Scopus
🔓 Açık Erişim YÖKSİS Eşleşti
Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures
Physical Review B - Condensed Matter and Materials Physics · Eylül 2015
YÖKSİS Kayıtları
Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures
Physical Review B · 2015 SCI-Expanded
DOÇENT TEOMAN ÖZTÜRK →
Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures
Physical Review B · 2015 SCI-Expanded
DOÇENT TEOMAN ÖZTÜRK →
Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures
PHYSICAL REVIEW B · 2015 SCI-Expanded
DOÇENT TEOMAN ÖZTÜRK →
Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures
Physical Review B · 2015 SCI-Expanded
DOÇENT TEOMAN ÖZTÜRK →
Makale Bilgileri
DergiPhysical Review B - Condensed Matter and Materials Physics
Yayın TarihiEylül 2015
Cilt / Sayfa92
Scopus ID2-s2.0-84942465910
Erişim🔓 Açık Erişim
Özet
The recent conjecture of a topologically protected surface state in SmB6 and the verification of robust surface conduction below 4 K have prompted a large effort to understand surface states. Conventional Hall transport measurements allow current to flow on all surfaces of a topological insulator, so such measurements are influenced by contributions from multiple surfaces of varying transport character. Instead, we study magnetotransport of SmB6 using a Corbino geometry, which can directly measure the conductivity of a single, independent surface. Both (011) and (001) crystal surfaces show a strong negative magnetoresistance at all magnetic field angles measured. The (011) surface has a carrier mobility of 122cm2/V·s with a carrier density of 2.5×1013cm-2, which are significantly lower than indicated by Hall transport studies. This mobility value can explain the failure so far to observe Shubnikov-de Haas oscillations. Analysis of the angle dependence of conductivity on the (011) surface suggests a combination of a field-dependent enhancement of the carrier density and a suppression of Kondo scattering from native oxide layer magnetic moments as the likely origin of the negative magnetoresistance. Our results also reveal a hysteretic behavior whose magnitude depends on the magnetic field sweep rate and temperature. Although this feature becomes smaller when the field sweep is slower, it does not disappear or saturate during our slowest sweep-rate measurements, which is much slower than a typical magnetotransport trace. These observations cannot be explained by quantum interference corrections such as weak antilocalization but are more likely due to an extrinsic magnetic effect such as the magnetocaloric effect or glassy ordering.
Yazarlar (15)
1
S. Wolgast
2
Y. S. Eo
3
Teoman Öztürk
4
G. Li
5
Z. Xiang
6
C. Tinsman
7
T. Asaba
8
B. Lawson
9
F. Yu
10
J. W. Allen
11
K. Sun
12
L. Li
13
C. Kurdak
14
D. J. Kim
15
Z. Fisk
Kurumlar
University of California, Irvine
Irvine United States
University of Michigan, Ann Arbor
Ann Arbor United States
Metrikler
39
Atıf
15
Yazar