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The extent of quantum critical fluctuations into the heavy-fermion phase: a neutron scattering study of Ce(Ru1-xFex)(2)Ge-2

The extent of quantum critical fluctuations into the heavy-fermion phase: a neutron scattering study of Ce(Ru1-xFex)(2)Ge-2
The extent of quantum critical fluctuations into the heavy-fermion phase: a neutron scattering study of Ce(Ru1-xFex)(2)Ge-2
We present inelastic neutron scattering measurements on the heavy-fermion compound Ce(Ru1–xFex)2Ge2 (x=0.87). This composition is close to the quantum critical point (QCP) compound (x=0.76) in which it was observed that the decay of spin fluctuations could no longer be described by a simple exponential in time. Here we show that the relaxation mechanism for spin fluctuations exhibits a qualitatively similar momentum and temperature dependence in both compositions, possibly reflecting the underlying scaling law at the QCP. However, the details of the relaxation mechanism demonstrate that critical fluctuations are strongly damped along the composition axis.
0021-8979
10A909-[3pp]
Montfrooij, W.
970851f8-7474-456c-a3bf-794da04c3ae2
Aronson, M.C.
5aa3c95b-2a54-46fb-a423-6a2f15c62ef0
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Mydosh, J.A.
bb2fec63-5365-42f3-9a75-4487f02299d0
Hendrikx, R.
bf72a9ec-820c-49f1-bd48-90ae56b3aacd
Gortenmuller, T.
75740850-9361-4f9f-8a0c-737219793136
Murani, A.P.
1ecc684b-8aec-4c36-93cf-7a584ede1c0a
Haen, P.
8d5eeda2-ca63-4cbc-8bf0-221f80bb6f55
Swainson, I.
b22270e5-b883-4f53-96be-45cd7a54766b
Montfrooij, W.
970851f8-7474-456c-a3bf-794da04c3ae2
Aronson, M.C.
5aa3c95b-2a54-46fb-a423-6a2f15c62ef0
Rainford, B.D.
a57f1153-bbba-49a3-bffc-0d96087156a0
Mydosh, J.A.
bb2fec63-5365-42f3-9a75-4487f02299d0
Hendrikx, R.
bf72a9ec-820c-49f1-bd48-90ae56b3aacd
Gortenmuller, T.
75740850-9361-4f9f-8a0c-737219793136
Murani, A.P.
1ecc684b-8aec-4c36-93cf-7a584ede1c0a
Haen, P.
8d5eeda2-ca63-4cbc-8bf0-221f80bb6f55
Swainson, I.
b22270e5-b883-4f53-96be-45cd7a54766b

Montfrooij, W., Aronson, M.C., Rainford, B.D., Mydosh, J.A., Hendrikx, R., Gortenmuller, T., Murani, A.P., Haen, P. and Swainson, I. (2005) The extent of quantum critical fluctuations into the heavy-fermion phase: a neutron scattering study of Ce(Ru1-xFex)(2)Ge-2. Journal of Applied Physics, 97 (10), 10A909-[3pp]. (doi:10.1063/1.1850338).

Record type: Article

Abstract

We present inelastic neutron scattering measurements on the heavy-fermion compound Ce(Ru1–xFex)2Ge2 (x=0.87). This composition is close to the quantum critical point (QCP) compound (x=0.76) in which it was observed that the decay of spin fluctuations could no longer be described by a simple exponential in time. Here we show that the relaxation mechanism for spin fluctuations exhibits a qualitatively similar momentum and temperature dependence in both compositions, possibly reflecting the underlying scaling law at the QCP. However, the details of the relaxation mechanism demonstrate that critical fluctuations are strongly damped along the composition axis.

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Published date: 2 May 2005

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Local EPrints ID: 57472
URI: http://eprints.soton.ac.uk/id/eprint/57472
ISSN: 0021-8979
PURE UUID: 2c5b92d3-8633-4f2f-8f3c-030b744691d3

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Date deposited: 13 Aug 2008
Last modified: 13 Mar 2019 20:34

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