eprintid: 10120248
rev_number: 18
eprint_status: archive
userid: 608
dir: disk0/10/12/02/48
datestamp: 2021-02-02 17:54:00
lastmod: 2021-09-23 22:28:31
status_changed: 2021-02-02 17:54:00
type: article
metadata_visibility: show
creators_name: Wang, A
creators_name: Nie, ZY
creators_name: Du, F
creators_name: Pang, GM
creators_name: Kase, N
creators_name: Akimitsu, J
creators_name: Chen, Y
creators_name: Gutmann, MJ
creators_name: Adroja, DT
creators_name: Perry, RS
creators_name: Cao, C
creators_name: Smidman, M
creators_name: Yuan, HQ
title: Nodeless superconductivity in Lu5-xRh6Sn18+x with broken time reversal symmetry
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F64
note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: Evidence for broken time reversal symmetry (TRS) has been found in the superconducting states of the 
R
5
Rh
6
Sn
18
 (
R
=
Sc
, Y, Lu) compounds with a centrosymmetric caged crystal structure, but the origin of this phenomenon is unresolved. Here, we report neutron diffraction measurements of single crystals with 
R
=
Lu
, as well as measurements of the temperature dependence of the magnetic penetration depth using a self-induced tunnel-diode-oscillator (TDO)-based technique, together with band structure calculations using density functional theory. Neutron diffraction measurements reveal that the system crystallizes in a tetragonal caged structure, and that one of the nominal Lu sites in the 
Lu
5
Rh
6
Sn
18
 structure is occupied by Sn, yielding a composition 
Lu
5
−
x
Rh
6
Sn
18
+
x
 (
x
=
1
). The low temperature penetration depth shift 
Δ
λ
(
T
)
 exhibits an exponential temperature dependence below around 
0.3
T
c
, giving clear evidence for fully gapped superconductivity. The derived superfluid density is reasonably well accounted for by a single-gap 
s
-wave model, whereas agreement cannot be found for models of TRS breaking states with two-component order parameters. Moreover, band structure calculations reveal multiple bands crossing the Fermi level, and indicate that the aforementioned TRS breaking states would be expected to have nodes on the Fermi surface, in contrast to the observations.
date: 2021-01-01
date_type: published
publisher: AMER PHYSICAL SOC
official_url: https://doi.org/10.1103/PhysRevB.103.024503
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1844221
doi: 10.1103/PhysRevB.103.024503
lyricists_name: Perry, Robin
lyricists_id: RPERR46
actors_name: Perry, Robin
actors_id: RPERR46
actors_role: owner
full_text_status: public
publication: Physical Review B
volume: 103
number: 2
article_number: 024503
pages: 8
citation:        Wang, A;    Nie, ZY;    Du, F;    Pang, GM;    Kase, N;    Akimitsu, J;    Chen, Y;                         ... Yuan, HQ; + view all <#>        Wang, A;  Nie, ZY;  Du, F;  Pang, GM;  Kase, N;  Akimitsu, J;  Chen, Y;  Gutmann, MJ;  Adroja, DT;  Perry, RS;  Cao, C;  Smidman, M;  Yuan, HQ;   - view fewer <#>    (2021)    Nodeless superconductivity in Lu5-xRh6Sn18+x with broken time reversal symmetry.                   Physical Review B , 103  (2)    , Article 024503.  10.1103/PhysRevB.103.024503 <https://doi.org/10.1103/PhysRevB.103.024503>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10120248/1/PhysRevB.103.024503.pdf