2 and 3 are parallel to one of the easy axes whereas the remaining 1 3 is antiparallel and perpendicular, respectively, to the same axis. Note that all metamagnetic phases are stoichiometric in the meaning that the concentrations of spins parallel, antiparallel, or perpendicular to the reference axis are rational numbers.…”

mentioning

confidence: 99%

“…In the works by Rathnayaka et al [1] and by Canfield et al [2] transport and magnetic measurements on HoNi2B2C for various magnetic fields and low temperatures have been reported. The magnetic phase diagram for HoNi2B2C with fields in the a-b plane is of particular interest.…”

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confidence: 99%

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Microscopic model for the magnetic subsystem inHoNi2B2C

Kalatsky

Pokrovsky

1998

Phys. Rev. B

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We demonstrate that the system of localized magnetic moments in HoNi2B2C can be described by the 4-positional clock model. This model, at a proper choice of the coupling constants, yields several metamagnetic phases in magnetic field at zero temperature in full agreement with the experimental phase diagram. The model incorporates couplings between not nearest neighbors in the direction perpendicular to the ferromagnetic planes. The same model leads to a c-modulated magnetic phase near the Curie temperature. The theoretical value of the modulation wave-vector agrees surprisingly well with that observed by the neutron diffraction experiment without new adjustable parameters.In the works by Rathnayaka et al. In this compound easy magnetization axes are identified with crystallographic directions 110 and 110 . The low temperature magnetization data show the existence of 4 metamagnetic phases. The low field phase has been identified by neutron diffraction experiments [3,5] and magnetic measurements [2] with the antiferromagnetic phase, which we denote symbolically ↑↓. The phase boundaries and magnetization in other phases versus magnetic field found in the experiment [2] can be readily explained by assuming that the remaining three phases are as follows: phase 2 -↑↑↓, phase 3 -↑↑→, and the high-field phase 4 -↑. It means that 2 3 of the spins in the phases 2 and 3 are parallel to one of the easy axes whereas the remaining 1 3 is antiparallel and perpendicular, respectively, to the same axis. Note that all metamagnetic phases are stoichiometric in the meaning that the concentrations of spins parallel, antiparallel, or perpendicular to the reference axis are rational numbers. The phase diagram of HoNi2B2C at zero temperature is especially simple if the components of magnetic field Hx, Hy are chosen as variables. The experimental phase diagram of HoNi2B2C is shown in Fig. 1 (in the original work [2] it has been presented in polar coordinates h, θ h ).Siegrist et al.[9] and Huang et al.[6] determined the structure of Lu and Ho 1:2:2:1 compounds as the body-centered tetragonal lattice with the space group I4/mmm. The xray structure analysis and the neutron-scattering experiments performed by Goldman et al. [3,4] and Grigereit et al. [5][6][7]. showed that an incommensurate modulated magnetic structures with the wave-vectors Kc = 0.915c * and Ka = 0.585a * occur in the temperature range 4.7-6 K. At temperatures below 4.7 K they vanish and an antiferromagnetic reflections corresponding to alternating ferromagnetic ab-planes of Ho 3+ localizad moments appear. Though the spacial arrangement of the phases ↑↑↓ and ↑↑→ can not bee directly derived from the magnetization measurements, it is unplausible that the ferromagnetic in-plane interaction changes suddenly by switching on of the magnetic field. Therefore, we believe that our symbols ↑↑↓ and ↑↑→ correspond to the real spatial sequences of in-plane magnetic moments. In this article we present a simple microscopic model for magnetic subsystem in the 1:2:2:1 compound which expl...

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confidence: 99%

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Microscopic model for the magnetic subsystem inHoNi2B2C

Kalatsky

Pokrovsky

1998

Phys. Rev. B

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“…In Fig. 3 we present the PC spectra for different HoNi 2 B 2 C-Ag contacts in the normal state at fields greater than H c2 (0)Ӎ0.55 T but less than 1-2 T at which, judging from the magnetization measurements, 5,6,34 the magnetic order is not yet completely destroyed. There are some variations in the spectral line shapes which are due to the uncontrolled variations of the contact shape, the orientation of the probed crystallite, and the value of the elastic electron mean free path in the contact region, which leads to the different regimes of current flow.…”

Section: Honi 2 B 2 Cmentioning

confidence: 99%

“…Turning to the magnetic field dependence of the spectra, we first note that due to the preferential orientation of the Ho magnetic moments parallel to the ab-plane there is a strong anisotropy in magnetic properties of HoNi 2 B 2 C. 6,34,35 Bearing this in mind, we first describe the influence of the magnetic field H parallel to the direction of easy magnetization, i.e., H ʈ (ab).…”

Section: Honi 2 B 2 Cmentioning

confidence: 99%

Point-contact-spectroscopy evidence of quasi-particle interactions in RNi2B2C (R=Ho, Y)

Yanson

Fisun

Jansen

et al. 1997

Low Temperature Physics

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The point-contact (PC) d2V/dI2-spectra of HoNi2B2C and YNl2B2C reveal structure at applied voltages corresponding to the phonon frequencies. At about 4 meV a maximum is observed in the phonondensity of states by analogy to the soft-phonon structure in neutron scattering experiments for LuNi2B2C [P. Dervenagas et al., Phys. Rev. B52, R9839 (1995)]and YNl2B2C [H. Kawano et al., Czech. J. Phys. 46, S2-825 (1996), Phys. Rev. Lett.77, 4628 (1996)]. In the Ho compound the low-energy phonon peak is suppressed by an applied magnetic field in an anisotropic way, pointing to an interaction between the phonons and the magnetic systems. Surprisingly, in the nonmagnetic Y compound the 4-meV peak is also suppressed by a magnetic field. In the Ho-compound contacts which show the 〈quasi-thermal〉 behavior, the detailed magnetic-field and temperature dependences of PC spectra suggest that the magnetic order is destroyed due to the coupled phonon-magnon subsystem which is driven out of equilibrium by electrons that pass through the contact, by analogy with the nonequilibrium phonon-induced destruction of the superconducting state in point contacts [I. K. Yanson et al., JETP Lett. 45, 543 (1987)]. The PC electron-phonon interaction(EPI) spectral functions are reconstructed and the estimates for the λ-parameter yield the values of the order of 0.1. Comparison with PC EPI spectra of nonsuperconducting and nonmagnetic LaNi2B2C. [I. K. Yanson et al., Phys. Rev. Lett. 78, 935 (1997)], as well as the comparative study of PC EPI and Andreev-reflection spectra for various contacts with superconducting Ho and Y compounds suggest that the low-energy part of the electron-quasi-particle interaction spectral function is responsible for the Cooper pairing in these materials. KeywordsPhonon electron interactions, Phonons, Superconducting compounds, Magnetic fields, Point contacts Disciplines Condensed Matter Physics CommentsThe following article appeared in Low Temperature Physics 23 (1997): 712 and may be found at http://dx.doi.org/10.1063/1.593378. RightsCopyright 1997 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The point-contact ͑PC͒ d 2 V/dI 2 -spectra of HoNi 2 B 2 C and YNl 2 B 2 C reveal structure at applied voltages corresponding to the phonon frequencies. At about 4 meV a maximum is observed in the phonon density of states by analogy to the soft-phonon structure in neutron scattering experiments for LuNi 2 B 2 C ͓P. Dervenagas et al., Phys. Rev. B52, R9839 ͑1995͔͒and YNl 2 B 2 C ͓H. Kawano et al., Czech. J. Phys. 46, S2-825 ͑1996͒, Phys. Rev. Lett. 77, 4628 ͑1996͔͒. In the Ho compound the low-energy phonon peak is suppressed by an applied magnetic field in an anisotropic way, pointing to an interaction between the phonons and the magnetic systems. Surprisingly, in the nonmagnetic Y compound the 4-meV peak is also suppressed by a magnetic field. In the Ho-compound contacts which show the ͗quasi-t...

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Angular anisotropy of the upper critical field in HoNi₂B₂C

Wimbush

Holzäpfel

2006

Phys. Status Solidi (c)

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The behaviour of the upper critical field H c2 of the multiphase magnetically ordering superconductor HoNi 2 B 2 C presents numerous features arising from the three distinct magnetically ordered phases of the material that form at temperatures below the superconducting critical temperature T c , i.e. within the superconducting phase. A detailed investigation of the H c2 of this material in the form of high-quality biaxially textured thin films has been conducted, including the only full set of angle-dependent measurements currently available. The results reveal a number of additional features that have hitherto been overlooked, in particular a far higher degree of anisotropy of the material throughout the entire temperature range below T c than is commonly reported. By correlating these features with the known phase diagrams of the material, an explanation of the observed behaviour can be postulated, and the apparent loss of anisotropy attributed to the transition of the material into a different magnetic phase.

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Anisotropic magnetoresistance of single-crystal HoNi2B2C and th

Cited by 107 publications

References 23 publications

Microscopic model for the magnetic subsystem inHoNi2B2C

Microscopic model for the magnetic subsystem inHoNi2B2C

Point-contact-spectroscopy evidence of quasi-particle interactions in RNi2B2C (R=Ho, Y)

Angular anisotropy of the upper critical field in HoNi₂B₂C

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Anisotropic magnetoresistance of single-crystal HoNi2B2C and th

Cited by 107 publications

References 23 publications

Microscopic model for the magnetic subsystem inHoNi2B2C

Microscopic model for the magnetic subsystem inHoNi2B2C

Point-contact-spectroscopy evidence of quasi-particle interactions in RNi2B2C (R=Ho, Y)

Angular anisotropy of the upper critical field in HoNi2B2C

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Product

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Angular anisotropy of the upper critical field in HoNi₂B₂C