Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Freeman, PG"'
Polarized and unpolarized neutron inelastic scattering has been used to measure the spin excitations in the spin-charge-ordered stripe phase of La5/3Sr1/3NiO4. At high energies, sharp magnetic modes are observed characteristic of a static stripe latt
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f163788d166242d39222847a5aa79305
https://ora.ox.ac.uk/objects/uuid:fcd4e6c2-99e4-444a-a611-cf51cfe778b1
https://ora.ox.ac.uk/objects/uuid:fcd4e6c2-99e4-444a-a611-cf51cfe778b1
Autor:
Woo, HJ, Boothroyd, AT, Nakajima, K, Perring, TG, Frost, CD, Freeman, PG, Prabhakaran, D, Yamada, K, Tranquada, JM
Using the MAPS spectrometer at the ISIS spallation source, we have measured the magnetic excitations of single-crystal samples of stripe-ordered La2-x Srx Ni O4 with x=0.333 and 0.275. The full two-dimensional spin-wave dispersions were obtained usin
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https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::81923abb9b533fb4577f17e167ce024b
https://ora.ox.ac.uk/objects/uuid:ceb817d9-9b92-4489-9521-fab876781458
https://ora.ox.ac.uk/objects/uuid:ceb817d9-9b92-4489-9521-fab876781458
The spin ordering of La3/2Sr1/2NiO4 was investigated by magnetization measurements, and by unpolarized- and polarized-neutron diffraction. Spin ordering with an incommensurability epsilon ~ 0.445 is observed below T_so ~ 80 K. On cooling, a spin reor
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::334835adbf9f8a57c78010a26d1ad320
https://ora.ox.ac.uk/objects/uuid:2672a0f5-f78b-43c1-92e2-9aa8b532a3fe
https://ora.ox.ac.uk/objects/uuid:2672a0f5-f78b-43c1-92e2-9aa8b532a3fe
The incommensurate magnetic excitations of spin-charge ordered La2NiO4.11 were studied by inelastic neutron scattering. With increasing energy up to similar to 20meV the maximum intensity of the spin excitations is observed to shift slightly towards
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https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::42adfc89aa52e73ef3b09dacda8a04a3
https://doi.org/10.1016/j.jmmm.2006.10.488
https://doi.org/10.1016/j.jmmm.2006.10.488
Autor:
Lancaster, T, Giblin, SR, Allodi, G, Bordignon, S, Mazzani, M, De Renzi, R, Freeman, PG, Baker, PJ, Pratt, FL, Babkevich, P, Blundell, SJ, Boothroyd, AT, Moeller, JS, Prabhakaran, D
Publikováno v:
Physical review B, 2014, Vol.89(2), pp.020405(R) [Peer Reviewed Journal]
We report on an investigation into the dynamics of the stripe phase of La5/3Sr1/3CoO4, a material recently shown to have an hour-glass magnetic excitation spectrum. A combination of magnetic susceptibility, muon-spin relaxation and nuclear magnetic r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e480d5f9861485ff54ceb01df22c5aaf
http://arxiv.org/abs/1301.5124
http://arxiv.org/abs/1301.5124
Autor:
KUMAR, R, SHEPTYAKOV, D, KHUNTIA, P, ROLFS, K, FREEMAN, PG, RONNOW, HM, DEY, T, BAENITZ, M, MAHAJAN, AV
Publikováno v:
PHYSICAL REVIEW B
We report the structural and magnetic properties of the 4d (M = Rh) based and 5d ( M = Ir) based systems Ba3MxTi3-xO9 ( nominally x = 0.5, 1). The studied compositions were found to crystallize in a hexagonal structure with the centrosymmetric space
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::c296caa64903a50a29564b600f430bea
Autor:
Freeman, PG, Prabhakaran, D, Nakajima, K, Stunault, A, Enderle, M, Niedermayer, C, Yamada, K, Boothroyd, AT
The low energy spin excitations of La(2-x)Sr(x)NiO(4), x = 0.275 and 1/3, have been investigated by unpolarized- and polarized-inelastic neutron scattering from single crystals. A pattern of magnetic diffuse scattering is observed in both composition
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::321de6121dfa1b1aa24a781df3099a63
Autor:
Helme, LM, Boothroyd, AT, Coldea, R, Prabhakaran, D, Frost, CD, Keen, DA, Regnault, LP, Freeman, PG, Enderle, M, Kulda, J
We describe neutron scattering experiments performed to investigate the magnetic order and dynamics of half-doped La1.5Sr0.5CoO4. This layered perovskite exhibits a near-ideal checkerboard pattern of Co2+/Co3+ charge order at temperatures below ~ 800
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6238baf386924117747a6ce539e2a99
http://arxiv.org/abs/0909.4964
http://arxiv.org/abs/0909.4964
We have studied the magnetization of a series of spin-charge ordered La(2-x)Sr(x)NiO(4+delta) single crystals with 0 < x < 0.5. For fields applied parallel to the ab plane there is a large irreversibility below a temperature T(F1) ~ 50 K and a smalle
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=arXiv_dedup_::ec9382ffe5d3cd1c2ba3136179c209ee
http://arxiv.org/abs/cond-mat/0509085
http://arxiv.org/abs/cond-mat/0509085
Autor:
Boothroyd, AT, Freeman, PG, Prabhakaran, D, Woo, H, Nakajima, K, Tranquada, JM, Yamada, K, Frost, CD
We report neutron scattering measurements of the spectrum of magnetic excitations in the stripe-ordered phase of La2-xSrxNiO4 (x=0.275 and 1/3). The propagating spin excitations follow a similar dispersion relation for the two compositions, but the l
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d2dc4fe4c14372f9425158dc5272b95