Nonlocal electrodynamics and low-temperature magnetization of clean high-κ superconductors

Kogan, V. G.; Gurevich, A.; Cho, J. H.; Johnston, D. C.; Xu, Ming; Thompson, James R.; Martynovich, A. Yu.

doi:10.1103/physrevb.54.12386

Cited by 107 publications

(92 citation statements)

References 34 publications

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“…4), according to [32] can have minimum; that is consistent with our data. In [32] the dependence H T 0 0 2 2 2 3 ( ) = F p r was derived for materials with a cylindrical Fermi surface, which is the case for 2H-NbSe 2 (see, e.g., [31]). Unfortunately in our case an exact estimation of H T 0 ( ) is not possible, because of the lack of reliable data on the electron mean free path in our sample.…”

Section: Restrictions Of London Electrodynamics Applicationsupporting

confidence: 81%

“…The situation can be improved at the moment in two ways: 1) using a procedure proposed in [16,17], which is based on the phenomenological Ginzburg-Landau approach and is strictly valid near the upper critical field and in the vicinity of T c , which is not the case here; 2) taking into account the nonlocal correction after the method described in [32]. That is important for estimation of H c2 from magnetization measurements.…”

Section: Restrictions Of London Electrodynamics Applicationmentioning

confidence: 99%

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On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

Sirenko

Makedonska

Shabakayeva

et al. 2002

Low Temperature Physics

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Torque measurements were performed on a high-quality single crystal of the uniaxial superconductor 2H-NbSe 2 in a tilted magnetic field 0-200 kG, in the temperature range 1.5-4.2 K. The transverse component of the absolute magnetization was derived in a magnetic field directed at an angle of 77°to the axis of anisotropy, and its field dependence was analyzed in a reversible domain of the mixed state. The penetration depth and anisotropy characteristics were obtained for the sample under study.

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Section: Restrictions Of London Electrodynamics Applicationsupporting

confidence: 81%

Section: Restrictions Of London Electrodynamics Applicationmentioning

confidence: 99%

On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

Sirenko

Makedonska

Shabakayeva

et al. 2002

Low Temperature Physics

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“…Theoretically, this was studied extensively by Kogan et al, who used nonlocal corrections to the London model to calculate the FLL free energy and thereby determine the stable configuration as a function of the flux line density 24,25,26 . This is the driving force behind the transition between a low-field (distorted) hexagonal and a high-field square FLL seen in the rare-earth nickelborocarbides 16,18 as well as in V 3 Si 27 .…”

Section: Sans Fll Imaging In Cecoin 5 Is Complicated By Two Factors mentioning

confidence: 99%

Hexagonal and Square Flux Line Lattices inCeCoIn5

et al. 2003

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Using small-angle neutron scattering, we have imaged the magnetic flux line lattice (FLL) in the d-wave heavy-fermion superconductor CeCoIn5. At low fields we find a hexagonal FLL. Around 0.6 T this undergoes what is very likely a first-order transition to square symmetry, with the nearest neighbors oriented along the gap node directions. This orientation of the square FLL is consistent with theoretical predictions based on the d-wave order parameter symmetry. 14 . However, in the latter case with an orientation rotated 45• with respect to theoretical predictions 10,11,12,13 . In addition, it is worth pointing out that studies of the FLL symmetry in LSCO as well as in YBa 2 Cu 3 O 7−δ (YBCO) are susceptible to potential complications in interpretation due to the orthorhombic crystal structure, which leads to formaion of twin planes which can pin the FLL 15 . On the other hand, the crystal structure of CeCoIn 5 is tetragonal which excludes twinning, and this material may therefore turn out to be a better example of a "typical" d-wave superconductor.Here we report FLL imaging in CeCoIn 5 , obtained by small-angle neutron scattering (SANS). The FLL undergoes what appears to be a first-order, field driven transition from a hexagonal to a square FLL is observed. A square FLL has not previously been observed in a heavy fermion superconductor, and furthermore this is the first example of a square FLL in a d-wave superconductor oriented with the nearest neighbor directions parallel to the nodal directions of the gap.The SANS experiment was carried out at the D11 small-angle neutron scattering diffractometer at the Institut Laue-Langevin, Grenoble, France. Single crystals of CeCoIn 5 were grown from an excess indium flux 3 , and had a T c = 2.3 K and B c2 (0) = 5.0 T parallel to the c-axis. The sample was composed of four single crystals with thicknesses t = 0.16 − 0.2 mm mounted side by side, each of which was individually aligned. The rather thin samples were necessary, due to the strong absorbtion of low-energy neutrons by In. The total mass of the sample was 36 mg. Incident neutrons with wavelength λ n = 0.6 nm and a wavelength spread ∆λ n /λ n = 10% were used, and the FLL diffraction pattern was collected by a 64 × 64 (1 cm 2 ) position sensitive detector. For all measurements, the sample was field cooled to 50 mK in a dilution refrigerator insert, placed in a cryostat with a superconducting magnet. Magnetic fields in the range 0.3 to 2 T were applied parallel to the crystalline c-axis, and background subtraction was performed using measurements following a zero-field cooling.In Fig. 1 we show FLL diffraction patterns for applied fields of 0.3, 0.6 and 2 T. The images were constructed by summing a number of measurements at different angular positions, in order to satisfy the Bragg condition for the different peaks. A clear evolution of the FLL symmetry and orientation is evident. At the lowest field, twelve peaks are observed evenly distributed on a circle in reciprocal space as shown in Fig. 1(a). This corresponds ...

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“…The borocarbides, in contrast, have intermediate κ values (∼ 10 − 20) that make core effects much smaller. This allows the non-local effects to be introduced perturbatively either in the London model, as done by Kogan, Gurevich et al 19 , or in the Ginzburg-Landau theory, as shown by de Wilde et al 20 and Park and Huse 21 . In both cases, the result is a coupling of the supercurrents to the underlying crystal symmetry.…”

Section: Introductionmentioning

confidence: 99%

On The Influence of a Non-Local Electrodynamics in the Irreversible Magnetization of Non-Magnetic Borocarbides

Silhanek

Civale

Thompson

et al. 2002

New Trends in Superconductivity

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We present an overview of the temperature, field and angular dependence of the irreversible magnetization of non-magnetic borocarbides (Y;Lu)Ni2B2C. We show that nonlocal electrodynamics influences pinning via the unusual behavior of the shear modulus in non-hexagonal lattices. On top of that, we observe that the pinning force density Fp exhibits a rich anisotropic behavior that sharply contrasts with its small mass anisotropy. When H⊥c, Fp is much larger and has a quite different H dependence, indicating that other pinning mechanisms are present.

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Nonlocal electrodynamics and low-temperature magnetization of clean high-κ superconductors

Cited by 107 publications

References 34 publications

On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

On the transverse magnetization of the anisotropic superconductor 2H–NbSe2

Hexagonal and Square Flux Line Lattices inCeCoIn5

On The Influence of a Non-Local Electrodynamics in the Irreversible Magnetization of Non-Magnetic Borocarbides

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