Wohlleben effect in YRh4B4

Abstract

The Wohlleben effect (a positive response in the temperature dependence of the magnetization in the superconducting state during FC measurements) is observed in the superconductor YRh 4 B 4 in a magnetic field H ¼ 10 Oe for the first time. The positive response disappears in a field of 20 Oe and a diamagnetic response develops and increases as the magnetic field is raised. V C 2013 AIP Publishing LLC. [http://dx.

Paramagnetic magnetization signals and curious metastable behaviour in field-cooled magnetization of a single crystal of superconductor 2H-NbSe2

“…The observation of an anomalous paramagnetic magnetization signal (viz., paramagnetic Meissner effect (PME)), instead of the usual diamagnetic behaviour, on field-cooling a superconducting specimen, continues to attract [1,2] attention ever since its discovery [3] in ceramic sample(s) of a high T c cuprate. In addition to high T c cuprates [3][4][5][6][7][8][9][10][11][12], the PME-like attribute is known to occur in a wide variety of other superconductors [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Numerous explanations (see [27] for a review), e.g.…”

“…In addition to high T c cuprates [3][4][5][6][7][8][9][10][11][12], the PME-like attribute is known to occur in a wide variety of other superconductors [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. Numerous explanations (see Ref.…”

Anisotropy of electric resistance and upper critical field in magnetic superconductor Dy0.6Y0.4Rh3.85Ru0.15B4

“…Measurements of the specific heat of Dy 0.8 Y 0.2 Rh 4 B 4 (T M = 30.5 K, T c = 5.9 K) indicate emergence of another magnetic phase transition below 2.7 K [3]. Recently, anomalies of some physical quantities, unusual for systems with conventional superconductivity, were discovered in Dy 1−x Y x Rh 4 B 4 : the paramagnetic Meissner effect [4,5] and non-monotonic temperature dependencies of the upper critical magnetic field H c2 and the superconducting gap [3,6,7].…”