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Temperature dependentY NMR study on multiferroic YCrO.
J Phys Condens Matter
January 2021
School of Physical Sciences, Jawaharlal Nehru University, New Delhi - 110067, India.
In this manuscript, we report theY NMR measurement as a function of temperature on single phase and pure polycrystalline YCrOsample to study the magnetism and relaxation times on a microscopic level across the magnetic transition (≃ 141 K) from paramagnetic to antiferromagnetic state. The NMR peak width broadens abruptly upon crossingdue to the onset of internal magnetic fields, while peakshift slight decreases. A slight increase and subsequent anomalous decrease in the NMR peak intensity is observed on approachingfrom 300 K.
View Article and Find Full Text PDFConstraints on the superconducting order parameter in SrRuO from oxygen-17 nuclear magnetic resonance.
Nature
October 2019
Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, CA, USA.
Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite SrRuO is considered to be the only solid-state analogue to the superfluid He-A phase, with an odd-parity order parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected 'split' transition in a SrRuO crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed.
View Article and Find Full Text PDFScanning nuclear resonance imaging of a hyperfine-coupled quantum Hall system.
Nat Commun
June 2018
Graduate School of Sciences, Tohoku University, Sendai, 980-8578, Japan.
Nuclear resonance (NR) is widely used to detect and characterise nuclear spin polarisation and conduction electron spin polarisation coupled by a hyperfine interaction. While the macroscopic aspects of such hyperfine-coupled systems have been addressed in most relevant studies, the essential role of local variation in both types of spin polarisation has been indicated in 2D semiconductor systems. In this study, we apply a recently developed local and highly sensitive NR based on a scanning probe to a hyperfine-coupled quantum Hall (QH) system in a 2D electron gas subject to a strong magnetic field.
View Article and Find Full Text PDFPressure Induced Stripe-Order Antiferromagnetism and First-Order Phase Transition in FeSe.
Phys Rev Lett
December 2016
Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China.
To elucidate the magnetic structure and the origin of the nematicity in FeSe, we perform a high-pressure ^{77}Se NMR study on FeSe single crystals. We find a suppression of the structural transition temperature with pressure up to about 2 GPa from the anisotropy of the Knight shift. Above 2 GPa, a stripe-order antiferromagnetism that breaks the spatial fourfold rotational symmetry is determined by the NMR spectra under different field orientations and with temperatures down to 50 mK.
View Article and Find Full Text PDFComparative NMR studies on Ca3LiRuO6 and Ca3NaRuO6.
J Phys Condens Matter
June 2016
Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India.
We report a comparative study of two ruthanate compounds, Ca3LiRuO6 and Ca3NaRuO6 by magnetic measurements, heat capacity and NMR. Ca3LiRuO6 is a weak ferromagnet with a magnetic ordering temperature of 115 K. The (7)Li NMR linewidth of Ca3LiRuO6 displays a broad shoulder above the magnetic ordering temperature.
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