The spin polarization of CrO2 revisited

Yates, K. A.; Branford, W. R.; Magnus, Fridrik; Miyoshi, Yasuyuki; Morris, B.; Cohen, L. F.; Sousa, Paulo; Conde, O.; Silvestre, A. J.

doi:10.1063/1.2801693

Cited by 30 publications

(56 citation statements)

References 28 publications

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“…[12][13][14][15] The mechanism behind the effect is the process of triplet Andreev reflection at the half-metal-superconductor interface. 2,4 The key ingredient that allows and influences this reflection process is provided by the magnetic properties of the interface between the half metal and the superconductor: it should have a magnetization that is misaligned from that of the half metal.…”

Section: Introductionmentioning

confidence: 99%

Dephasing-enabled triplet Andreev conductance

Béri

2009

Phys. Rev. B

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We study the conductance of normal-superconducting quantum dots with strong spin-orbit scattering, coupled to a source reservoir using a single-mode spin-filtering quantum point contact. The choice of the system is guided by the aim to study triplet Andreev reflection without relying on half metallic materials with specific interface properties. Focusing on the zero temperature, zero-bias regime, we show how dephasing due to the presence of a voltage probe enables the conductance, which vanishes in the quantum limit, to take nonzero values. Concentrating on chaotic quantum dots, we obtain the full distribution of the conductance as a function of the dephasing rate. As dephasing gradually lifts the conductance from zero, the dependence of the conductance fluctuations on the dephasing rate is nonmonotonic. This is in contrast to chaotic quantum dots in usual transport situations, where dephasing monotonically suppresses the conductance fluctuations.Comment: 6 pages, 3 figure

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Section: Introductionmentioning

confidence: 99%

Dephasing-enabled triplet Andreev conductance

Béri

2009

Phys. Rev. B

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“…A number of experimental reports have shown possible signatures of the LRSTPE [38][39][40] , although it remains to be determined what the 'signature' of the LRSTPE is in the Andreev reflection spectra. It is clear, however, from both theoretical and experimental works that if the LRSTPE can be reliably turned 'on' and 'off', changes should be observed in the parameters used to fit the spectra that indicate the subgap conductance, i.e.…”

Section: Discussionmentioning

confidence: 99%

Evidence for spin mixing in holmium thin film and crystal samples

et al. 2011

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In a number of recent experiments, holmium has been shown to promote spin triplet pairing when in proximity to a spin singlet superconductor. The condition for the support of spin triplet pairing is that the ferromagnet should have an inhomogeneous magnetic state at the interface with the superconductor. Here we use Andreev reflection spectroscopy to study the properties of single ferromagnet/superconductor interfaces formed of holmium and niobium, as a function of the contact resistance of the junction between them. We find that both single crystal and c-axis oriented thin film holmium show unusual behavior for low junction contact resistance, characteristic of spin mixing type properties, which are thought necessary to underpin spin triplet formation. We also explore whether this signature is observed when the junction is formed of Ni 19 Pd 81 and niobium.

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“…16 The grain size measured by XRD increased with deposition temperature from 33nm at 330°C to 80nm at 380°C. 16 Films grown by this method have been extensively characterized [15][16][17][18] , point contact Andreev reflection measurements on the 595, 251 and 62nm films in this study were published previously, 17 confirming bulk spin polarisation of the transport carriers (P t ) close to 100% and no strong correlation with morphology.…”

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confidence: 79%

Coexistence of Universal and Topological Anomalous Hall Effects in MetalCrO2Thin Films in the Dirty Limit

et al. 2009

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The scaling exponent of 1.6 between anomalous Hall and longitudinal conductivity, characteristic of the universal Hall mechanism in dirty-metal ferromagnets, emerges from a series of CrO 2 films as we systematically increase structural disorder. Magnetic disorder in CrO 2 increases with temperature and this drives a separate topological Hall mechanism. We find that these terms are controlled discretely by structural and magnetic defect populations, and their coexistence leads to apparent divergence from exponent 1.6, suggesting that the universal term is more prevalent than previously realised.

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The spin polarization of CrO2 revisited

Cited by 30 publications

References 28 publications

Dephasing-enabled triplet Andreev conductance

Dephasing-enabled triplet Andreev conductance

Evidence for spin mixing in holmium thin film and crystal samples

Coexistence of Universal and Topological Anomalous Hall Effects in MetalCrO2Thin Films in the Dirty Limit

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