Comment on “Vortex Glass and Lattice Melting Transitions in a YN<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">i</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:

Sridhar, S.; Oxx, S.; Willemsen, Balam A.; Srikanth, H.; Choudhury, Durga P.

doi:10.1103/physrevlett.77.2145

Cited by 3 publications

(2 citation statements)

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“…The oscillator is ultra-stable, (approximately 1 Hz in 4 MHz), and this leads to very high sensitivity, with typical resolutions of a fewÅ. Earlier experiments in cuprate superconductors have led to a wide variety of information regarding superconducting parameters such as the lower critical field H c1 and pinning forces κ P [12] and have also been recently used to study borocarbide superconductors where they have revealed new features in the H-T phase diagram [13,14]. The primary advantage of our technique is the ability to probe both the resistivity in the normal state and superfluid density in the superconducting state which is not possible with conventional techniques such as DC resistivity or AC susceptibility.…”

Section: A Rf Setupmentioning

confidence: 99%

“…Magnetic fields upto 70 kOe were applied using a superconducting magnet. This experimental technique has been extensively used to study high and low T c superconductors both in the Meissner and mixed states [12][13][14]. If either the skin depth δ or the superconducting penetration depth λ changes as functions of T or H, these changes can be measured as changes ∆f in resonant frequency using ∆(δ or λ) = −G ∆f , where G is a geometric factor.…”

Section: A Rf Setupmentioning

confidence: 99%

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Magnetoelectrodynamics at high frequencies in the antiferromagnetic and superconducting states ofDyNi2B2C

et al. 1998

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We report the observation of novel behaviour in the radio frequency (rf ) and microwave response of DyNi2B2C over a wide range of temperature (T ) and magnetic field (H) in the antiferromagnetic (AFM) and superconducting (SC) states. At microwave frequencies of 10 GHz, the T dependence of the surface impedance Zs = Rs + iXs was measured which yields the T dependence of the complex conductivity σ1 − iσ2 in the SC and AFM states. At radio frequencies (4 MHz), the H and T dependence of the penetration depth λ(T, H) were measured.The establishment of antiferromagnetic order at TN = 10.3 K results in a marked decrease in the scattering of charge carriers, leading to sharp decreases in Rs and Xs. However, Rs and Xs differ from each other in the AFM state. We show that the results are consistent with conductivity relaxation whence the scattering rate becomes comparable to the microwave frequency.The rf measurements yield a rich dependence of the scattering on the magnetic field near and below TN . Anomalous decrease of scattering at moderate applied fields is observed at temperatures near and above TN , and arises due to a crossover from a negative magnetoresistance state, possibly associated with a loss of spin disorder scattering at low fields, to a positive magnetoresistance state associated with the metallic nature. The normal state magnetoresistance is positive at all temperatures for µ0H > 2T and at all fields for T > 15K. Several characteristic field and temperature scales associated with metamagnetic transitions (HM1(T ), HM2(T )) and onset of spin disorder HD(T ), in addition to Tc, TN and Hc2(T ) are observed in the rf measurements.74.25. Ha, 74.25.Nf, 74.72.Ny, 75.20.Hr, 75.40.Gb, 75.50.Ee, 75.90.+w

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Section: A Rf Setupmentioning

confidence: 99%

Section: A Rf Setupmentioning

confidence: 99%