Microscopic changes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">HoNi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><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:mi mathvariant="normal">C</mml:mi></mml:math>due to thermal treatment and its effect on superconductivity

Dertinger, A.; Dinnebiér, Robert E.; Kreyßig, A.; Stephens, Peter W.; Pagola, Silvina; Loewenhaupt, M.; Smaalen, Sander van; Braun, H. F.

doi:10.1103/physrevb.63.184518

Cited by 12 publications

(4 citation statements)

References 26 publications

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“…Additionally, high-resolution electron microscopy indicated significant concentrations of stacking faults modifying the local composition (see homologues series and synthesis sections above). The same might hold true for all discussed borocarbides, since dependencies of physical properties on thermal history of the samples was frequently discussed [61][62][63][112][113][114][115]. For example, some unit cell parameter dependences on B and C contents in HoNi 2 [B 2 C] in agreement with further investigation techniques demonstrate an at least small homogeneity range within these two constituents with deviations from ideal composition leading to disappearance of superconductivity [116].…”

Section: Crystal Structure Detailssupporting

confidence: 53%

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

Niewa¹,

Shlyk²,

Blaschkowski

2011

Zeitschrift Für Kristallographie

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Abstract. Few years after the discovery of superconductivity in high-T c cuprates, borocarbides and shortly after nitridoborates with reasonably high T c s up to about 23 K attracted considerable attention. Particularly for the rareearth metal series with composition RNi 2 [B 2 C] it turned out, that several members exhibit superconductivity next to magnetic order with both T c above or below the magnetic ordering temperature. Therefore, these compounds have been regarded as ideal materials to study the interplay and coexistence of superconductivity and long range magnetic order, due to their comparably high ordering temperatures and similar magnetic and superconducting condensation energies. This review gathers information on the series

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Section: Crystal Structure Detailssupporting

confidence: 53%

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

Niewa¹,

Shlyk²,

Blaschkowski

2011

Zeitschrift Für Kristallographie

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“…Point-contact studies of Rybaltchenko et al (1999) revealed that the superconducting order parameter satisfied the BCS theory only below 5.5-5.8 K, whereas at higher temperatures an anomalous superconducting state is observed. Investigating HoNi 2 B 2 C, one has to consider that between T N and T c the magnetic and superconducting properties are very sensitive to details of the preparation procedure and to small deviations from the ideal stoichiometry (Wagner et al (1999), Dertinger and Braun (2000), Alleno et al (2001); see also section 4.8.3).…”

Section: Honi 2 B 2 Cmentioning

confidence: 99%

Interaction of superconductivity and magnetism in borocarbide superconductors

2001

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The interaction of rare-earth magnetism and superconductivity has been a topic of interest for many years. In classical magnetic superconductors (Chevrel phases, ternary rhodium borides, etc) as well as in the high-T c cuprates the superconducting state usually coexists with antiferromagnetic order on the rare-earth sublattice. In these compounds the magnetic ordering temperature T N is much below the superconducting transition temperature T c . The discovery of superconducting borocarbides RT 2 B 2 C with R = Sc, Y, La, Th, Dy, Ho, Er, Tm or Lu and T = Ni, Ru, Pd or Pt (where not all of these combinations of R and T result in superconductivity) has reanimated the research on the coexistence of superconductivity and magnetic order. Most of these borocarbides crystallize in the tetragonal LuNi 2 B 2 C type structure which is an interstitial modification of the ThCr 2 Si 2 type. Contrary to the behaviour of Cu in the cuprates Ni does not carry a magnetic moment in the borocarbides. Various types of antiferromagnetic structures on the rare-earth sublattice have been found to coexist with superconductivity in RNi 2 B 2 C for R = Tm, Er, Ho and Dy. Particularly of interest is the case of HoNi 2 B 2 C for which three different types of antiferromagnetic structures have been observed: (i) a commensurate one with Ho moments aligned ferromagnetically within layers perpendicular to the tetragonal c axis where consecutive layers are aligned in opposite directions, (ii) an incommensurate spiral along the c axis and (iii) an incommensurate a-axismodulated structure with a modulation vector τ ≈ (0.55, 0, 0). This wave vector emerges in various RNi 2 B 2 C compounds with magnetic as well as nonmagnetic R elements and is connected with Fermi surface nesting. Both incommensurate magnetization structures have been shown to be related to the near-reentrant behaviour observed in HoNi 2 B 2 C whereas the commensurate structure coexists well with the superconducting state in this compound. The variation of T N and T c with the de Gennes factor can roughly be drawn on straight lines from Lu to Gd and from Lu to Tb, respectively, with the exception of Yb. Consequently, T c > T N holds for Tm, Er, Ho and T c < T N for Dy. However, the study of various pseudoquaternary (R, R )Ni 2 B 2 C compounds has shown that this so-called de Gennes scaling is not universal for the borocarbides and it breaks down in some cases, which is attributed to effects of details

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“…It has been suggested that the lowtemperature physical properties of polycrystalline HoNi 2 B 2 C depend on thermal treatment as well as chemical composition while the properties of single crystals are relatively less affected. 15,16 Even though majority of measurements indicate the presence of T* at 5.5 K, thermodynamic measurements on single crystals that show the magnetic transition to be a truly bulk property are rare.…”

Section: Introductionmentioning

confidence: 98%

Specific heat study of the magnetic superconductorHoNi2B2C

et al. 2004

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The complex magnetic transitions and superconductivity of HoNi 2 B 2 C were studied via the dependence of the heat capacity on temperature and in-plane field angle. We provide an extended, comprehensive magnetic phase diagram for Bʈ͓100͔ and Bʈ͓110͔ based on the thermodynamic measurements. Three magnetic transitions and the superconducting transition were clearly observed. The 5.2 K transition (T N ) shows a hysteresis with temperature, indicating the first-order nature of the transition at Bϭ0 T. The 6 K transition T M , namely the onset of the long-range ordering, displays a dramatic in-plane anisotropy: T M increases with increasing magnetic field for Bʈ͓100͔ while it decreases with increasing field for Bʈ͓110͔. The anomalous anisotropy in T M indicates that the transition is related to the a-axis spiral structure. The 5.5 K transition T* shows similar behavior to the 5.2 K transition, i.e., a small in-plane anisotropy and scaling with Ising model. This last transition is ascribed to the change from a* dominant phase to c* dominant phase.

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Microscopic changes inHoNi2B2Cdue to thermal treatment and its effect on superconductivity

Cited by 12 publications

References 26 publications

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

Rare-earth metal transition metal borocarbide and nitridoborate superconductors

Interaction of superconductivity and magnetism in borocarbide superconductors

Specific heat study of the magnetic superconductorHoNi2B2C

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